Merge tag 'gpio-v5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO changes for the v5.9 kernel cycle.

  There is nothing too exciting in it, but a new macro that fixes a
  build failure on a minor ARM32 platform that appeared yesterday is
  part of it so we better merge it.

  Core changes:

   - Introduce the for_each_requested_gpio() macro to help in dependent
     code all over the place. Also patch a few locations to use it while
     we are at it.

   - Split out the sysfs code into its own file.

   - Split out the character device code into its own file, then make a
     set of refactorings and improvements to this code. We are setting
     the stage to revamp the userspace API a bit in the next cycle.

   - Fix a whole slew of kerneldoc that was wrong or missing.

  New drivers:

   - The PCA953x driver now supports the PCAL9535.

  Driver improvements:

   - A host of incremental modernizations and improvements to the
     PCA953x driver.

   - Incremental improvements to the Xilinx Zynq driver.

   - Some improvements to the GPIO aggregator driver.

   - I ran all over the place switching all threaded and other drivers
     requesting their own IRQ while using the core GPIO IRQ helpers to
     pass the GPIO irq chip as a template instead of calling the
     explicit set-up functions. Next merge window we may retire the old
     code altogether"

* tag 'gpio-v5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (97 commits)
  gpio: wcove: Request IRQ after all initialisation done
  gpio: crystalcove: Free IRQ on error path
  gpio: pca953x: Request IRQ after all initialisation done
  gpio: don't use same lockdep class for all devm_gpiochip_add_data users
  gpio: max732x: Use irqchip template
  gpio: stmpe: Move chip registration
  gpio: rcar: Use irqchip template
  gpio: regmap: fix type clash
  gpio: Correct kernel-doc inconsistency
  gpio: pci-idio-16: Use irqchip template
  gpio: pcie-idio-24: Use irqchip template
  gpio: 104-idio-16: Use irqchip template
  gpio: 104-idi-48: Use irqchip template
  gpio: 104-dio-48e: Use irqchip template
  gpio: ws16c48: Use irqchip template
  gpio: omap: improve coding style for pin config flags
  gpio: dln2: Use irqchip template
  gpio: sch: Add a blank line between declaration and code
  gpio: sch: changed every 'unsigned' to 'unsigned int'
  gpio: ich: changed every 'unsigned' to 'unsigned int'
  ...

Documentation/devicetree/bindings/gpio/gpio-pca953x.txt

@@ -19,6 +19,7 @@ Required properties:
 	nxp,pca9698
 	nxp,pcal6416
 	nxp,pcal6524
+	nxp,pcal9535
 	nxp,pcal9555a
 	maxim,max7310
 	maxim,max7312

Documentation/devicetree/bindings/gpio/gpio-pca9570.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/gpio-pca9570.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: PCA9570 I2C GPO expander
+
+maintainers:
+  - Sungbo Eo <mans0n@gorani.run>
+
+properties:
+  compatible:
+    enum:
+      - nxp,pca9570
+
+  reg:
+    maxItems: 1
+
+  gpio-controller: true
+
+  '#gpio-cells':
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - gpio-controller
+  - "#gpio-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        gpio@24 {
+            compatible = "nxp,pca9570";
+            reg = <0x24>;
+            gpio-controller;
+            #gpio-cells = <2>;
+        };
+    };
+
+...

Documentation/devicetree/bindings/gpio/gpio-zynq.txt

@@ -6,7 +6,9 @@ Required properties:
 			  - First cell is the GPIO line number
 			  - Second cell is used to specify optional
 			    parameters (unused)
-- compatible		: Should be "xlnx,zynq-gpio-1.0" or "xlnx,zynqmp-gpio-1.0"
+- compatible		: Should be "xlnx,zynq-gpio-1.0" or
+			  "xlnx,zynqmp-gpio-1.0" or "xlnx,versal-gpio-1.0
+			  or "xlnx,pmc-gpio-1.0
 - clocks		: Clock specifier (see clock bindings for details)
 - gpio-controller	: Marks the device node as a GPIO controller.
 - interrupts		: Interrupt specifier (see interrupt bindings for

Documentation/driver-api/gpio/drivers-on-gpio.rst

@@ -89,6 +89,13 @@ hardware descriptions such as device tree or ACPI:
   Consumer Electronics Control bus using only GPIO. It is used to communicate
   with devices on the HDMI bus.
 
+- gpio-charger: drivers/power/supply/gpio-charger.c is used if you need to do
+  battery charging and all you have to go by to check the presence of the
+  AC charger or more complex tasks such as indicating charging status using
+  nothing but GPIO lines, this driver provides that and also a clearly defined
+  way to pass the charging parameters from hardware descriptions such as the
+  device tree.
+
 Apart from this there are special GPIO drivers in subsystems like MMC/SD to
 read card detect and write protect GPIO lines, and in the TTY serial subsystem
 to emulate MCTRL (modem control) signals CTS/RTS by using two GPIO lines. The

drivers/gpio/Kconfig

@@ -410,7 +410,7 @@ config GPIO_MXS
 
 config GPIO_OCTEON
 	tristate "Cavium OCTEON GPIO"
-	depends on GPIOLIB && CAVIUM_OCTEON_SOC
+	depends on CAVIUM_OCTEON_SOC
 	default y
 	help
 	  Say yes here to support the on-chip GPIO lines on the OCTEON
@@ -962,6 +962,14 @@ config GPIO_PCA953X_IRQ
 	  Say yes here to enable the pca953x to be used as an interrupt
 	  controller. It requires the driver to be built in the kernel.
 
+config GPIO_PCA9570
+	tristate "PCA9570 4-Bit I2C GPO expander"
+	help
+	  Say yes here to enable the GPO driver for the NXP PCA9570 chip.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called gpio-pca9570.
+
 config GPIO_PCF857X
 	tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
 	select GPIOLIB_IRQCHIP
@@ -1117,7 +1125,7 @@ config GPIO_DLN2
 
 config HTC_EGPIO
 	bool "HTC EGPIO support"
-	depends on GPIOLIB && ARM
+	depends on ARM
 	help
 	  This driver supports the CPLD egpio chip present on
 	  several HTC phones.  It provides basic support for input

drivers/gpio/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_GPIOLIB)		+= gpiolib.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib-devres.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib-legacy.o
 obj-$(CONFIG_GPIOLIB)		+= gpiolib-devprop.o
+obj-$(CONFIG_GPIOLIB)		+= gpiolib-cdev.o
 obj-$(CONFIG_OF_GPIO)		+= gpiolib-of.o
 obj-$(CONFIG_GPIO_SYSFS)	+= gpiolib-sysfs.o
 obj-$(CONFIG_GPIO_ACPI)		+= gpiolib-acpi.o
@@ -110,6 +111,7 @@ obj-$(CONFIG_GPIO_OCTEON)		+= gpio-octeon.o
 obj-$(CONFIG_GPIO_OMAP)			+= gpio-omap.o
 obj-$(CONFIG_GPIO_PALMAS)		+= gpio-palmas.o
 obj-$(CONFIG_GPIO_PCA953X)		+= gpio-pca953x.o
+obj-$(CONFIG_GPIO_PCA9570)		+= gpio-pca9570.o
 obj-$(CONFIG_GPIO_PCF857X)		+= gpio-pcf857x.o
 obj-$(CONFIG_GPIO_PCH)			+= gpio-pch.o
 obj-$(CONFIG_GPIO_PCIE_IDIO_24)		+= gpio-pcie-idio-24.o

drivers/gpio/TODO

@@ -5,7 +5,7 @@ subsystem.
 GPIO descriptors
 
 Starting with commit 79a9becda894 the GPIO subsystem embarked on a journey
-to move away from the global GPIO numberspace and toward a decriptor-based
+to move away from the global GPIO numberspace and toward a descriptor-based
 approach. This means that GPIO consumers, drivers and machine descriptions
 ideally have no use or idea of the global GPIO numberspace that has/was
 used in the inception of the GPIO subsystem.

drivers/gpio/gpio-104-dio-48e.c

@@ -368,10 +368,21 @@ static const char *dio48e_names[DIO48E_NGPIO] = {
 	"PPI Group 1 Port C 5", "PPI Group 1 Port C 6", "PPI Group 1 Port C 7"
 };
 
+static int dio48e_irq_init_hw(struct gpio_chip *gc)
+{
+	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(gc);
+
+	/* Disable IRQ by default */
+	inb(dio48egpio->base + 0xB);
+
+	return 0;
+}
+
 static int dio48e_probe(struct device *dev, unsigned int id)
 {
 	struct dio48e_gpio *dio48egpio;
 	const char *const name = dev_name(dev);
+	struct gpio_irq_chip *girq;
 	int err;
 
 	dio48egpio = devm_kzalloc(dev, sizeof(*dio48egpio), GFP_KERNEL);
@@ -399,13 +410,17 @@ static int dio48e_probe(struct device *dev, unsigned int id)
 	dio48egpio->chip.set_multiple = dio48e_gpio_set_multiple;
 	dio48egpio->base = base[id];
 
-	raw_spin_lock_init(&dio48egpio->lock);
+	girq = &dio48egpio->chip.irq;
+	girq->chip = &dio48e_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_edge_irq;
+	girq->init_hw = dio48e_irq_init_hw;
 
-	err = devm_gpiochip_add_data(dev, &dio48egpio->chip, dio48egpio);
-	if (err) {
-		dev_err(dev, "GPIO registering failed (%d)\n", err);
-		return err;
-	}
+	raw_spin_lock_init(&dio48egpio->lock);
 
 	/* initialize all GPIO as output */
 	outb(0x80, base[id] + 3);
@@ -419,13 +434,9 @@ static int dio48e_probe(struct device *dev, unsigned int id)
 	outb(0x00, base[id] + 6);
 	outb(0x00, base[id] + 7);
 
-	/* disable IRQ by default */
-	inb(base[id] + 0xB);
-
-	err = gpiochip_irqchip_add(&dio48egpio->chip, &dio48e_irqchip, 0,
-		handle_edge_irq, IRQ_TYPE_NONE);
+	err = devm_gpiochip_add_data(dev, &dio48egpio->chip, dio48egpio);
 	if (err) {
-		dev_err(dev, "Could not add irqchip (%d)\n", err);
+		dev_err(dev, "GPIO registering failed (%d)\n", err);
 		return err;
 	}
 

drivers/gpio/gpio-104-idi-48.c

@@ -247,10 +247,22 @@ static const char *idi48_names[IDI48_NGPIO] = {
 	"Bit 18 B", "Bit 19 B", "Bit 20 B", "Bit 21 B", "Bit 22 B", "Bit 23 B"
 };
 
+static int idi_48_irq_init_hw(struct gpio_chip *gc)
+{
+	struct idi_48_gpio *const idi48gpio = gpiochip_get_data(gc);
+
+	/* Disable IRQ by default */
+	outb(0, idi48gpio->base + 7);
+	inb(idi48gpio->base + 7);
+
+	return 0;
+}
+
 static int idi_48_probe(struct device *dev, unsigned int id)
 {
 	struct idi_48_gpio *idi48gpio;
 	const char *const name = dev_name(dev);
+	struct gpio_irq_chip *girq;
 	int err;
 
 	idi48gpio = devm_kzalloc(dev, sizeof(*idi48gpio), GFP_KERNEL);
@@ -275,6 +287,16 @@ static int idi_48_probe(struct device *dev, unsigned int id)
 	idi48gpio->chip.get_multiple = idi_48_gpio_get_multiple;
 	idi48gpio->base = base[id];
 
+	girq = &idi48gpio->chip.irq;
+	girq->chip = &idi_48_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_edge_irq;
+	girq->init_hw = idi_48_irq_init_hw;
+
 	raw_spin_lock_init(&idi48gpio->lock);
 	spin_lock_init(&idi48gpio->ack_lock);
 
@@ -284,17 +306,6 @@ static int idi_48_probe(struct device *dev, unsigned int id)
 		return err;
 	}
 
-	/* Disable IRQ by default */
-	outb(0, base[id] + 7);
-	inb(base[id] + 7);
-
-	err = gpiochip_irqchip_add(&idi48gpio->chip, &idi_48_irqchip, 0,
-		handle_edge_irq, IRQ_TYPE_NONE);
-	if (err) {
-		dev_err(dev, "Could not add irqchip (%d)\n", err);
-		return err;
-	}
-
 	err = devm_request_irq(dev, irq[id], idi_48_irq_handler, IRQF_SHARED,
 		name, idi48gpio);
 	if (err) {

drivers/gpio/gpio-104-idio-16.c

@@ -224,10 +224,22 @@ static const char *idio_16_names[IDIO_16_NGPIO] = {
 	"IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15"
 };
 
+static int idio_16_irq_init_hw(struct gpio_chip *gc)
+{
+	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(gc);
+
+	/* Disable IRQ by default */
+	outb(0, idio16gpio->base + 2);
+	outb(0, idio16gpio->base + 1);
+
+	return 0;
+}
+
 static int idio_16_probe(struct device *dev, unsigned int id)
 {
 	struct idio_16_gpio *idio16gpio;
 	const char *const name = dev_name(dev);
+	struct gpio_irq_chip *girq;
 	int err;
 
 	idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
@@ -256,6 +268,16 @@ static int idio_16_probe(struct device *dev, unsigned int id)
 	idio16gpio->base = base[id];
 	idio16gpio->out_state = 0xFFFF;
 
+	girq = &idio16gpio->chip.irq;
+	girq->chip = &idio_16_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_edge_irq;
+	girq->init_hw = idio_16_irq_init_hw;
+
 	raw_spin_lock_init(&idio16gpio->lock);
 
 	err = devm_gpiochip_add_data(dev, &idio16gpio->chip, idio16gpio);
@@ -264,17 +286,6 @@ static int idio_16_probe(struct device *dev, unsigned int id)
 		return err;
 	}
 
-	/* Disable IRQ by default */
-	outb(0, base[id] + 2);
-	outb(0, base[id] + 1);
-
-	err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
-		handle_edge_irq, IRQ_TYPE_NONE);
-	if (err) {
-		dev_err(dev, "Could not add irqchip (%d)\n", err);
-		return err;
-	}
-
 	err = devm_request_irq(dev, irq[id], idio_16_irq_handler, 0, name,
 		idio16gpio);
 	if (err) {

drivers/gpio/gpio-adnp.c

@@ -238,36 +238,6 @@ static void adnp_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 	mutex_unlock(&adnp->i2c_lock);
 }
 
-static int adnp_gpio_setup(struct adnp *adnp, unsigned int num_gpios)
-{
-	struct gpio_chip *chip = &adnp->gpio;
-	int err;
-
-	adnp->reg_shift = get_count_order(num_gpios) - 3;
-
-	chip->direction_input = adnp_gpio_direction_input;
-	chip->direction_output = adnp_gpio_direction_output;
-	chip->get = adnp_gpio_get;
-	chip->set = adnp_gpio_set;
-	chip->can_sleep = true;
-
-	if (IS_ENABLED(CONFIG_DEBUG_FS))
-		chip->dbg_show = adnp_gpio_dbg_show;
-
-	chip->base = -1;
-	chip->ngpio = num_gpios;
-	chip->label = adnp->client->name;
-	chip->parent = &adnp->client->dev;
-	chip->of_node = chip->parent->of_node;
-	chip->owner = THIS_MODULE;
-
-	err = devm_gpiochip_add_data(&adnp->client->dev, chip, adnp);
-	if (err)
-		return err;
-
-	return 0;
-}
-
 static irqreturn_t adnp_irq(int irq, void *data)
 {
 	struct adnp *adnp = data;
@@ -464,18 +434,54 @@ static int adnp_irq_setup(struct adnp *adnp)
 		return err;
 	}
 
-	err = gpiochip_irqchip_add_nested(chip,
-					  &adnp_irq_chip,
-					  0,
-					  handle_simple_irq,
-					  IRQ_TYPE_NONE);
-	if (err) {
-		dev_err(chip->parent,
-			"could not connect irqchip to gpiochip\n");
+	return 0;
+}
+
+static int adnp_gpio_setup(struct adnp *adnp, unsigned int num_gpios,
+			   bool is_irq_controller)
+{
+	struct gpio_chip *chip = &adnp->gpio;
+	int err;
+
+	adnp->reg_shift = get_count_order(num_gpios) - 3;
+
+	chip->direction_input = adnp_gpio_direction_input;
+	chip->direction_output = adnp_gpio_direction_output;
+	chip->get = adnp_gpio_get;
+	chip->set = adnp_gpio_set;
+	chip->can_sleep = true;
+
+	if (IS_ENABLED(CONFIG_DEBUG_FS))
+		chip->dbg_show = adnp_gpio_dbg_show;
+
+	chip->base = -1;
+	chip->ngpio = num_gpios;
+	chip->label = adnp->client->name;
+	chip->parent = &adnp->client->dev;
+	chip->of_node = chip->parent->of_node;
+	chip->owner = THIS_MODULE;
+
+	if (is_irq_controller) {
+		struct gpio_irq_chip *girq;
+
+		err = adnp_irq_setup(adnp);
+		if (err)
 			return err;
+
+		girq = &chip->irq;
+		girq->chip = &adnp_irq_chip;
+		/* This will let us handle the parent IRQ in the driver */
+		girq->parent_handler = NULL;
+		girq->num_parents = 0;
+		girq->parents = NULL;
+		girq->default_type = IRQ_TYPE_NONE;
+		girq->handler = handle_simple_irq;
+		girq->threaded = true;
 	}
 
-	gpiochip_set_nested_irqchip(chip, &adnp_irq_chip, adnp->client->irq);
+	err = devm_gpiochip_add_data(&adnp->client->dev, chip, adnp);
+	if (err)
+		return err;
 
 	return 0;
 }
@@ -503,15 +509,10 @@ static int adnp_i2c_probe(struct i2c_client *client,
 	mutex_init(&adnp->i2c_lock);
 	adnp->client = client;
 
-	err = adnp_gpio_setup(adnp, num_gpios);
-	if (err)
-		return err;
-
-	if (of_find_property(np, "interrupt-controller", NULL)) {
-		err = adnp_irq_setup(adnp);
+	err = adnp_gpio_setup(adnp, num_gpios,
+			of_property_read_bool(np, "interrupt-controller"));
 	if (err)
 		return err;
-	}
 
 	i2c_set_clientdata(client, adnp);
 

drivers/gpio/gpio-adp5588.c

@@ -272,13 +272,24 @@ static irqreturn_t adp5588_irq_handler(int irq, void *devid)
 	return IRQ_HANDLED;
 }
 
+
+static int adp5588_irq_init_hw(struct gpio_chip *gc)
+{
+	struct adp5588_gpio *dev = gpiochip_get_data(gc);
+	/* Enable IRQs after registering chip */
+	adp5588_gpio_write(dev->client, CFG,
+			   ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_KE_IEN);
+
+	return 0;
+}
+
 static int adp5588_irq_setup(struct adp5588_gpio *dev)
 {
 	struct i2c_client *client = dev->client;
 	int ret;
 	struct adp5588_gpio_platform_data *pdata =
 			dev_get_platdata(&client->dev);
-	int irq_base = pdata ? pdata->irq_base : 0;
+	struct gpio_irq_chip *girq;
 
 	adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
 	adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
@@ -294,21 +305,19 @@ static int adp5588_irq_setup(struct adp5588_gpio *dev)
 			client->irq);
 		return ret;
 	}
-	ret = gpiochip_irqchip_add_nested(&dev->gpio_chip,
-					  &adp5588_irq_chip, irq_base,
-					  handle_simple_irq,
-					  IRQ_TYPE_NONE);
-	if (ret) {
-		dev_err(&client->dev,
-			"could not connect irqchip to gpiochip\n");
-		return ret;
-	}
-	gpiochip_set_nested_irqchip(&dev->gpio_chip,
-				    &adp5588_irq_chip,
-				    client->irq);
 
-	adp5588_gpio_write(client, CFG,
-		ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_KE_IEN);
+	/* This will be registered in the call to devm_gpiochip_add_data() */
+	girq = &dev->gpio_chip.irq;
+	girq->chip = &adp5588_irq_chip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->first = pdata ? pdata->irq_base : 0;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_simple_irq;
+	girq->init_hw = adp5588_irq_init_hw;
+	girq->threaded = true;
 
 	return 0;
 }

drivers/gpio/gpio-aggregator.c

@@ -10,6 +10,7 @@
 #include <linux/bitmap.h>
 #include <linux/bitops.h>
 #include <linux/ctype.h>
+#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
 #include <linux/gpio/machine.h>
@@ -38,9 +39,9 @@ static DEFINE_IDR(gpio_aggregator_idr);
 
 static char *get_arg(char **args)
 {
-	char *start = *args, *end;
+	char *start, *end;
 
-	start = skip_spaces(start);
+	start = skip_spaces(*args);
 	if (!*start)
 		return NULL;
 
@@ -111,55 +112,45 @@ static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key,
 
 static int aggr_parse(struct gpio_aggregator *aggr)
 {
-	unsigned int first_index, last_index, i, n = 0;
-	char *name, *offsets, *first, *last, *next;
 	char *args = aggr->args;
-	int error;
+	unsigned long *bitmap;
+	unsigned int i, n = 0;
+	char *name, *offsets;
+	int error = 0;
+
+	bitmap = bitmap_alloc(ARCH_NR_GPIOS, GFP_KERNEL);
+	if (!bitmap)
+		return -ENOMEM;
 
 	for (name = get_arg(&args), offsets = get_arg(&args); name;
 	     offsets = get_arg(&args)) {
 		if (IS_ERR(name)) {
 			pr_err("Cannot get GPIO specifier: %pe\n", name);
-			return PTR_ERR(name);
+			error = PTR_ERR(name);
+			goto free_bitmap;
 		}
 
 		if (!isrange(offsets)) {
 			/* Named GPIO line */
 			error = aggr_add_gpio(aggr, name, U16_MAX, &n);
 			if (error)
-				return error;
+				goto free_bitmap;
 
 			name = offsets;
 			continue;
 		}
 
 		/* GPIO chip + offset(s) */
-		for (first = offsets; *first; first = next) {
-			next = strchrnul(first, ',');
-			if (*next)
-				*next++ = '\0';
-
-			last = strchr(first, '-');
-			if (last)
-				*last++ = '\0';
-
-			if (kstrtouint(first, 10, &first_index)) {
-				pr_err("Cannot parse GPIO index %s\n", first);
-				return -EINVAL;
+		error = bitmap_parselist(offsets, bitmap, ARCH_NR_GPIOS);
+		if (error) {
+			pr_err("Cannot parse %s: %d\n", offsets, error);
+			goto free_bitmap;
 		}
 
-			if (!last) {
-				last_index = first_index;
-			} else if (kstrtouint(last, 10, &last_index)) {
-				pr_err("Cannot parse GPIO index %s\n", last);
-				return -EINVAL;
-			}
-
-			for (i = first_index; i <= last_index; i++) {
+		for_each_set_bit(i, bitmap, ARCH_NR_GPIOS) {
 			error = aggr_add_gpio(aggr, name, i, &n);
 			if (error)
-					return error;
-			}
+				goto free_bitmap;
 		}
 
 		name = get_arg(&args);
@@ -167,10 +158,12 @@ static int aggr_parse(struct gpio_aggregator *aggr)
 
 	if (!n) {
 		pr_err("No GPIOs specified\n");
-		return -EINVAL;
+		error = -EINVAL;
 	}
 
-	return 0;
+free_bitmap:
+	bitmap_free(bitmap);
+	return error;
 }
 
 static ssize_t new_device_store(struct device_driver *driver, const char *buf,

drivers/gpio/gpio-altera.c

@@ -24,6 +24,7 @@
 * @interrupt_trigger	: specifies the hardware configured IRQ trigger type
 *			  (rising, falling, both, high)
 * @mapped_irq		: kernel mapped irq number.
+* @irq_chip		: IRQ chip configuration
 */
 struct altera_gpio_chip {
 	struct of_mm_gpio_chip mmchip;
@@ -69,7 +70,7 @@ static void altera_gpio_irq_mask(struct irq_data *d)
 	raw_spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
 }
 
-/**
+/*
  * This controller's IRQ type is synthesized in hardware, so this function
  * just checks if the requested set_type matches the synthesized IRQ type
  */

drivers/gpio/gpio-crystalcove.c

@@ -129,7 +129,7 @@ static void crystalcove_update_irq_ctrl(struct crystalcove_gpio *cg, int gpio)
 	regmap_update_bits(cg->regmap, reg, CTLI_INTCNT_BE, cg->intcnt_value);
 }
 
-static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned gpio)
+static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned int gpio)
 {
 	struct crystalcove_gpio *cg = gpiochip_get_data(chip);
 	int reg = to_reg(gpio, CTRL_OUT);
@@ -140,7 +140,7 @@ static int crystalcove_gpio_dir_in(struct gpio_chip *chip, unsigned gpio)
 	return regmap_write(cg->regmap, reg, CTLO_INPUT_SET);
 }
 
-static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned gpio,
+static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned int gpio,
 				    int value)
 {
 	struct crystalcove_gpio *cg = gpiochip_get_data(chip);
@@ -152,7 +152,7 @@ static int crystalcove_gpio_dir_out(struct gpio_chip *chip, unsigned gpio,
 	return regmap_write(cg->regmap, reg, CTLO_OUTPUT_SET | value);
 }
 
-static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned gpio)
+static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned int gpio)
 {
 	struct crystalcove_gpio *cg = gpiochip_get_data(chip);
 	unsigned int val;
@@ -169,7 +169,7 @@ static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned gpio)
 }
 
 static void crystalcove_gpio_set(struct gpio_chip *chip,
-				 unsigned gpio, int value)
+				 unsigned int gpio, int value)
 {
 	struct crystalcove_gpio *cg = gpiochip_get_data(chip);
 	int reg = to_reg(gpio, CTRL_OUT);
@@ -183,7 +183,7 @@ static void crystalcove_gpio_set(struct gpio_chip *chip,
 		regmap_update_bits(cg->regmap, reg, 1, 0);
 }
 
-static int crystalcove_irq_type(struct irq_data *data, unsigned type)
+static int crystalcove_irq_type(struct irq_data *data, unsigned int type)
 {
 	struct crystalcove_gpio *cg =
 		gpiochip_get_data(irq_data_get_irq_chip_data(data));
@@ -330,6 +330,7 @@ static int crystalcove_gpio_probe(struct platform_device *pdev)
 	int retval;
 	struct device *dev = pdev->dev.parent;
 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
+	struct gpio_irq_chip *girq;
 
 	if (irq < 0)
 		return irq;
@@ -353,46 +354,39 @@ static int crystalcove_gpio_probe(struct platform_device *pdev)
 	cg->chip.dbg_show = crystalcove_gpio_dbg_show;
 	cg->regmap = pmic->regmap;
 
-	retval = devm_gpiochip_add_data(&pdev->dev, &cg->chip, cg);
+	girq = &cg->chip.irq;
+	girq->chip = &crystalcove_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_simple_irq;
+	girq->threaded = true;
+
+	retval = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+					   crystalcove_gpio_irq_handler,
+					   IRQF_ONESHOT, KBUILD_MODNAME, cg);
 	if (retval) {
-		dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval);
+		dev_warn(&pdev->dev, "request irq failed: %d\n", retval);
 		return retval;
 	}
 
-	gpiochip_irqchip_add_nested(&cg->chip, &crystalcove_irqchip, 0,
-				    handle_simple_irq, IRQ_TYPE_NONE);
-
-	retval = request_threaded_irq(irq, NULL, crystalcove_gpio_irq_handler,
-				      IRQF_ONESHOT, KBUILD_MODNAME, cg);
-
+	retval = devm_gpiochip_add_data(&pdev->dev, &cg->chip, cg);
 	if (retval) {
-		dev_warn(&pdev->dev, "request irq failed: %d\n", retval);
+		dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval);
 		return retval;
 	}
 
-	gpiochip_set_nested_irqchip(&cg->chip, &crystalcove_irqchip, irq);
-
-	return 0;
-}
-
-static int crystalcove_gpio_remove(struct platform_device *pdev)
-{
-	struct crystalcove_gpio *cg = platform_get_drvdata(pdev);
-	int irq = platform_get_irq(pdev, 0);
-
-	if (irq >= 0)
-		free_irq(irq, cg);
 	return 0;
 }
 
 static struct platform_driver crystalcove_gpio_driver = {
 	.probe = crystalcove_gpio_probe,
-	.remove = crystalcove_gpio_remove,
 	.driver = {
 		.name = "crystal_cove_gpio",
 	},
 };
-
 module_platform_driver(crystalcove_gpio_driver);
 
 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");

drivers/gpio/gpio-dln2.c

@@ -440,6 +440,7 @@ static int dln2_gpio_probe(struct platform_device *pdev)
 {
 	struct dln2_gpio *dln2;
 	struct device *dev = &pdev->dev;
+	struct gpio_irq_chip *girq;
 	int pins;
 	int ret;
 
@@ -476,6 +477,15 @@ static int dln2_gpio_probe(struct platform_device *pdev)
 	dln2->gpio.direction_output = dln2_gpio_direction_output;
 	dln2->gpio.set_config = dln2_gpio_set_config;
 
+	girq = &dln2->gpio.irq;
+	girq->chip = &dln2_gpio_irqchip;
+	/* The event comes from the outside so no parent handler */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_simple_irq;
+
 	platform_set_drvdata(pdev, dln2);
 
 	ret = devm_gpiochip_add_data(dev, &dln2->gpio, dln2);
@@ -484,13 +494,6 @@ static int dln2_gpio_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = gpiochip_irqchip_add(&dln2->gpio, &dln2_gpio_irqchip, 0,
-				   handle_simple_irq, IRQ_TYPE_NONE);
-	if (ret < 0) {
-		dev_err(dev, "failed to add irq chip: %d\n", ret);
-		return ret;
-	}
-
 	ret = dln2_register_event_cb(pdev, DLN2_GPIO_CONDITION_MET_EV,
 				     dln2_gpio_event);
 	if (ret) {

drivers/gpio/gpio-ich.c

@@ -74,8 +74,8 @@ struct ichx_desc {
 	u32 use_sel_ignore[3];
 
 	/* Some chipsets have quirks, let these use their own request/get */
-	int (*request)(struct gpio_chip *chip, unsigned offset);
-	int (*get)(struct gpio_chip *chip, unsigned offset);
+	int (*request)(struct gpio_chip *chip, unsigned int offset);
+	int (*get)(struct gpio_chip *chip, unsigned int offset);
 
 	/*
 	 * Some chipsets don't let reading output values on GPIO_LVL register
@@ -100,7 +100,7 @@ static int modparam_gpiobase = -1;	/* dynamic */
 module_param_named(gpiobase, modparam_gpiobase, int, 0444);
 MODULE_PARM_DESC(gpiobase, "The GPIO number base. -1 means dynamic, which is the default.");
 
-static int ichx_write_bit(int reg, unsigned nr, int val, int verify)
+static int ichx_write_bit(int reg, unsigned int nr, int val, int verify)
 {
 	unsigned long flags;
 	u32 data, tmp;
@@ -132,7 +132,7 @@ static int ichx_write_bit(int reg, unsigned nr, int val, int verify)
 	return (verify && data != tmp) ? -EPERM : 0;
 }
 
-static int ichx_read_bit(int reg, unsigned nr)
+static int ichx_read_bit(int reg, unsigned int nr)
 {
 	unsigned long flags;
 	u32 data;
@@ -152,12 +152,12 @@ static int ichx_read_bit(int reg, unsigned nr)
 	return !!(data & BIT(bit));
 }
 
-static bool ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr)
+static bool ichx_gpio_check_available(struct gpio_chip *gpio, unsigned int nr)
 {
 	return !!(ichx_priv.use_gpio & BIT(nr / 32));
 }
 
-static int ichx_gpio_get_direction(struct gpio_chip *gpio, unsigned nr)
+static int ichx_gpio_get_direction(struct gpio_chip *gpio, unsigned int nr)
 {
 	if (ichx_read_bit(GPIO_IO_SEL, nr))
 		return GPIO_LINE_DIRECTION_IN;
@@ -165,7 +165,7 @@ static int ichx_gpio_get_direction(struct gpio_chip *gpio, unsigned nr)
 	return GPIO_LINE_DIRECTION_OUT;
 }
 
-static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
+static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned int nr)
 {
 	/*
 	 * Try setting pin as an input and verify it worked since many pins
@@ -174,7 +174,7 @@ static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
 	return ichx_write_bit(GPIO_IO_SEL, nr, 1, 1);
 }
 
-static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
+static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned int nr,
 					int val)
 {
 	/* Disable blink hardware which is available for GPIOs from 0 to 31. */
@@ -191,12 +191,12 @@ static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
 	return ichx_write_bit(GPIO_IO_SEL, nr, 0, 1);
 }
 
-static int ichx_gpio_get(struct gpio_chip *chip, unsigned nr)
+static int ichx_gpio_get(struct gpio_chip *chip, unsigned int nr)
 {
 	return ichx_read_bit(GPIO_LVL, nr);
 }
 
-static int ich6_gpio_get(struct gpio_chip *chip, unsigned nr)
+static int ich6_gpio_get(struct gpio_chip *chip, unsigned int nr)
 {
 	unsigned long flags;
 	u32 data;
@@ -223,7 +223,7 @@ static int ich6_gpio_get(struct gpio_chip *chip, unsigned nr)
 	}
 }
 
-static int ichx_gpio_request(struct gpio_chip *chip, unsigned nr)
+static int ichx_gpio_request(struct gpio_chip *chip, unsigned int nr)
 {
 	if (!ichx_gpio_check_available(chip, nr))
 		return -ENXIO;
@@ -240,7 +240,7 @@ static int ichx_gpio_request(struct gpio_chip *chip, unsigned nr)
 	return ichx_read_bit(GPIO_USE_SEL, nr) ? 0 : -ENODEV;
 }
 
-static int ich6_gpio_request(struct gpio_chip *chip, unsigned nr)
+static int ich6_gpio_request(struct gpio_chip *chip, unsigned int nr)
 {
 	/*
 	 * Fixups for bits 16 and 17 are necessary on the Intel ICH6/3100
@@ -254,7 +254,7 @@ static int ich6_gpio_request(struct gpio_chip *chip, unsigned nr)
 	return ichx_gpio_request(chip, nr);
 }
 
-static void ichx_gpio_set(struct gpio_chip *chip, unsigned nr, int val)
+static void ichx_gpio_set(struct gpio_chip *chip, unsigned int nr, int val)
 {
 	ichx_write_bit(GPIO_LVL, nr, val, 0);
 }

drivers/gpio/gpio-it87.c

@@ -47,13 +47,13 @@
 
 /**
  * struct it87_gpio - it87-specific GPIO chip
- * @chip the underlying gpio_chip structure
- * @lock a lock to avoid races between operations
- * @io_base base address for gpio ports
- * @io_size size of the port rage starting from io_base.
- * @output_base Super I/O register address for Output Enable register
- * @simple_base Super I/O 'Simple I/O' Enable register
- * @simple_size Super IO 'Simple I/O' Enable register size; this is
+ * @chip: the underlying gpio_chip structure
+ * @lock: a lock to avoid races between operations
+ * @io_base: base address for gpio ports
+ * @io_size: size of the port rage starting from io_base.
+ * @output_base: Super I/O register address for Output Enable register
+ * @simple_base: Super I/O 'Simple I/O' Enable register
+ * @simple_size: Super IO 'Simple I/O' Enable register size; this is
  *	required because IT87xx chips might only provide Simple I/O
  *	switches on a subset of lines, whereas the others keep the
  *	same status all time.

drivers/gpio/gpio-max732x.c

@@ -503,6 +503,8 @@ static int max732x_irq_setup(struct max732x_chip *chip,
 
 	if (((pdata && pdata->irq_base) || client->irq)
 			&& has_irq != INT_NONE) {
+		struct gpio_irq_chip *girq;
+
 		if (pdata)
 			irq_base = pdata->irq_base;
 		chip->irq_features = has_irq;
@@ -517,19 +519,17 @@ static int max732x_irq_setup(struct max732x_chip *chip,
 				client->irq);
 			return ret;
 		}
-		ret =  gpiochip_irqchip_add_nested(&chip->gpio_chip,
-						   &max732x_irq_chip,
-						   irq_base,
-						   handle_simple_irq,
-						   IRQ_TYPE_NONE);
-		if (ret) {
-			dev_err(&client->dev,
-				"could not connect irqchip to gpiochip\n");
-			return ret;
-		}
-		gpiochip_set_nested_irqchip(&chip->gpio_chip,
-					    &max732x_irq_chip,
-					    client->irq);
+
+		girq = &chip->gpio_chip.irq;
+		girq->chip = &max732x_irq_chip;
+		/* This will let us handle the parent IRQ in the driver */
+		girq->parent_handler = NULL;
+		girq->num_parents = 0;
+		girq->parents = NULL;
+		girq->default_type = IRQ_TYPE_NONE;
+		girq->handler = handle_simple_irq;
+		girq->threaded = true;
+		girq->first = irq_base; /* FIXME: get rid of this */
 	}
 
 	return 0;
@@ -695,15 +695,15 @@ static int max732x_probe(struct i2c_client *client,
 			return ret;
 	}
 
-	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
+	ret = max732x_irq_setup(chip, id);
 	if (ret)
 		return ret;
 
-	ret = max732x_irq_setup(chip, id);
+	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
 	if (ret)
 		return ret;
 
-	if (pdata && pdata->setup) {
+	if (pdata->setup) {
 		ret = pdata->setup(client, chip->gpio_chip.base,
 				chip->gpio_chip.ngpio, pdata->context);
 		if (ret < 0)

drivers/gpio/gpio-max77620.c

@@ -19,8 +19,8 @@ struct max77620_gpio {
 	struct regmap		*rmap;
 	struct device		*dev;
 	struct mutex		buslock; /* irq_bus_lock */
-	unsigned int		irq_type[8];
-	bool			irq_enabled[8];
+	unsigned int		irq_type[MAX77620_GPIO_NR];
+	bool			irq_enabled[MAX77620_GPIO_NR];
 };
 
 static irqreturn_t max77620_gpio_irqhandler(int irq, void *data)
@@ -38,7 +38,7 @@ static irqreturn_t max77620_gpio_irqhandler(int irq, void *data)
 
 	pending = value;
 
-	for_each_set_bit(offset, &pending, 8) {
+	for_each_set_bit(offset, &pending, MAX77620_GPIO_NR) {
 		unsigned int virq;
 
 		virq = irq_find_mapping(gpio->gpio_chip.irq.domain, offset);
@@ -260,26 +260,54 @@ static int max77620_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 	return -ENOTSUPP;
 }
 
+static int max77620_gpio_irq_init_hw(struct gpio_chip *gc)
+{
+	struct max77620_gpio *gpio = gpiochip_get_data(gc);
+	unsigned int i;
+	int err;
+
+	/*
+	 * GPIO interrupts may be left ON after bootloader, hence let's
+	 * pre-initialize hardware to the expected state by disabling all
+	 * the interrupts.
+	 */
+	for (i = 0; i < MAX77620_GPIO_NR; i++) {
+		err = regmap_update_bits(gpio->rmap, GPIO_REG_ADDR(i),
+					 MAX77620_CNFG_GPIO_INT_MASK, 0);
+		if (err < 0) {
+			dev_err(gpio->dev,
+				"failed to disable interrupt: %d\n", err);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
 static int max77620_gpio_probe(struct platform_device *pdev)
 {
 	struct max77620_chip *chip =  dev_get_drvdata(pdev->dev.parent);
 	struct max77620_gpio *mgpio;
-	int gpio_irq;
+	struct gpio_irq_chip *girq;
+	unsigned int gpio_irq;
 	int ret;
 
-	gpio_irq = platform_get_irq(pdev, 0);
-	if (gpio_irq <= 0)
-		return -ENODEV;
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+
+	gpio_irq = ret;
 
 	mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL);
 	if (!mgpio)
 		return -ENOMEM;
 
+	mutex_init(&mgpio->buslock);
 	mgpio->rmap = chip->rmap;
 	mgpio->dev = &pdev->dev;
 
 	mgpio->gpio_chip.label = pdev->name;
-	mgpio->gpio_chip.parent = &pdev->dev;
+	mgpio->gpio_chip.parent = pdev->dev.parent;
 	mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
 	mgpio->gpio_chip.get = max77620_gpio_get;
 	mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
@@ -288,9 +316,17 @@ static int max77620_gpio_probe(struct platform_device *pdev)
 	mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR;
 	mgpio->gpio_chip.can_sleep = 1;
 	mgpio->gpio_chip.base = -1;
-#ifdef CONFIG_OF_GPIO
-	mgpio->gpio_chip.of_node = pdev->dev.parent->of_node;
-#endif
+
+	girq = &mgpio->gpio_chip.irq;
+	girq->chip = &max77620_gpio_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_edge_irq;
+	girq->init_hw = max77620_gpio_irq_init_hw,
+	girq->threaded = true;
 
 	platform_set_drvdata(pdev, mgpio);
 
@@ -300,21 +336,14 @@ static int max77620_gpio_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	mutex_init(&mgpio->buslock);
-
-	gpiochip_irqchip_add_nested(&mgpio->gpio_chip, &max77620_gpio_irqchip,
-				    0, handle_edge_irq, IRQ_TYPE_NONE);
-
-	ret = request_threaded_irq(gpio_irq, NULL, max77620_gpio_irqhandler,
-				   IRQF_ONESHOT, "max77620-gpio", mgpio);
+	ret = devm_request_threaded_irq(&pdev->dev, gpio_irq, NULL,
+					max77620_gpio_irqhandler, IRQF_ONESHOT,
+					"max77620-gpio", mgpio);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to request IRQ: %d\n", ret);
 		return ret;
 	}
 
-	gpiochip_set_nested_irqchip(&mgpio->gpio_chip, &max77620_gpio_irqchip,
-				    gpio_irq);
-
 	return 0;
 }
 

drivers/gpio/gpio-ml-ioh.c

@@ -44,7 +44,7 @@ struct ioh_regs {
 
 /**
  * struct ioh_gpio_reg_data - The register store data.
- * @ien_reg	To store contents of interrupt enable register.
+ * @ien_reg:	To store contents of interrupt enable register.
  * @imask_reg:	To store contents of interrupt mask regist
  * @po_reg:	To store contents of PO register.
  * @pm_reg:	To store contents of PM register.

drivers/gpio/gpio-mlxbf.c

@@ -127,7 +127,7 @@ static int mlxbf_gpio_resume(struct platform_device *pdev)
 }
 #endif
 
-static const struct acpi_device_id mlxbf_gpio_acpi_match[] = {
+static const struct acpi_device_id __maybe_unused mlxbf_gpio_acpi_match[] = {
 	{ "MLNXBF02", 0 },
 	{}
 };

drivers/gpio/gpio-mlxbf2.c

@@ -149,6 +149,8 @@ static int mlxbf2_gpio_lock_acquire(struct mlxbf2_gpio_context *gs)
  * Release the YU arm_gpio_lock after changing the direction mode.
  */
 static void mlxbf2_gpio_lock_release(struct mlxbf2_gpio_context *gs)
+	__releases(&gs->gc.bgpio_lock)
+	__releases(yu_arm_gpio_lock_param.lock)
 {
 	writel(YU_ARM_GPIO_LOCK_RELEASE, yu_arm_gpio_lock_param.io);
 	spin_unlock(&gs->gc.bgpio_lock);
@@ -309,7 +311,7 @@ static int mlxbf2_gpio_resume(struct platform_device *pdev)
 }
 #endif
 
-static const struct acpi_device_id mlxbf2_gpio_acpi_match[] = {
+static const struct acpi_device_id __maybe_unused mlxbf2_gpio_acpi_match[] = {
 	{ "MLNXBF22", 0 },
 	{},
 };

drivers/gpio/gpio-mmio.c

@@ -195,8 +195,7 @@ static int bgpio_get_multiple_be(struct gpio_chip *gc, unsigned long *mask,
 	*bits &= ~*mask;
 
 	/* Create a mirrored mask */
-	bit = -1;
-	while ((bit = find_next_bit(mask, gc->ngpio, bit + 1)) < gc->ngpio)
+	for_each_set_bit(bit, mask, gc->ngpio)
 		readmask |= bgpio_line2mask(gc, bit);
 
 	/* Read the register */
@@ -206,8 +205,7 @@ static int bgpio_get_multiple_be(struct gpio_chip *gc, unsigned long *mask,
 	 * Mirror the result into the "bits" result, this will give line 0
 	 * in bit 0 ... line 31 in bit 31 for a 32bit register.
 	 */
-	bit = -1;
-	while ((bit = find_next_bit(&val, gc->ngpio, bit + 1)) < gc->ngpio)
+	for_each_set_bit(bit, &val, gc->ngpio)
 		*bits |= bgpio_line2mask(gc, bit);
 
 	return 0;
@@ -272,16 +270,12 @@ static void bgpio_multiple_get_masks(struct gpio_chip *gc,
 	*set_mask = 0;
 	*clear_mask = 0;
 
-	for (i = 0; i < gc->bgpio_bits; i++) {
-		if (*mask == 0)
-			break;
-		if (__test_and_clear_bit(i, mask)) {
+	for_each_set_bit(i, mask, gc->bgpio_bits) {
 		if (test_bit(i, bits))
 			*set_mask |= bgpio_line2mask(gc, i);
 		else
 			*clear_mask |= bgpio_line2mask(gc, i);
 	}
-	}
 }
 
 static void bgpio_set_multiple_single_reg(struct gpio_chip *gc,

drivers/gpio/gpio-mpc8xxx.c

@@ -417,7 +417,7 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 
 	ret = devm_request_irq(&pdev->dev, mpc8xxx_gc->irqn,
 			       mpc8xxx_gpio_irq_cascade,
-			       IRQF_NO_THREAD | IRQF_SHARED, "gpio-cascade",
+			       IRQF_SHARED, "gpio-cascade",
 			       mpc8xxx_gc);
 	if (ret) {
 		dev_err(&pdev->dev, "%s: failed to devm_request_irq(%d), ret = %d\n",

drivers/gpio/gpio-mvebu.c

@@ -846,6 +846,7 @@ static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 {
 	struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
 	u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
+	const char *label;
 	int i;
 
 	regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &out);
@@ -857,15 +858,10 @@ static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 	edg_msk	= mvebu_gpio_read_edge_mask(mvchip);
 	lvl_msk	= mvebu_gpio_read_level_mask(mvchip);
 
-	for (i = 0; i < chip->ngpio; i++) {
-		const char *label;
+	for_each_requested_gpio(chip, i, label) {
 		u32 msk;
 		bool is_out;
 
-		label = gpiochip_is_requested(chip, i);
-		if (!label)
-			continue;
-
 		msk = BIT(i);
 		is_out = !(io_conf & msk);
 

drivers/gpio/gpio-omap.c

@@ -60,6 +60,7 @@ struct gpio_bank {
 	struct clk *dbck;
 	struct notifier_block nb;
 	unsigned int is_suspended:1;
+	unsigned int needs_resume:1;
 	u32 mod_usage;
 	u32 irq_usage;
 	u32 dbck_enable_mask;
@@ -896,12 +897,23 @@ static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
 				unsigned long config)
 {
 	u32 debounce;
+	int ret = -ENOTSUPP;
 
-	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
-		return -ENOTSUPP;
-
+	switch (pinconf_to_config_param(config)) {
+	case PIN_CONFIG_BIAS_DISABLE:
+	case PIN_CONFIG_BIAS_PULL_UP:
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		ret = gpiochip_generic_config(chip, offset, config);
+		break;
+	case PIN_CONFIG_INPUT_DEBOUNCE:
 		debounce = pinconf_to_config_argument(config);
-	return omap_gpio_debounce(chip, offset, debounce);
+		ret = omap_gpio_debounce(chip, offset, debounce);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
 }
 
 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
@@ -1504,9 +1516,34 @@ static int __maybe_unused omap_gpio_runtime_resume(struct device *dev)
 	return 0;
 }
 
+static int omap_gpio_suspend(struct device *dev)
+{
+	struct gpio_bank *bank = dev_get_drvdata(dev);
+
+	if (bank->is_suspended)
+		return 0;
+
+	bank->needs_resume = 1;
+
+	return omap_gpio_runtime_suspend(dev);
+}
+
+static int omap_gpio_resume(struct device *dev)
+{
+	struct gpio_bank *bank = dev_get_drvdata(dev);
+
+	if (!bank->needs_resume)
+		return 0;
+
+	bank->needs_resume = 0;
+
+	return omap_gpio_runtime_resume(dev);
+}
+
 static const struct dev_pm_ops gpio_pm_ops = {
 	SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume,
 									NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(omap_gpio_suspend, omap_gpio_resume)
 };
 
 static struct platform_driver omap_gpio_driver = {

drivers/gpio/gpio-pca953x.c

@@ -89,6 +89,7 @@ static const struct i2c_device_id pca953x_id[] = {
 
 	{ "pcal6416", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
 	{ "pcal6524", 24 | PCA953X_TYPE | PCA_LATCH_INT, },
+	{ "pcal9535", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
 	{ "pcal9555a", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
 
 	{ "max7310", 8  | PCA953X_TYPE, },
@@ -833,6 +834,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base)
 	struct irq_chip *irq_chip = &chip->irq_chip;
 	DECLARE_BITMAP(reg_direction, MAX_LINE);
 	DECLARE_BITMAP(irq_stat, MAX_LINE);
+	struct gpio_irq_chip *girq;
 	int ret;
 
 	if (dmi_first_match(pca953x_dmi_acpi_irq_info)) {
@@ -863,17 +865,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base)
 	bitmap_and(chip->irq_stat, irq_stat, reg_direction, chip->gpio_chip.ngpio);
 	mutex_init(&chip->irq_lock);
 
-	ret = devm_request_threaded_irq(&client->dev, client->irq,
-					NULL, pca953x_irq_handler,
-					IRQF_ONESHOT | IRQF_SHARED,
-					dev_name(&client->dev), chip);
-	if (ret) {
-		dev_err(&client->dev, "failed to request irq %d\n",
-			client->irq);
-		return ret;
-	}
-
-	irq_chip->name = dev_name(&chip->client->dev);
+	irq_chip->name = dev_name(&client->dev);
 	irq_chip->irq_mask = pca953x_irq_mask;
 	irq_chip->irq_unmask = pca953x_irq_unmask;
 	irq_chip->irq_set_wake = pca953x_irq_set_wake;
@@ -882,17 +874,27 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base)
 	irq_chip->irq_set_type = pca953x_irq_set_type;
 	irq_chip->irq_shutdown = pca953x_irq_shutdown;
 
-	ret = gpiochip_irqchip_add_nested(&chip->gpio_chip, irq_chip,
-					  irq_base, handle_simple_irq,
-					  IRQ_TYPE_NONE);
+	girq = &chip->gpio_chip.irq;
+	girq->chip = irq_chip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_simple_irq;
+	girq->threaded = true;
+	girq->first = irq_base; /* FIXME: get rid of this */
+
+	ret = devm_request_threaded_irq(&client->dev, client->irq,
+					NULL, pca953x_irq_handler,
+					IRQF_ONESHOT | IRQF_SHARED,
+					dev_name(&client->dev), chip);
 	if (ret) {
-		dev_err(&client->dev,
-			"could not connect irqchip to gpiochip\n");
+		dev_err(&client->dev, "failed to request irq %d\n",
+			client->irq);
 		return ret;
 	}
 
-	gpiochip_set_nested_irqchip(&chip->gpio_chip, irq_chip, client->irq);
-
 	return 0;
 }
 
@@ -1079,11 +1081,11 @@ static int pca953x_probe(struct i2c_client *client,
 	if (ret)
 		goto err_exit;
 
-	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
+	ret = pca953x_irq_setup(chip, irq_base);
 	if (ret)
 		goto err_exit;
 
-	ret = pca953x_irq_setup(chip, irq_base);
+	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
 	if (ret)
 		goto err_exit;
 
@@ -1234,6 +1236,7 @@ static const struct of_device_id pca953x_dt_ids[] = {
 
 	{ .compatible = "nxp,pcal6416", .data = OF_953X(16, PCA_LATCH_INT), },
 	{ .compatible = "nxp,pcal6524", .data = OF_953X(24, PCA_LATCH_INT), },
+	{ .compatible = "nxp,pcal9535", .data = OF_953X(16, PCA_LATCH_INT), },
 	{ .compatible = "nxp,pcal9555a", .data = OF_953X(16, PCA_LATCH_INT), },
 
 	{ .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },

drivers/gpio/gpio-pca9570.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for PCA9570 I2C GPO expander
+ *
+ * Copyright (C) 2020 Sungbo Eo <mans0n@gorani.run>
+ *
+ * Based on gpio-tpic2810.c
+ * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
+ *	Andrew F. Davis <afd@ti.com>
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+
+/**
+ * struct pca9570 - GPIO driver data
+ * @chip: GPIO controller chip
+ * @lock: Protects write sequences
+ * @out: Buffer for device register
+ */
+struct pca9570 {
+	struct gpio_chip chip;
+	struct mutex lock;
+	u8 out;
+};
+
+static int pca9570_read(struct pca9570 *gpio, u8 *value)
+{
+	struct i2c_client *client = to_i2c_client(gpio->chip.parent);
+	int ret;
+
+	ret = i2c_smbus_read_byte(client);
+	if (ret < 0)
+		return ret;
+
+	*value = ret;
+	return 0;
+}
+
+static int pca9570_write(struct pca9570 *gpio, u8 value)
+{
+	struct i2c_client *client = to_i2c_client(gpio->chip.parent);
+
+	return i2c_smbus_write_byte(client, value);
+}
+
+static int pca9570_get_direction(struct gpio_chip *chip,
+				 unsigned offset)
+{
+	/* This device always output */
+	return GPIO_LINE_DIRECTION_OUT;
+}
+
+static int pca9570_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct pca9570 *gpio = gpiochip_get_data(chip);
+	u8 buffer;
+	int ret;
+
+	ret = pca9570_read(gpio, &buffer);
+	if (ret)
+		return ret;
+
+	return !!(buffer & BIT(offset));
+}
+
+static void pca9570_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct pca9570 *gpio = gpiochip_get_data(chip);
+	u8 buffer;
+	int ret;
+
+	mutex_lock(&gpio->lock);
+
+	buffer = gpio->out;
+	if (value)
+		buffer |= BIT(offset);
+	else
+		buffer &= ~BIT(offset);
+
+	ret = pca9570_write(gpio, buffer);
+	if (ret)
+		goto out;
+
+	gpio->out = buffer;
+
+out:
+	mutex_unlock(&gpio->lock);
+}
+
+static int pca9570_probe(struct i2c_client *client)
+{
+	struct pca9570 *gpio;
+
+	gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
+	if (!gpio)
+		return -ENOMEM;
+
+	gpio->chip.label = client->name;
+	gpio->chip.parent = &client->dev;
+	gpio->chip.owner = THIS_MODULE;
+	gpio->chip.get_direction = pca9570_get_direction;
+	gpio->chip.get = pca9570_get;
+	gpio->chip.set = pca9570_set;
+	gpio->chip.base = -1;
+	gpio->chip.ngpio = (uintptr_t)device_get_match_data(&client->dev);
+	gpio->chip.can_sleep = true;
+
+	mutex_init(&gpio->lock);
+
+	/* Read the current output level */
+	pca9570_read(gpio, &gpio->out);
+
+	i2c_set_clientdata(client, gpio);
+
+	return devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
+}
+
+static const struct i2c_device_id pca9570_id_table[] = {
+	{ "pca9570", 4 },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, pca9570_id_table);
+
+static const struct of_device_id pca9570_of_match_table[] = {
+	{ .compatible = "nxp,pca9570", .data = (void *)4 },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pca9570_of_match_table);
+
+static struct i2c_driver pca9570_driver = {
+	.driver = {
+		.name = "pca9570",
+		.of_match_table = pca9570_of_match_table,
+	},
+	.probe_new = pca9570_probe,
+	.id_table = pca9570_id_table,
+};
+module_i2c_driver(pca9570_driver);
+
+MODULE_AUTHOR("Sungbo Eo <mans0n@gorani.run>");
+MODULE_DESCRIPTION("GPIO expander driver for PCA9570");
+MODULE_LICENSE("GPL v2");

drivers/gpio/gpio-pcf857x.c

@@ -334,29 +334,19 @@ static int pcf857x_probe(struct i2c_client *client,
 	gpio->out = ~n_latch;
 	gpio->status = gpio->out;
 
-	status = devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
-	if (status < 0)
-		goto fail;
-
 	/* Enable irqchip if we have an interrupt */
 	if (client->irq) {
-		gpio->irqchip.name = "pcf857x",
-		gpio->irqchip.irq_enable = pcf857x_irq_enable,
-		gpio->irqchip.irq_disable = pcf857x_irq_disable,
-		gpio->irqchip.irq_ack = noop,
-		gpio->irqchip.irq_mask = noop,
-		gpio->irqchip.irq_unmask = noop,
-		gpio->irqchip.irq_set_wake = pcf857x_irq_set_wake,
-		gpio->irqchip.irq_bus_lock = pcf857x_irq_bus_lock,
-		gpio->irqchip.irq_bus_sync_unlock = pcf857x_irq_bus_sync_unlock,
-		status = gpiochip_irqchip_add_nested(&gpio->chip,
-						     &gpio->irqchip,
-						     0, handle_level_irq,
-						     IRQ_TYPE_NONE);
-		if (status) {
-			dev_err(&client->dev, "cannot add irqchip\n");
-			goto fail;
-		}
+		struct gpio_irq_chip *girq;
+
+		gpio->irqchip.name = "pcf857x";
+		gpio->irqchip.irq_enable = pcf857x_irq_enable;
+		gpio->irqchip.irq_disable = pcf857x_irq_disable;
+		gpio->irqchip.irq_ack = noop;
+		gpio->irqchip.irq_mask = noop;
+		gpio->irqchip.irq_unmask = noop;
+		gpio->irqchip.irq_set_wake = pcf857x_irq_set_wake;
+		gpio->irqchip.irq_bus_lock = pcf857x_irq_bus_lock;
+		gpio->irqchip.irq_bus_sync_unlock = pcf857x_irq_bus_sync_unlock;
 
 		status = devm_request_threaded_irq(&client->dev, client->irq,
 					NULL, pcf857x_irq, IRQF_ONESHOT |
@@ -365,10 +355,21 @@ static int pcf857x_probe(struct i2c_client *client,
 		if (status)
 			goto fail;
 
-		gpiochip_set_nested_irqchip(&gpio->chip, &gpio->irqchip,
-					    client->irq);
+		girq = &gpio->chip.irq;
+		girq->chip = &gpio->irqchip;
+		/* This will let us handle the parent IRQ in the driver */
+		girq->parent_handler = NULL;
+		girq->num_parents = 0;
+		girq->parents = NULL;
+		girq->default_type = IRQ_TYPE_NONE;
+		girq->handler = handle_level_irq;
+		girq->threaded = true;
 	}
 
+	status = devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
+	if (status < 0)
+		goto fail;
+
 	/* Let platform code set up the GPIOs and their users.
 	 * Now is the first time anyone could use them.
 	 */

drivers/gpio/gpio-pch.c

@@ -95,7 +95,7 @@ struct pch_gpio {
 	spinlock_t spinlock;
 };
 
-static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
+static void pch_gpio_set(struct gpio_chip *gpio, unsigned int nr, int val)
 {
 	u32 reg_val;
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);
@@ -112,14 +112,14 @@ static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
 	spin_unlock_irqrestore(&chip->spinlock, flags);
 }
 
-static int pch_gpio_get(struct gpio_chip *gpio, unsigned nr)
+static int pch_gpio_get(struct gpio_chip *gpio, unsigned int nr)
 {
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);
 
 	return !!(ioread32(&chip->reg->pi) & BIT(nr));
 }
 
-static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
+static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned int nr,
 				     int val)
 {
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);
@@ -146,7 +146,7 @@ static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
 	return 0;
 }
 
-static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
+static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned int nr)
 {
 	struct pch_gpio *chip =	gpiochip_get_data(gpio);
 	u32 pm;
@@ -196,9 +196,10 @@ static void __maybe_unused pch_gpio_restore_reg_conf(struct pch_gpio *chip)
 		iowrite32(chip->pch_gpio_reg.gpio_use_sel_reg, &chip->reg->gpio_use_sel);
 }
 
-static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
+static int pch_gpio_to_irq(struct gpio_chip *gpio, unsigned int offset)
 {
 	struct pch_gpio *chip = gpiochip_get_data(gpio);
+
 	return chip->irq_base + offset;
 }
 
@@ -304,9 +305,10 @@ static irqreturn_t pch_gpio_handler(int irq, void *dev_id)
 	unsigned long reg_val = ioread32(&chip->reg->istatus);
 	int i;
 
-	dev_dbg(chip->dev, "irq=%d  status=0x%lx\n", irq, reg_val);
+	dev_vdbg(chip->dev, "irq=%d  status=0x%lx\n", irq, reg_val);
 
 	reg_val &= BIT(gpio_pins[chip->ioh]) - 1;
+
 	for_each_set_bit(i, &reg_val, gpio_pins[chip->ioh])
 		generic_handle_irq(chip->irq_base + i);
 

drivers/gpio/gpio-pci-idio-16.c

@@ -280,6 +280,17 @@ static const char *idio_16_names[IDIO_16_NGPIO] = {
 	"IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15"
 };
 
+static int idio_16_irq_init_hw(struct gpio_chip *gc)
+{
+	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(gc);
+
+	/* Disable IRQ by default and clear any pending interrupt */
+	iowrite8(0, &idio16gpio->reg->irq_ctl);
+	iowrite8(0, &idio16gpio->reg->in0_7);
+
+	return 0;
+}
+
 static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct device *const dev = &pdev->dev;
@@ -287,6 +298,7 @@ static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	int err;
 	const size_t pci_bar_index = 2;
 	const char *const name = pci_name(pdev);
+	struct gpio_irq_chip *girq;
 
 	idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
 	if (!idio16gpio)
@@ -323,6 +335,16 @@ static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	idio16gpio->chip.set = idio_16_gpio_set;
 	idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
 
+	girq = &idio16gpio->chip.irq;
+	girq->chip = &idio_16_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_edge_irq;
+	girq->init_hw = idio_16_irq_init_hw;
+
 	raw_spin_lock_init(&idio16gpio->lock);
 
 	err = devm_gpiochip_add_data(dev, &idio16gpio->chip, idio16gpio);
@@ -331,17 +353,6 @@ static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return err;
 	}
 
-	/* Disable IRQ by default and clear any pending interrupt */
-	iowrite8(0, &idio16gpio->reg->irq_ctl);
-	iowrite8(0, &idio16gpio->reg->in0_7);
-
-	err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
-		handle_edge_irq, IRQ_TYPE_NONE);
-	if (err) {
-		dev_err(dev, "Could not add irqchip (%d)\n", err);
-		return err;
-	}
-
 	err = devm_request_irq(dev, pdev->irq, idio_16_irq_handler, IRQF_SHARED,
 		name, idio16gpio);
 	if (err) {

drivers/gpio/gpio-pcie-idio-24.c

@@ -457,6 +457,7 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	int err;
 	const size_t pci_bar_index = 2;
 	const char *const name = pci_name(pdev);
+	struct gpio_irq_chip *girq;
 
 	idio24gpio = devm_kzalloc(dev, sizeof(*idio24gpio), GFP_KERNEL);
 	if (!idio24gpio)
@@ -490,6 +491,15 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	idio24gpio->chip.set = idio_24_gpio_set;
 	idio24gpio->chip.set_multiple = idio_24_gpio_set_multiple;
 
+	girq = &idio24gpio->chip.irq;
+	girq->chip = &idio_24_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_edge_irq;
+
 	raw_spin_lock_init(&idio24gpio->lock);
 
 	/* Software board reset */
@@ -501,13 +511,6 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return err;
 	}
 
-	err = gpiochip_irqchip_add(&idio24gpio->chip, &idio_24_irqchip, 0,
-		handle_edge_irq, IRQ_TYPE_NONE);
-	if (err) {
-		dev_err(dev, "Could not add irqchip (%d)\n", err);
-		return err;
-	}
-
 	err = devm_request_irq(dev, pdev->irq, idio_24_irq_handler, IRQF_SHARED,
 		name, idio24gpio);
 	if (err) {

drivers/gpio/gpio-pmic-eic-sprd.c

@@ -48,7 +48,7 @@ enum {
  * struct sprd_pmic_eic - PMIC EIC controller
  * @chip: the gpio_chip structure.
  * @intc: the irq_chip structure.
- * @regmap: the regmap from the parent device.
+ * @map:  the regmap from the parent device.
  * @offset: the EIC controller's offset address of the PMIC.
  * @reg: the array to cache the EIC registers.
  * @buslock: for bus lock/sync and unlock.

drivers/gpio/gpio-rcar.c

@@ -438,6 +438,7 @@ static int gpio_rcar_probe(struct platform_device *pdev)
 	struct resource *irq;
 	struct gpio_chip *gpio_chip;
 	struct irq_chip *irq_chip;
+	struct gpio_irq_chip *girq;
 	struct device *dev = &pdev->dev;
 	const char *name = dev_name(dev);
 	unsigned int npins;
@@ -496,19 +497,21 @@ static int gpio_rcar_probe(struct platform_device *pdev)
 	irq_chip->irq_set_wake = gpio_rcar_irq_set_wake;
 	irq_chip->flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_MASK_ON_SUSPEND;
 
+	girq = &gpio_chip->irq;
+	girq->chip = irq_chip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_level_irq;
+
 	ret = gpiochip_add_data(gpio_chip, p);
 	if (ret) {
 		dev_err(dev, "failed to add GPIO controller\n");
 		goto err0;
 	}
 
-	ret = gpiochip_irqchip_add(gpio_chip, irq_chip, 0, handle_level_irq,
-				   IRQ_TYPE_NONE);
-	if (ret) {
-		dev_err(dev, "cannot add irqchip\n");
-		goto err1;
-	}
-
 	p->irq_parent = irq->start;
 	if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler,
 			     IRQF_SHARED, name, p)) {

drivers/gpio/gpio-sama5d2-piobu.c

@@ -49,7 +49,7 @@ struct sama5d2_piobu {
 	struct regmap *regmap;
 };
 
-/**
+/*
  * sama5d2_piobu_setup_pin() - prepares a pin for set_direction call
  *
  * Do not consider pin for tamper detection (normal and backup modes)
@@ -73,7 +73,7 @@ static int sama5d2_piobu_setup_pin(struct gpio_chip *chip, unsigned int pin)
 	return regmap_update_bits(piobu->regmap, PIOBU_WKPR, mask, 0);
 }
 
-/**
+/*
  * sama5d2_piobu_write_value() - writes value & mask at the pin's PIOBU register
  */
 static int sama5d2_piobu_write_value(struct gpio_chip *chip, unsigned int pin,
@@ -88,7 +88,7 @@ static int sama5d2_piobu_write_value(struct gpio_chip *chip, unsigned int pin,
 	return regmap_update_bits(piobu->regmap, reg, mask, value);
 }
 
-/**
+/*
  * sama5d2_piobu_read_value() - read the value with masking from the pin's PIOBU
  *			      register
  */
@@ -108,7 +108,7 @@ static int sama5d2_piobu_read_value(struct gpio_chip *chip, unsigned int pin,
 	return val & mask;
 }
 
-/**
+/*
  * sama5d2_piobu_get_direction() - gpiochip get_direction
  */
 static int sama5d2_piobu_get_direction(struct gpio_chip *chip,
@@ -123,7 +123,7 @@ static int sama5d2_piobu_get_direction(struct gpio_chip *chip,
 				   GPIO_LINE_DIRECTION_OUT;
 }
 
-/**
+/*
  * sama5d2_piobu_direction_input() - gpiochip direction_input
  */
 static int sama5d2_piobu_direction_input(struct gpio_chip *chip,
@@ -132,7 +132,7 @@ static int sama5d2_piobu_direction_input(struct gpio_chip *chip,
 	return sama5d2_piobu_write_value(chip, pin, PIOBU_DIRECTION, PIOBU_IN);
 }
 
-/**
+/*
  * sama5d2_piobu_direction_output() - gpiochip direction_output
  */
 static int sama5d2_piobu_direction_output(struct gpio_chip *chip,
@@ -147,7 +147,7 @@ static int sama5d2_piobu_direction_output(struct gpio_chip *chip,
 					 val);
 }
 
-/**
+/*
  * sama5d2_piobu_get() - gpiochip get
  */
 static int sama5d2_piobu_get(struct gpio_chip *chip, unsigned int pin)
@@ -166,7 +166,7 @@ static int sama5d2_piobu_get(struct gpio_chip *chip, unsigned int pin)
 	return !!ret;
 }
 
-/**
+/*
  * sama5d2_piobu_set() - gpiochip set
  */
 static void sama5d2_piobu_set(struct gpio_chip *chip, unsigned int pin,

drivers/gpio/gpio-sch.c

@@ -26,10 +26,10 @@ struct sch_gpio {
 	unsigned short resume_base;
 };
 
-static unsigned sch_gpio_offset(struct sch_gpio *sch, unsigned gpio,
-				unsigned reg)
+static unsigned int sch_gpio_offset(struct sch_gpio *sch, unsigned int gpio,
+				unsigned int reg)
 {
-	unsigned base = 0;
+	unsigned int base = 0;
 
 	if (gpio >= sch->resume_base) {
 		gpio -= sch->resume_base;
@@ -39,14 +39,14 @@ static unsigned sch_gpio_offset(struct sch_gpio *sch, unsigned gpio,
 	return base + reg + gpio / 8;
 }
 
-static unsigned sch_gpio_bit(struct sch_gpio *sch, unsigned gpio)
+static unsigned int sch_gpio_bit(struct sch_gpio *sch, unsigned int gpio)
 {
 	if (gpio >= sch->resume_base)
 		gpio -= sch->resume_base;
 	return gpio % 8;
 }
 
-static int sch_gpio_reg_get(struct sch_gpio *sch, unsigned gpio, unsigned reg)
+static int sch_gpio_reg_get(struct sch_gpio *sch, unsigned int gpio, unsigned int reg)
 {
 	unsigned short offset, bit;
 	u8 reg_val;
@@ -59,7 +59,7 @@ static int sch_gpio_reg_get(struct sch_gpio *sch, unsigned gpio, unsigned reg)
 	return reg_val;
 }
 
-static void sch_gpio_reg_set(struct sch_gpio *sch, unsigned gpio, unsigned reg,
+static void sch_gpio_reg_set(struct sch_gpio *sch, unsigned int gpio, unsigned int reg,
 			     int val)
 {
 	unsigned short offset, bit;
@@ -76,7 +76,7 @@ static void sch_gpio_reg_set(struct sch_gpio *sch, unsigned gpio, unsigned reg,
 		outb((reg_val & ~BIT(bit)), sch->iobase + offset);
 }
 
-static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
+static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned int gpio_num)
 {
 	struct sch_gpio *sch = gpiochip_get_data(gc);
 
@@ -86,13 +86,14 @@ static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
 	return 0;
 }
 
-static int sch_gpio_get(struct gpio_chip *gc, unsigned gpio_num)
+static int sch_gpio_get(struct gpio_chip *gc, unsigned int gpio_num)
 {
 	struct sch_gpio *sch = gpiochip_get_data(gc);
+
 	return sch_gpio_reg_get(sch, gpio_num, GLV);
 }
 
-static void sch_gpio_set(struct gpio_chip *gc, unsigned gpio_num, int val)
+static void sch_gpio_set(struct gpio_chip *gc, unsigned int gpio_num, int val)
 {
 	struct sch_gpio *sch = gpiochip_get_data(gc);
 
@@ -101,7 +102,7 @@ static void sch_gpio_set(struct gpio_chip *gc, unsigned gpio_num, int val)
 	spin_unlock(&sch->lock);
 }
 
-static int sch_gpio_direction_out(struct gpio_chip *gc, unsigned gpio_num,
+static int sch_gpio_direction_out(struct gpio_chip *gc, unsigned int gpio_num,
 				  int val)
 {
 	struct sch_gpio *sch = gpiochip_get_data(gc);
@@ -123,7 +124,7 @@ static int sch_gpio_direction_out(struct gpio_chip *gc, unsigned gpio_num,
 	return 0;
 }
 
-static int sch_gpio_get_direction(struct gpio_chip *gc, unsigned gpio_num)
+static int sch_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio_num)
 {
 	struct sch_gpio *sch = gpiochip_get_data(gc);
 

drivers/gpio/gpio-stmpe.c

@@ -500,13 +500,9 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_free;
 
-	ret = gpiochip_add_data(&stmpe_gpio->chip, stmpe_gpio);
-	if (ret) {
-		dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
-		goto out_disable;
-	}
-
 	if (irq > 0) {
+		struct gpio_irq_chip *girq;
+
 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 				stmpe_gpio_irq, IRQF_ONESHOT,
 				"stmpe-gpio", stmpe_gpio);
@@ -514,20 +510,22 @@ static int stmpe_gpio_probe(struct platform_device *pdev)
 			dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
 			goto out_disable;
 		}
-		ret =  gpiochip_irqchip_add_nested(&stmpe_gpio->chip,
-						   &stmpe_gpio_irq_chip,
-						   0,
-						   handle_simple_irq,
-						   IRQ_TYPE_NONE);
-		if (ret) {
-			dev_err(&pdev->dev,
-				"could not connect irqchip to gpiochip\n");
-			goto out_disable;
+
+		girq = &stmpe_gpio->chip.irq;
+		girq->chip = &stmpe_gpio_irq_chip;
+		/* This will let us handle the parent IRQ in the driver */
+		girq->parent_handler = NULL;
+		girq->num_parents = 0;
+		girq->parents = NULL;
+		girq->default_type = IRQ_TYPE_NONE;
+		girq->handler = handle_simple_irq;
+		girq->threaded = true;
 	}
 
-		gpiochip_set_nested_irqchip(&stmpe_gpio->chip,
-					    &stmpe_gpio_irq_chip,
-					    irq);
+	ret = gpiochip_add_data(&stmpe_gpio->chip, stmpe_gpio);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
+		goto out_disable;
 	}
 
 	platform_set_drvdata(pdev, stmpe_gpio);

drivers/gpio/gpio-syscon.c

@@ -24,16 +24,16 @@
 
 /**
  * struct syscon_gpio_data - Configuration for the device.
- * compatible:		SYSCON driver compatible string.
- * flags:		Set of GPIO_SYSCON_FEAT_ flags:
+ * @compatible:		SYSCON driver compatible string.
+ * @flags:		Set of GPIO_SYSCON_FEAT_ flags:
  *			GPIO_SYSCON_FEAT_IN:	GPIOs supports input,
  *			GPIO_SYSCON_FEAT_OUT:	GPIOs supports output,
  *			GPIO_SYSCON_FEAT_DIR:	GPIOs supports switch direction.
- * bit_count:		Number of bits used as GPIOs.
- * dat_bit_offset:	Offset (in bits) to the first GPIO bit.
- * dir_bit_offset:	Optional offset (in bits) to the first bit to switch
+ * @bit_count:		Number of bits used as GPIOs.
+ * @dat_bit_offset:	Offset (in bits) to the first GPIO bit.
+ * @dir_bit_offset:	Optional offset (in bits) to the first bit to switch
  *			GPIO direction (Used with GPIO_SYSCON_FEAT_DIR flag).
- * set:		HW specific callback to assigns output value
+ * @set:		HW specific callback to assigns output value
  *			for signal "offset"
  */
 

drivers/gpio/gpio-tc3589x.c

@@ -289,6 +289,7 @@ static int tc3589x_gpio_probe(struct platform_device *pdev)
 	struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
 	struct device_node *np = pdev->dev.of_node;
 	struct tc3589x_gpio *tc3589x_gpio;
+	struct gpio_irq_chip *girq;
 	int ret;
 	int irq;
 
@@ -317,6 +318,16 @@ static int tc3589x_gpio_probe(struct platform_device *pdev)
 	tc3589x_gpio->chip.base = -1;
 	tc3589x_gpio->chip.of_node = np;
 
+	girq = &tc3589x_gpio->chip.irq;
+	girq->chip = &tc3589x_gpio_irq_chip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_simple_irq;
+	girq->threaded = true;
+
 	/* Bring the GPIO module out of reset */
 	ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
 			       TC3589x_RSTCTRL_GPIRST, 0);
@@ -339,21 +350,6 @@ static int tc3589x_gpio_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret =  gpiochip_irqchip_add_nested(&tc3589x_gpio->chip,
-					   &tc3589x_gpio_irq_chip,
-					   0,
-					   handle_simple_irq,
-					   IRQ_TYPE_NONE);
-	if (ret) {
-		dev_err(&pdev->dev,
-			"could not connect irqchip to gpiochip\n");
-		return ret;
-	}
-
-	gpiochip_set_nested_irqchip(&tc3589x_gpio->chip,
-				    &tc3589x_gpio_irq_chip,
-				    irq);
-
 	platform_set_drvdata(pdev, tc3589x_gpio);
 
 	return 0;

drivers/gpio/gpio-wcove.c

@@ -400,6 +400,7 @@ static int wcove_gpio_probe(struct platform_device *pdev)
 	struct wcove_gpio *wg;
 	int virq, ret, irq;
 	struct device *dev;
+	struct gpio_irq_chip *girq;
 
 	/*
 	 * This gpio platform device is created by a mfd device (see
@@ -442,33 +443,34 @@ static int wcove_gpio_probe(struct platform_device *pdev)
 	wg->dev = dev;
 	wg->regmap = pmic->regmap;
 
-	ret = devm_gpiochip_add_data(dev, &wg->chip, wg);
-	if (ret) {
-		dev_err(dev, "Failed to add gpiochip: %d\n", ret);
-		return ret;
-	}
-
-	ret = gpiochip_irqchip_add_nested(&wg->chip, &wcove_irqchip, 0,
-					  handle_simple_irq, IRQ_TYPE_NONE);
-	if (ret) {
-		dev_err(dev, "Failed to add irqchip: %d\n", ret);
-		return ret;
-	}
-
 	virq = regmap_irq_get_virq(wg->regmap_irq_chip, irq);
 	if (virq < 0) {
 		dev_err(dev, "Failed to get virq by irq %d\n", irq);
 		return virq;
 	}
 
-	ret = devm_request_threaded_irq(dev, virq, NULL,
-		wcove_gpio_irq_handler, IRQF_ONESHOT, pdev->name, wg);
+	girq = &wg->chip.irq;
+	girq->chip = &wcove_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_simple_irq;
+	girq->threaded = true;
+
+	ret = devm_request_threaded_irq(dev, virq, NULL, wcove_gpio_irq_handler,
+					IRQF_ONESHOT, pdev->name, wg);
 	if (ret) {
 		dev_err(dev, "Failed to request irq %d\n", virq);
 		return ret;
 	}
 
-	gpiochip_set_nested_irqchip(&wg->chip, &wcove_irqchip, virq);
+	ret = devm_gpiochip_add_data(dev, &wg->chip, wg);
+	if (ret) {
+		dev_err(dev, "Failed to add gpiochip: %d\n", ret);
+		return ret;
+	}
 
 	/* Enable GPIO0 interrupts */
 	ret = regmap_update_bits(wg->regmap, IRQ_MASK_BASE, GPIO_IRQ0_MASK,

drivers/gpio/gpio-ws16c48.c

@@ -365,10 +365,25 @@ static const char *ws16c48_names[WS16C48_NGPIO] = {
 	"Port 5 Bit 4", "Port 5 Bit 5", "Port 5 Bit 6", "Port 5 Bit 7"
 };
 
+static int ws16c48_irq_init_hw(struct gpio_chip *gc)
+{
+	struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(gc);
+
+	/* Disable IRQ by default */
+	outb(0x80, ws16c48gpio->base + 7);
+	outb(0, ws16c48gpio->base + 8);
+	outb(0, ws16c48gpio->base + 9);
+	outb(0, ws16c48gpio->base + 10);
+	outb(0xC0, ws16c48gpio->base + 7);
+
+	return 0;
+}
+
 static int ws16c48_probe(struct device *dev, unsigned int id)
 {
 	struct ws16c48_gpio *ws16c48gpio;
 	const char *const name = dev_name(dev);
+	struct gpio_irq_chip *girq;
 	int err;
 
 	ws16c48gpio = devm_kzalloc(dev, sizeof(*ws16c48gpio), GFP_KERNEL);
@@ -396,6 +411,16 @@ static int ws16c48_probe(struct device *dev, unsigned int id)
 	ws16c48gpio->chip.set_multiple = ws16c48_gpio_set_multiple;
 	ws16c48gpio->base = base[id];
 
+	girq = &ws16c48gpio->chip.irq;
+	girq->chip = &ws16c48_irqchip;
+	/* This will let us handle the parent IRQ in the driver */
+	girq->parent_handler = NULL;
+	girq->num_parents = 0;
+	girq->parents = NULL;
+	girq->default_type = IRQ_TYPE_NONE;
+	girq->handler = handle_edge_irq;
+	girq->init_hw = ws16c48_irq_init_hw;
+
 	raw_spin_lock_init(&ws16c48gpio->lock);
 
 	err = devm_gpiochip_add_data(dev, &ws16c48gpio->chip, ws16c48gpio);
@@ -404,20 +429,6 @@ static int ws16c48_probe(struct device *dev, unsigned int id)
 		return err;
 	}
 
-	/* Disable IRQ by default */
-	outb(0x80, base[id] + 7);
-	outb(0, base[id] + 8);
-	outb(0, base[id] + 9);
-	outb(0, base[id] + 10);
-	outb(0xC0, base[id] + 7);
-
-	err = gpiochip_irqchip_add(&ws16c48gpio->chip, &ws16c48_irqchip, 0,
-		handle_edge_irq, IRQ_TYPE_NONE);
-	if (err) {
-		dev_err(dev, "Could not add irqchip (%d)\n", err);
-		return err;
-	}
-
 	err = devm_request_irq(dev, irq[id], ws16c48_irq_handler, IRQF_SHARED,
 		name, ws16c48gpio);
 	if (err) {

drivers/gpio/gpio-xra1403.c

@@ -121,6 +121,7 @@ static void xra1403_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 	struct xra1403 *xra = gpiochip_get_data(chip);
 	int value[XRA_LAST];
 	int i;
+	const char *label;
 	unsigned int gcr;
 	unsigned int gsr;
 
@@ -136,12 +137,7 @@ static void xra1403_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 
 	gcr = value[XRA_GCR + 1] << 8 | value[XRA_GCR];
 	gsr = value[XRA_GSR + 1] << 8 | value[XRA_GSR];
-	for (i = 0; i < chip->ngpio; i++) {
-		const char *label = gpiochip_is_requested(chip, i);
-
-		if (!label)
-			continue;
-
+	for_each_requested_gpio(chip, i, label) {
 		seq_printf(s, " gpio-%-3d (%-12s) %s %s\n",
 			   chip->base + i, label,
 			   (gcr & BIT(i)) ? "in" : "out",

drivers/gpio/gpio-zynq.c

@@ -10,6 +10,7 @@
 #include <linux/gpio/driver.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -21,6 +22,9 @@
 /* Maximum banks */
 #define ZYNQ_GPIO_MAX_BANK	4
 #define ZYNQMP_GPIO_MAX_BANK	6
+#define VERSAL_GPIO_MAX_BANK	4
+#define PMC_GPIO_MAX_BANK	5
+#define VERSAL_UNUSED_BANKS	2
 
 #define ZYNQ_GPIO_BANK0_NGPIO	32
 #define ZYNQ_GPIO_BANK1_NGPIO	22
@@ -95,6 +99,7 @@
 /* set to differentiate zynq from zynqmp, 0=zynqmp, 1=zynq */
 #define ZYNQ_GPIO_QUIRK_IS_ZYNQ	BIT(0)
 #define GPIO_QUIRK_DATA_RO_BUG	BIT(1)
+#define GPIO_QUIRK_VERSAL	BIT(2)
 
 struct gpio_regs {
 	u32 datamsw[ZYNQMP_GPIO_MAX_BANK];
@@ -116,6 +121,7 @@ struct gpio_regs {
  * @irq:	interrupt for the GPIO device
  * @p_data:	pointer to platform data
  * @context:	context registers
+ * @dirlock:	lock used for direction in/out synchronization
  */
 struct zynq_gpio {
 	struct gpio_chip chip;
@@ -124,6 +130,7 @@ struct zynq_gpio {
 	int irq;
 	const struct zynq_platform_data *p_data;
 	struct gpio_regs context;
+	spinlock_t dirlock; /* lock */
 };
 
 /**
@@ -196,6 +203,8 @@ static inline void zynq_gpio_get_bank_pin(unsigned int pin_num,
 					gpio->p_data->bank_min[bank];
 			return;
 		}
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank = bank + VERSAL_UNUSED_BANKS;
 	}
 
 	/* default */
@@ -297,6 +306,7 @@ static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
 {
 	u32 reg;
 	unsigned int bank_num, bank_pin_num;
+	unsigned long flags;
 	struct zynq_gpio *gpio = gpiochip_get_data(chip);
 
 	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
@@ -310,9 +320,11 @@ static int zynq_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
 		return -EINVAL;
 
 	/* clear the bit in direction mode reg to set the pin as input */
+	spin_lock_irqsave(&gpio->dirlock, flags);
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
 	reg &= ~BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
+	spin_unlock_irqrestore(&gpio->dirlock, flags);
 
 	return 0;
 }
@@ -334,11 +346,13 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
 {
 	u32 reg;
 	unsigned int bank_num, bank_pin_num;
+	unsigned long flags;
 	struct zynq_gpio *gpio = gpiochip_get_data(chip);
 
 	zynq_gpio_get_bank_pin(pin, &bank_num, &bank_pin_num, gpio);
 
 	/* set the GPIO pin as output */
+	spin_lock_irqsave(&gpio->dirlock, flags);
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
 	reg |= BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_DIRM_OFFSET(bank_num));
@@ -347,6 +361,7 @@ static int zynq_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,
 	reg = readl_relaxed(gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
 	reg |= BIT(bank_pin_num);
 	writel_relaxed(reg, gpio->base_addr + ZYNQ_GPIO_OUTEN_OFFSET(bank_num));
+	spin_unlock_irqrestore(&gpio->dirlock, flags);
 
 	/* set the state of the pin */
 	zynq_gpio_set_value(chip, pin, state);
@@ -647,6 +662,8 @@ static void zynq_gpio_irqhandler(struct irq_desc *desc)
 		int_enb = readl_relaxed(gpio->base_addr +
 					ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
 		zynq_gpio_handle_bank_irq(gpio, bank_num, int_sts & ~int_enb);
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 
 	chained_irq_exit(irqchip, desc);
@@ -676,6 +693,8 @@ static void zynq_gpio_save_context(struct zynq_gpio *gpio)
 		gpio->context.int_any[bank_num] =
 				readl_relaxed(gpio->base_addr +
 				ZYNQ_GPIO_INTANY_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 }
 
@@ -707,6 +726,8 @@ static void zynq_gpio_restore_context(struct zynq_gpio *gpio)
 		writel_relaxed(~(gpio->context.int_en[bank_num]),
 			       gpio->base_addr +
 			       ZYNQ_GPIO_INTEN_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
 	}
 }
 
@@ -715,6 +736,9 @@ static int __maybe_unused zynq_gpio_suspend(struct device *dev)
 	struct zynq_gpio *gpio = dev_get_drvdata(dev);
 	struct irq_data *data = irq_get_irq_data(gpio->irq);
 
+	if (!device_may_wakeup(dev))
+		disable_irq(gpio->irq);
+
 	if (!irqd_is_wakeup_set(data)) {
 		zynq_gpio_save_context(gpio);
 		return pm_runtime_force_suspend(dev);
@@ -729,6 +753,9 @@ static int __maybe_unused zynq_gpio_resume(struct device *dev)
 	struct irq_data *data = irq_get_irq_data(gpio->irq);
 	int ret;
 
+	if (!device_may_wakeup(dev))
+		enable_irq(gpio->irq);
+
 	if (!irqd_is_wakeup_set(data)) {
 		ret = pm_runtime_force_resume(dev);
 		zynq_gpio_restore_context(gpio);
@@ -778,6 +805,31 @@ static const struct dev_pm_ops zynq_gpio_dev_pm_ops = {
 			   zynq_gpio_runtime_resume, NULL)
 };
 
+static const struct zynq_platform_data versal_gpio_def = {
+	.label = "versal_gpio",
+	.quirks = GPIO_QUIRK_VERSAL,
+	.ngpio = 58,
+	.max_bank = VERSAL_GPIO_MAX_BANK,
+	.bank_min[0] = 0,
+	.bank_max[0] = 25, /* 0 to 25 are connected to MIOs (26 pins) */
+	.bank_min[3] = 26,
+	.bank_max[3] = 57, /* Bank 3 is connected to FMIOs (32 pins) */
+};
+
+static const struct zynq_platform_data pmc_gpio_def = {
+	.label = "pmc_gpio",
+	.ngpio = 116,
+	.max_bank = PMC_GPIO_MAX_BANK,
+	.bank_min[0] = 0,
+	.bank_max[0] = 25, /* 0 to 25 are connected to MIOs (26 pins) */
+	.bank_min[1] = 26,
+	.bank_max[1] = 51, /* Bank 1 are connected to MIOs (26 pins) */
+	.bank_min[3] = 52,
+	.bank_max[3] = 83, /* Bank 3 is connected to EMIOs (32 pins) */
+	.bank_min[4] = 84,
+	.bank_max[4] = 115, /* Bank 4 is connected to EMIOs (32 pins) */
+};
+
 static const struct zynq_platform_data zynqmp_gpio_def = {
 	.label = "zynqmp_gpio",
 	.quirks = GPIO_QUIRK_DATA_RO_BUG,
@@ -815,6 +867,8 @@ static const struct zynq_platform_data zynq_gpio_def = {
 static const struct of_device_id zynq_gpio_of_match[] = {
 	{ .compatible = "xlnx,zynq-gpio-1.0", .data = &zynq_gpio_def },
 	{ .compatible = "xlnx,zynqmp-gpio-1.0", .data = &zynqmp_gpio_def },
+	{ .compatible = "xlnx,versal-gpio-1.0", .data = &versal_gpio_def },
+	{ .compatible = "xlnx,pmc-gpio-1.0", .data = &pmc_gpio_def },
 	{ /* end of table */ }
 };
 MODULE_DEVICE_TABLE(of, zynq_gpio_of_match);
@@ -876,6 +930,7 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 	/* Retrieve GPIO clock */
 	gpio->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(gpio->clk)) {
+		if (PTR_ERR(gpio->clk) != -EPROBE_DEFER)
 			dev_err(&pdev->dev, "input clock not found.\n");
 		return PTR_ERR(gpio->clk);
 	}
@@ -885,6 +940,8 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	spin_lock_init(&gpio->dirlock);
+
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	ret = pm_runtime_get_sync(&pdev->dev);
@@ -892,9 +949,12 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		goto err_pm_dis;
 
 	/* disable interrupts for all banks */
-	for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++)
+	for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
 		writel_relaxed(ZYNQ_GPIO_IXR_DISABLE_ALL, gpio->base_addr +
 			       ZYNQ_GPIO_INTDIS_OFFSET(bank_num));
+		if (gpio->p_data->quirks & GPIO_QUIRK_VERSAL)
+			bank_num = bank_num + VERSAL_UNUSED_BANKS;
+	}
 
 	/* Set up the GPIO irqchip */
 	girq = &chip->irq;
@@ -919,6 +979,8 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 		goto err_pm_put;
 	}
 
+	irq_set_status_flags(gpio->irq, IRQ_DISABLE_UNLAZY);
+	device_init_wakeup(&pdev->dev, 1);
 	pm_runtime_put(&pdev->dev);
 
 	return 0;

drivers/gpio/gpiolib-cdev.c

+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/anon_inodes.h>
+#include <linux/bitmap.h>
+#include <linux/cdev.h>
+#include <linux/compat.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/file.h>
+#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
+#include <linux/kernel.h>
+#include <linux/kfifo.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/poll.h>
+#include <linux/spinlock.h>
+#include <linux/timekeeping.h>
+#include <linux/uaccess.h>
+#include <uapi/linux/gpio.h>
+
+#include "gpiolib.h"
+#include "gpiolib-cdev.h"
+
+/* Character device interface to GPIO.
+ *
+ * The GPIO character device, /dev/gpiochipN, provides userspace an
+ * interface to gpiolib GPIOs via ioctl()s.
+ */
+
+/*
+ * GPIO line handle management
+ */
+
+/**
+ * struct linehandle_state - contains the state of a userspace handle
+ * @gdev: the GPIO device the handle pertains to
+ * @label: consumer label used to tag descriptors
+ * @descs: the GPIO descriptors held by this handle
+ * @num_descs: the number of descriptors held in the descs array
+ */
+struct linehandle_state {
+	struct gpio_device *gdev;
+	const char *label;
+	struct gpio_desc *descs[GPIOHANDLES_MAX];
+	u32 num_descs;
+};
+
+#define GPIOHANDLE_REQUEST_VALID_FLAGS \
+	(GPIOHANDLE_REQUEST_INPUT | \
+	GPIOHANDLE_REQUEST_OUTPUT | \
+	GPIOHANDLE_REQUEST_ACTIVE_LOW | \
+	GPIOHANDLE_REQUEST_BIAS_PULL_UP | \
+	GPIOHANDLE_REQUEST_BIAS_PULL_DOWN | \
+	GPIOHANDLE_REQUEST_BIAS_DISABLE | \
+	GPIOHANDLE_REQUEST_OPEN_DRAIN | \
+	GPIOHANDLE_REQUEST_OPEN_SOURCE)
+
+static int linehandle_validate_flags(u32 flags)
+{
+	/* Return an error if an unknown flag is set */
+	if (flags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
+		return -EINVAL;
+
+	/*
+	 * Do not allow both INPUT & OUTPUT flags to be set as they are
+	 * contradictory.
+	 */
+	if ((flags & GPIOHANDLE_REQUEST_INPUT) &&
+	    (flags & GPIOHANDLE_REQUEST_OUTPUT))
+		return -EINVAL;
+
+	/*
+	 * Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If
+	 * the hardware actually supports enabling both at the same time the
+	 * electrical result would be disastrous.
+	 */
+	if ((flags & GPIOHANDLE_REQUEST_OPEN_DRAIN) &&
+	    (flags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
+		return -EINVAL;
+
+	/* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
+	if (!(flags & GPIOHANDLE_REQUEST_OUTPUT) &&
+	    ((flags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
+	     (flags & GPIOHANDLE_REQUEST_OPEN_SOURCE)))
+		return -EINVAL;
+
+	/* Bias flags only allowed for input or output mode. */
+	if (!((flags & GPIOHANDLE_REQUEST_INPUT) ||
+	      (flags & GPIOHANDLE_REQUEST_OUTPUT)) &&
+	    ((flags & GPIOHANDLE_REQUEST_BIAS_DISABLE) ||
+	     (flags & GPIOHANDLE_REQUEST_BIAS_PULL_UP) ||
+	     (flags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN)))
+		return -EINVAL;
+
+	/* Only one bias flag can be set. */
+	if (((flags & GPIOHANDLE_REQUEST_BIAS_DISABLE) &&
+	     (flags & (GPIOHANDLE_REQUEST_BIAS_PULL_DOWN |
+		       GPIOHANDLE_REQUEST_BIAS_PULL_UP))) ||
+	    ((flags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN) &&
+	     (flags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)))
+		return -EINVAL;
+
+	return 0;
+}
+
+static void linehandle_flags_to_desc_flags(u32 lflags, unsigned long *flagsp)
+{
+	assign_bit(FLAG_ACTIVE_LOW, flagsp,
+		   lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW);
+	assign_bit(FLAG_OPEN_DRAIN, flagsp,
+		   lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN);
+	assign_bit(FLAG_OPEN_SOURCE, flagsp,
+		   lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE);
+	assign_bit(FLAG_PULL_UP, flagsp,
+		   lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP);
+	assign_bit(FLAG_PULL_DOWN, flagsp,
+		   lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN);
+	assign_bit(FLAG_BIAS_DISABLE, flagsp,
+		   lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE);
+}
+
+static long linehandle_set_config(struct linehandle_state *lh,
+				  void __user *ip)
+{
+	struct gpiohandle_config gcnf;
+	struct gpio_desc *desc;
+	int i, ret;
+	u32 lflags;
+
+	if (copy_from_user(&gcnf, ip, sizeof(gcnf)))
+		return -EFAULT;
+
+	lflags = gcnf.flags;
+	ret = linehandle_validate_flags(lflags);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < lh->num_descs; i++) {
+		desc = lh->descs[i];
+		linehandle_flags_to_desc_flags(gcnf.flags, &desc->flags);
+
+		/*
+		 * Lines have to be requested explicitly for input
+		 * or output, else the line will be treated "as is".
+		 */
+		if (lflags & GPIOHANDLE_REQUEST_OUTPUT) {
+			int val = !!gcnf.default_values[i];
+
+			ret = gpiod_direction_output(desc, val);
+			if (ret)
+				return ret;
+		} else if (lflags & GPIOHANDLE_REQUEST_INPUT) {
+			ret = gpiod_direction_input(desc);
+			if (ret)
+				return ret;
+		}
+
+		blocking_notifier_call_chain(&desc->gdev->notifier,
+					     GPIOLINE_CHANGED_CONFIG, desc);
+	}
+	return 0;
+}
+
+static long linehandle_ioctl(struct file *file, unsigned int cmd,
+			     unsigned long arg)
+{
+	struct linehandle_state *lh = file->private_data;
+	void __user *ip = (void __user *)arg;
+	struct gpiohandle_data ghd;
+	DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
+	int i;
+
+	if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
+		/* NOTE: It's ok to read values of output lines. */
+		int ret = gpiod_get_array_value_complex(false,
+							true,
+							lh->num_descs,
+							lh->descs,
+							NULL,
+							vals);
+		if (ret)
+			return ret;
+
+		memset(&ghd, 0, sizeof(ghd));
+		for (i = 0; i < lh->num_descs; i++)
+			ghd.values[i] = test_bit(i, vals);
+
+		if (copy_to_user(ip, &ghd, sizeof(ghd)))
+			return -EFAULT;
+
+		return 0;
+	} else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) {
+		/*
+		 * All line descriptors were created at once with the same
+		 * flags so just check if the first one is really output.
+		 */
+		if (!test_bit(FLAG_IS_OUT, &lh->descs[0]->flags))
+			return -EPERM;
+
+		if (copy_from_user(&ghd, ip, sizeof(ghd)))
+			return -EFAULT;
+
+		/* Clamp all values to [0,1] */
+		for (i = 0; i < lh->num_descs; i++)
+			__assign_bit(i, vals, ghd.values[i]);
+
+		/* Reuse the array setting function */
+		return gpiod_set_array_value_complex(false,
+						     true,
+						     lh->num_descs,
+						     lh->descs,
+						     NULL,
+						     vals);
+	} else if (cmd == GPIOHANDLE_SET_CONFIG_IOCTL) {
+		return linehandle_set_config(lh, ip);
+	}
+	return -EINVAL;
+}
+
+#ifdef CONFIG_COMPAT
+static long linehandle_ioctl_compat(struct file *file, unsigned int cmd,
+				    unsigned long arg)
+{
+	return linehandle_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static void linehandle_free(struct linehandle_state *lh)
+{
+	int i;
+
+	for (i = 0; i < lh->num_descs; i++)
+		if (lh->descs[i])
+			gpiod_free(lh->descs[i]);
+	kfree(lh->label);
+	put_device(&lh->gdev->dev);
+	kfree(lh);
+}
+
+static int linehandle_release(struct inode *inode, struct file *file)
+{
+	linehandle_free(file->private_data);
+	return 0;
+}
+
+static const struct file_operations linehandle_fileops = {
+	.release = linehandle_release,
+	.owner = THIS_MODULE,
+	.llseek = noop_llseek,
+	.unlocked_ioctl = linehandle_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = linehandle_ioctl_compat,
+#endif
+};
+
+static int linehandle_create(struct gpio_device *gdev, void __user *ip)
+{
+	struct gpiohandle_request handlereq;
+	struct linehandle_state *lh;
+	struct file *file;
+	int fd, i, ret;
+	u32 lflags;
+
+	if (copy_from_user(&handlereq, ip, sizeof(handlereq)))
+		return -EFAULT;
+	if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX))
+		return -EINVAL;
+
+	lflags = handlereq.flags;
+
+	ret = linehandle_validate_flags(lflags);
+	if (ret)
+		return ret;
+
+	lh = kzalloc(sizeof(*lh), GFP_KERNEL);
+	if (!lh)
+		return -ENOMEM;
+	lh->gdev = gdev;
+	get_device(&gdev->dev);
+
+	/* Make sure this is terminated */
+	handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0';
+	if (strlen(handlereq.consumer_label)) {
+		lh->label = kstrdup(handlereq.consumer_label,
+				    GFP_KERNEL);
+		if (!lh->label) {
+			ret = -ENOMEM;
+			goto out_free_lh;
+		}
+	}
+
+	lh->num_descs = handlereq.lines;
+
+	/* Request each GPIO */
+	for (i = 0; i < handlereq.lines; i++) {
+		u32 offset = handlereq.lineoffsets[i];
+		struct gpio_desc *desc = gpiochip_get_desc(gdev->chip, offset);
+
+		if (IS_ERR(desc)) {
+			ret = PTR_ERR(desc);
+			goto out_free_lh;
+		}
+
+		ret = gpiod_request(desc, lh->label);
+		if (ret)
+			goto out_free_lh;
+		lh->descs[i] = desc;
+		linehandle_flags_to_desc_flags(handlereq.flags, &desc->flags);
+
+		ret = gpiod_set_transitory(desc, false);
+		if (ret < 0)
+			goto out_free_lh;
+
+		/*
+		 * Lines have to be requested explicitly for input
+		 * or output, else the line will be treated "as is".
+		 */
+		if (lflags & GPIOHANDLE_REQUEST_OUTPUT) {
+			int val = !!handlereq.default_values[i];
+
+			ret = gpiod_direction_output(desc, val);
+			if (ret)
+				goto out_free_lh;
+		} else if (lflags & GPIOHANDLE_REQUEST_INPUT) {
+			ret = gpiod_direction_input(desc);
+			if (ret)
+				goto out_free_lh;
+		}
+
+		blocking_notifier_call_chain(&desc->gdev->notifier,
+					     GPIOLINE_CHANGED_REQUESTED, desc);
+
+		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
+			offset);
+	}
+
+	fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
+	if (fd < 0) {
+		ret = fd;
+		goto out_free_lh;
+	}
+
+	file = anon_inode_getfile("gpio-linehandle",
+				  &linehandle_fileops,
+				  lh,
+				  O_RDONLY | O_CLOEXEC);
+	if (IS_ERR(file)) {
+		ret = PTR_ERR(file);
+		goto out_put_unused_fd;
+	}
+
+	handlereq.fd = fd;
+	if (copy_to_user(ip, &handlereq, sizeof(handlereq))) {
+		/*
+		 * fput() will trigger the release() callback, so do not go onto
+		 * the regular error cleanup path here.
+		 */
+		fput(file);
+		put_unused_fd(fd);
+		return -EFAULT;
+	}
+
+	fd_install(fd, file);
+
+	dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n",
+		lh->num_descs);
+
+	return 0;
+
+out_put_unused_fd:
+	put_unused_fd(fd);
+out_free_lh:
+	linehandle_free(lh);
+	return ret;
+}
+
+/*
+ * GPIO line event management
+ */
+
+/**
+ * struct lineevent_state - contains the state of a userspace event
+ * @gdev: the GPIO device the event pertains to
+ * @label: consumer label used to tag descriptors
+ * @desc: the GPIO descriptor held by this event
+ * @eflags: the event flags this line was requested with
+ * @irq: the interrupt that trigger in response to events on this GPIO
+ * @wait: wait queue that handles blocking reads of events
+ * @events: KFIFO for the GPIO events
+ * @timestamp: cache for the timestamp storing it between hardirq
+ * and IRQ thread, used to bring the timestamp close to the actual
+ * event
+ */
+struct lineevent_state {
+	struct gpio_device *gdev;
+	const char *label;
+	struct gpio_desc *desc;
+	u32 eflags;
+	int irq;
+	wait_queue_head_t wait;
+	DECLARE_KFIFO(events, struct gpioevent_data, 16);
+	u64 timestamp;
+};
+
+#define GPIOEVENT_REQUEST_VALID_FLAGS \
+	(GPIOEVENT_REQUEST_RISING_EDGE | \
+	GPIOEVENT_REQUEST_FALLING_EDGE)
+
+static __poll_t lineevent_poll(struct file *file,
+			       struct poll_table_struct *wait)
+{
+	struct lineevent_state *le = file->private_data;
+	__poll_t events = 0;
+
+	poll_wait(file, &le->wait, wait);
+
+	if (!kfifo_is_empty_spinlocked_noirqsave(&le->events, &le->wait.lock))
+		events = EPOLLIN | EPOLLRDNORM;
+
+	return events;
+}
+
+
+static ssize_t lineevent_read(struct file *file,
+			      char __user *buf,
+			      size_t count,
+			      loff_t *f_ps)
+{
+	struct lineevent_state *le = file->private_data;
+	struct gpioevent_data ge;
+	ssize_t bytes_read = 0;
+	int ret;
+
+	if (count < sizeof(ge))
+		return -EINVAL;
+
+	do {
+		spin_lock(&le->wait.lock);
+		if (kfifo_is_empty(&le->events)) {
+			if (bytes_read) {
+				spin_unlock(&le->wait.lock);
+				return bytes_read;
+			}
+
+			if (file->f_flags & O_NONBLOCK) {
+				spin_unlock(&le->wait.lock);
+				return -EAGAIN;
+			}
+
+			ret = wait_event_interruptible_locked(le->wait,
+					!kfifo_is_empty(&le->events));
+			if (ret) {
+				spin_unlock(&le->wait.lock);
+				return ret;
+			}
+		}
+
+		ret = kfifo_out(&le->events, &ge, 1);
+		spin_unlock(&le->wait.lock);
+		if (ret != 1) {
+			/*
+			 * This should never happen - we were holding the lock
+			 * from the moment we learned the fifo is no longer
+			 * empty until now.
+			 */
+			ret = -EIO;
+			break;
+		}
+
+		if (copy_to_user(buf + bytes_read, &ge, sizeof(ge)))
+			return -EFAULT;
+		bytes_read += sizeof(ge);
+	} while (count >= bytes_read + sizeof(ge));
+
+	return bytes_read;
+}
+
+static void lineevent_free(struct lineevent_state *le)
+{
+	if (le->irq)
+		free_irq(le->irq, le);
+	if (le->desc)
+		gpiod_free(le->desc);
+	kfree(le->label);
+	put_device(&le->gdev->dev);
+	kfree(le);
+}
+
+static int lineevent_release(struct inode *inode, struct file *file)
+{
+	lineevent_free(file->private_data);
+	return 0;
+}
+
+static long lineevent_ioctl(struct file *file, unsigned int cmd,
+			    unsigned long arg)
+{
+	struct lineevent_state *le = file->private_data;
+	void __user *ip = (void __user *)arg;
+	struct gpiohandle_data ghd;
+
+	/*
+	 * We can get the value for an event line but not set it,
+	 * because it is input by definition.
+	 */
+	if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
+		int val;
+
+		memset(&ghd, 0, sizeof(ghd));
+
+		val = gpiod_get_value_cansleep(le->desc);
+		if (val < 0)
+			return val;
+		ghd.values[0] = val;
+
+		if (copy_to_user(ip, &ghd, sizeof(ghd)))
+			return -EFAULT;
+
+		return 0;
+	}
+	return -EINVAL;
+}
+
+#ifdef CONFIG_COMPAT
+static long lineevent_ioctl_compat(struct file *file, unsigned int cmd,
+				   unsigned long arg)
+{
+	return lineevent_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static const struct file_operations lineevent_fileops = {
+	.release = lineevent_release,
+	.read = lineevent_read,
+	.poll = lineevent_poll,
+	.owner = THIS_MODULE,
+	.llseek = noop_llseek,
+	.unlocked_ioctl = lineevent_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = lineevent_ioctl_compat,
+#endif
+};
+
+static irqreturn_t lineevent_irq_thread(int irq, void *p)
+{
+	struct lineevent_state *le = p;
+	struct gpioevent_data ge;
+	int ret;
+
+	/* Do not leak kernel stack to userspace */
+	memset(&ge, 0, sizeof(ge));
+
+	/*
+	 * We may be running from a nested threaded interrupt in which case
+	 * we didn't get the timestamp from lineevent_irq_handler().
+	 */
+	if (!le->timestamp)
+		ge.timestamp = ktime_get_ns();
+	else
+		ge.timestamp = le->timestamp;
+
+	if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE
+	    && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
+		int level = gpiod_get_value_cansleep(le->desc);
+
+		if (level)
+			/* Emit low-to-high event */
+			ge.id = GPIOEVENT_EVENT_RISING_EDGE;
+		else
+			/* Emit high-to-low event */
+			ge.id = GPIOEVENT_EVENT_FALLING_EDGE;
+	} else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) {
+		/* Emit low-to-high event */
+		ge.id = GPIOEVENT_EVENT_RISING_EDGE;
+	} else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
+		/* Emit high-to-low event */
+		ge.id = GPIOEVENT_EVENT_FALLING_EDGE;
+	} else {
+		return IRQ_NONE;
+	}
+
+	ret = kfifo_in_spinlocked_noirqsave(&le->events, &ge,
+					    1, &le->wait.lock);
+	if (ret)
+		wake_up_poll(&le->wait, EPOLLIN);
+	else
+		pr_debug_ratelimited("event FIFO is full - event dropped\n");
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t lineevent_irq_handler(int irq, void *p)
+{
+	struct lineevent_state *le = p;
+
+	/*
+	 * Just store the timestamp in hardirq context so we get it as
+	 * close in time as possible to the actual event.
+	 */
+	le->timestamp = ktime_get_ns();
+
+	return IRQ_WAKE_THREAD;
+}
+
+static int lineevent_create(struct gpio_device *gdev, void __user *ip)
+{
+	struct gpioevent_request eventreq;
+	struct lineevent_state *le;
+	struct gpio_desc *desc;
+	struct file *file;
+	u32 offset;
+	u32 lflags;
+	u32 eflags;
+	int fd;
+	int ret;
+	int irq, irqflags = 0;
+
+	if (copy_from_user(&eventreq, ip, sizeof(eventreq)))
+		return -EFAULT;
+
+	offset = eventreq.lineoffset;
+	lflags = eventreq.handleflags;
+	eflags = eventreq.eventflags;
+
+	desc = gpiochip_get_desc(gdev->chip, offset);
+	if (IS_ERR(desc))
+		return PTR_ERR(desc);
+
+	/* Return an error if a unknown flag is set */
+	if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) ||
+	    (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS))
+		return -EINVAL;
+
+	/* This is just wrong: we don't look for events on output lines */
+	if ((lflags & GPIOHANDLE_REQUEST_OUTPUT) ||
+	    (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
+	    (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
+		return -EINVAL;
+
+	/* Only one bias flag can be set. */
+	if (((lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE) &&
+	     (lflags & (GPIOHANDLE_REQUEST_BIAS_PULL_DOWN |
+			GPIOHANDLE_REQUEST_BIAS_PULL_UP))) ||
+	    ((lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN) &&
+	     (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)))
+		return -EINVAL;
+
+	le = kzalloc(sizeof(*le), GFP_KERNEL);
+	if (!le)
+		return -ENOMEM;
+	le->gdev = gdev;
+	get_device(&gdev->dev);
+
+	/* Make sure this is terminated */
+	eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0';
+	if (strlen(eventreq.consumer_label)) {
+		le->label = kstrdup(eventreq.consumer_label,
+				    GFP_KERNEL);
+		if (!le->label) {
+			ret = -ENOMEM;
+			goto out_free_le;
+		}
+	}
+
+	ret = gpiod_request(desc, le->label);
+	if (ret)
+		goto out_free_le;
+	le->desc = desc;
+	le->eflags = eflags;
+
+	linehandle_flags_to_desc_flags(lflags, &desc->flags);
+
+	ret = gpiod_direction_input(desc);
+	if (ret)
+		goto out_free_le;
+
+	blocking_notifier_call_chain(&desc->gdev->notifier,
+				     GPIOLINE_CHANGED_REQUESTED, desc);
+
+	irq = gpiod_to_irq(desc);
+	if (irq <= 0) {
+		ret = -ENODEV;
+		goto out_free_le;
+	}
+	le->irq = irq;
+
+	if (eflags & GPIOEVENT_REQUEST_RISING_EDGE)
+		irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
+			IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
+	if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE)
+		irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
+			IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
+	irqflags |= IRQF_ONESHOT;
+
+	INIT_KFIFO(le->events);
+	init_waitqueue_head(&le->wait);
+
+	/* Request a thread to read the events */
+	ret = request_threaded_irq(le->irq,
+				   lineevent_irq_handler,
+				   lineevent_irq_thread,
+				   irqflags,
+				   le->label,
+				   le);
+	if (ret)
+		goto out_free_le;
+
+	fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
+	if (fd < 0) {
+		ret = fd;
+		goto out_free_le;
+	}
+
+	file = anon_inode_getfile("gpio-event",
+				  &lineevent_fileops,
+				  le,
+				  O_RDONLY | O_CLOEXEC);
+	if (IS_ERR(file)) {
+		ret = PTR_ERR(file);
+		goto out_put_unused_fd;
+	}
+
+	eventreq.fd = fd;
+	if (copy_to_user(ip, &eventreq, sizeof(eventreq))) {
+		/*
+		 * fput() will trigger the release() callback, so do not go onto
+		 * the regular error cleanup path here.
+		 */
+		fput(file);
+		put_unused_fd(fd);
+		return -EFAULT;
+	}
+
+	fd_install(fd, file);
+
+	return 0;
+
+out_put_unused_fd:
+	put_unused_fd(fd);
+out_free_le:
+	lineevent_free(le);
+	return ret;
+}
+
+static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
+				  struct gpioline_info *info)
+{
+	struct gpio_chip *gc = desc->gdev->chip;
+	bool ok_for_pinctrl;
+	unsigned long flags;
+
+	/*
+	 * This function takes a mutex so we must check this before taking
+	 * the spinlock.
+	 *
+	 * FIXME: find a non-racy way to retrieve this information. Maybe a
+	 * lock common to both frameworks?
+	 */
+	ok_for_pinctrl =
+		pinctrl_gpio_can_use_line(gc->base + info->line_offset);
+
+	spin_lock_irqsave(&gpio_lock, flags);
+
+	if (desc->name) {
+		strncpy(info->name, desc->name, sizeof(info->name));
+		info->name[sizeof(info->name) - 1] = '\0';
+	} else {
+		info->name[0] = '\0';
+	}
+
+	if (desc->label) {
+		strncpy(info->consumer, desc->label, sizeof(info->consumer));
+		info->consumer[sizeof(info->consumer) - 1] = '\0';
+	} else {
+		info->consumer[0] = '\0';
+	}
+
+	/*
+	 * Userspace only need to know that the kernel is using this GPIO so
+	 * it can't use it.
+	 */
+	info->flags = 0;
+	if (test_bit(FLAG_REQUESTED, &desc->flags) ||
+	    test_bit(FLAG_IS_HOGGED, &desc->flags) ||
+	    test_bit(FLAG_USED_AS_IRQ, &desc->flags) ||
+	    test_bit(FLAG_EXPORT, &desc->flags) ||
+	    test_bit(FLAG_SYSFS, &desc->flags) ||
+	    !ok_for_pinctrl)
+		info->flags |= GPIOLINE_FLAG_KERNEL;
+	if (test_bit(FLAG_IS_OUT, &desc->flags))
+		info->flags |= GPIOLINE_FLAG_IS_OUT;
+	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
+		info->flags |= GPIOLINE_FLAG_ACTIVE_LOW;
+	if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
+		info->flags |= (GPIOLINE_FLAG_OPEN_DRAIN |
+				GPIOLINE_FLAG_IS_OUT);
+	if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
+		info->flags |= (GPIOLINE_FLAG_OPEN_SOURCE |
+				GPIOLINE_FLAG_IS_OUT);
+	if (test_bit(FLAG_BIAS_DISABLE, &desc->flags))
+		info->flags |= GPIOLINE_FLAG_BIAS_DISABLE;
+	if (test_bit(FLAG_PULL_DOWN, &desc->flags))
+		info->flags |= GPIOLINE_FLAG_BIAS_PULL_DOWN;
+	if (test_bit(FLAG_PULL_UP, &desc->flags))
+		info->flags |= GPIOLINE_FLAG_BIAS_PULL_UP;
+
+	spin_unlock_irqrestore(&gpio_lock, flags);
+}
+
+struct gpio_chardev_data {
+	struct gpio_device *gdev;
+	wait_queue_head_t wait;
+	DECLARE_KFIFO(events, struct gpioline_info_changed, 32);
+	struct notifier_block lineinfo_changed_nb;
+	unsigned long *watched_lines;
+};
+
+/*
+ * gpio_ioctl() - ioctl handler for the GPIO chardev
+ */
+static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct gpio_chardev_data *cdev = file->private_data;
+	struct gpio_device *gdev = cdev->gdev;
+	struct gpio_chip *gc = gdev->chip;
+	void __user *ip = (void __user *)arg;
+	struct gpio_desc *desc;
+	__u32 offset;
+
+	/* We fail any subsequent ioctl():s when the chip is gone */
+	if (!gc)
+		return -ENODEV;
+
+	/* Fill in the struct and pass to userspace */
+	if (cmd == GPIO_GET_CHIPINFO_IOCTL) {
+		struct gpiochip_info chipinfo;
+
+		memset(&chipinfo, 0, sizeof(chipinfo));
+
+		strncpy(chipinfo.name, dev_name(&gdev->dev),
+			sizeof(chipinfo.name));
+		chipinfo.name[sizeof(chipinfo.name)-1] = '\0';
+		strncpy(chipinfo.label, gdev->label,
+			sizeof(chipinfo.label));
+		chipinfo.label[sizeof(chipinfo.label)-1] = '\0';
+		chipinfo.lines = gdev->ngpio;
+		if (copy_to_user(ip, &chipinfo, sizeof(chipinfo)))
+			return -EFAULT;
+		return 0;
+	} else if (cmd == GPIO_GET_LINEINFO_IOCTL) {
+		struct gpioline_info lineinfo;
+
+		if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
+			return -EFAULT;
+
+		/* this doubles as a range check on line_offset */
+		desc = gpiochip_get_desc(gc, lineinfo.line_offset);
+		if (IS_ERR(desc))
+			return PTR_ERR(desc);
+
+		gpio_desc_to_lineinfo(desc, &lineinfo);
+
+		if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
+			return -EFAULT;
+		return 0;
+	} else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) {
+		return linehandle_create(gdev, ip);
+	} else if (cmd == GPIO_GET_LINEEVENT_IOCTL) {
+		return lineevent_create(gdev, ip);
+	} else if (cmd == GPIO_GET_LINEINFO_WATCH_IOCTL) {
+		struct gpioline_info lineinfo;
+
+		if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
+			return -EFAULT;
+
+		/* this doubles as a range check on line_offset */
+		desc = gpiochip_get_desc(gc, lineinfo.line_offset);
+		if (IS_ERR(desc))
+			return PTR_ERR(desc);
+
+		if (test_and_set_bit(lineinfo.line_offset, cdev->watched_lines))
+			return -EBUSY;
+
+		gpio_desc_to_lineinfo(desc, &lineinfo);
+
+		if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) {
+			clear_bit(lineinfo.line_offset, cdev->watched_lines);
+			return -EFAULT;
+		}
+
+		return 0;
+	} else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) {
+		if (copy_from_user(&offset, ip, sizeof(offset)))
+			return -EFAULT;
+
+		if (offset >= cdev->gdev->ngpio)
+			return -EINVAL;
+
+		if (!test_and_clear_bit(offset, cdev->watched_lines))
+			return -EBUSY;
+
+		return 0;
+	}
+	return -EINVAL;
+}
+
+#ifdef CONFIG_COMPAT
+static long gpio_ioctl_compat(struct file *file, unsigned int cmd,
+			      unsigned long arg)
+{
+	return gpio_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+static struct gpio_chardev_data *
+to_gpio_chardev_data(struct notifier_block *nb)
+{
+	return container_of(nb, struct gpio_chardev_data, lineinfo_changed_nb);
+}
+
+static int lineinfo_changed_notify(struct notifier_block *nb,
+				   unsigned long action, void *data)
+{
+	struct gpio_chardev_data *cdev = to_gpio_chardev_data(nb);
+	struct gpioline_info_changed chg;
+	struct gpio_desc *desc = data;
+	int ret;
+
+	if (!test_bit(gpio_chip_hwgpio(desc), cdev->watched_lines))
+		return NOTIFY_DONE;
+
+	memset(&chg, 0, sizeof(chg));
+	chg.info.line_offset = gpio_chip_hwgpio(desc);
+	chg.event_type = action;
+	chg.timestamp = ktime_get_ns();
+	gpio_desc_to_lineinfo(desc, &chg.info);
+
+	ret = kfifo_in_spinlocked(&cdev->events, &chg, 1, &cdev->wait.lock);
+	if (ret)
+		wake_up_poll(&cdev->wait, EPOLLIN);
+	else
+		pr_debug_ratelimited("lineinfo event FIFO is full - event dropped\n");
+
+	return NOTIFY_OK;
+}
+
+static __poll_t lineinfo_watch_poll(struct file *file,
+				    struct poll_table_struct *pollt)
+{
+	struct gpio_chardev_data *cdev = file->private_data;
+	__poll_t events = 0;
+
+	poll_wait(file, &cdev->wait, pollt);
+
+	if (!kfifo_is_empty_spinlocked_noirqsave(&cdev->events,
+						 &cdev->wait.lock))
+		events = EPOLLIN | EPOLLRDNORM;
+
+	return events;
+}
+
+static ssize_t lineinfo_watch_read(struct file *file, char __user *buf,
+				   size_t count, loff_t *off)
+{
+	struct gpio_chardev_data *cdev = file->private_data;
+	struct gpioline_info_changed event;
+	ssize_t bytes_read = 0;
+	int ret;
+
+	if (count < sizeof(event))
+		return -EINVAL;
+
+	do {
+		spin_lock(&cdev->wait.lock);
+		if (kfifo_is_empty(&cdev->events)) {
+			if (bytes_read) {
+				spin_unlock(&cdev->wait.lock);
+				return bytes_read;
+			}
+
+			if (file->f_flags & O_NONBLOCK) {
+				spin_unlock(&cdev->wait.lock);
+				return -EAGAIN;
+			}
+
+			ret = wait_event_interruptible_locked(cdev->wait,
+					!kfifo_is_empty(&cdev->events));
+			if (ret) {
+				spin_unlock(&cdev->wait.lock);
+				return ret;
+			}
+		}
+
+		ret = kfifo_out(&cdev->events, &event, 1);
+		spin_unlock(&cdev->wait.lock);
+		if (ret != 1) {
+			ret = -EIO;
+			break;
+			/* We should never get here. See lineevent_read(). */
+		}
+
+		if (copy_to_user(buf + bytes_read, &event, sizeof(event)))
+			return -EFAULT;
+		bytes_read += sizeof(event);
+	} while (count >= bytes_read + sizeof(event));
+
+	return bytes_read;
+}
+
+/**
+ * gpio_chrdev_open() - open the chardev for ioctl operations
+ * @inode: inode for this chardev
+ * @file: file struct for storing private data
+ * Returns 0 on success
+ */
+static int gpio_chrdev_open(struct inode *inode, struct file *file)
+{
+	struct gpio_device *gdev = container_of(inode->i_cdev,
+						struct gpio_device, chrdev);
+	struct gpio_chardev_data *cdev;
+	int ret = -ENOMEM;
+
+	/* Fail on open if the backing gpiochip is gone */
+	if (!gdev->chip)
+		return -ENODEV;
+
+	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
+	if (!cdev)
+		return -ENOMEM;
+
+	cdev->watched_lines = bitmap_zalloc(gdev->chip->ngpio, GFP_KERNEL);
+	if (!cdev->watched_lines)
+		goto out_free_cdev;
+
+	init_waitqueue_head(&cdev->wait);
+	INIT_KFIFO(cdev->events);
+	cdev->gdev = gdev;
+
+	cdev->lineinfo_changed_nb.notifier_call = lineinfo_changed_notify;
+	ret = blocking_notifier_chain_register(&gdev->notifier,
+					       &cdev->lineinfo_changed_nb);
+	if (ret)
+		goto out_free_bitmap;
+
+	get_device(&gdev->dev);
+	file->private_data = cdev;
+
+	ret = nonseekable_open(inode, file);
+	if (ret)
+		goto out_unregister_notifier;
+
+	return ret;
+
+out_unregister_notifier:
+	blocking_notifier_chain_unregister(&gdev->notifier,
+					   &cdev->lineinfo_changed_nb);
+out_free_bitmap:
+	bitmap_free(cdev->watched_lines);
+out_free_cdev:
+	kfree(cdev);
+	return ret;
+}
+
+/**
+ * gpio_chrdev_release() - close chardev after ioctl operations
+ * @inode: inode for this chardev
+ * @file: file struct for storing private data
+ * Returns 0 on success
+ */
+static int gpio_chrdev_release(struct inode *inode, struct file *file)
+{
+	struct gpio_chardev_data *cdev = file->private_data;
+	struct gpio_device *gdev = cdev->gdev;
+
+	bitmap_free(cdev->watched_lines);
+	blocking_notifier_chain_unregister(&gdev->notifier,
+					   &cdev->lineinfo_changed_nb);
+	put_device(&gdev->dev);
+	kfree(cdev);
+
+	return 0;
+}
+
+static const struct file_operations gpio_fileops = {
+	.release = gpio_chrdev_release,
+	.open = gpio_chrdev_open,
+	.poll = lineinfo_watch_poll,
+	.read = lineinfo_watch_read,
+	.owner = THIS_MODULE,
+	.llseek = no_llseek,
+	.unlocked_ioctl = gpio_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = gpio_ioctl_compat,
+#endif
+};
+
+int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt)
+{
+	int ret;
+
+	cdev_init(&gdev->chrdev, &gpio_fileops);
+	gdev->chrdev.owner = THIS_MODULE;
+	gdev->dev.devt = MKDEV(MAJOR(devt), gdev->id);
+
+	ret = cdev_device_add(&gdev->chrdev, &gdev->dev);
+	if (ret)
+		return ret;
+
+	chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n",
+		 MAJOR(devt), gdev->id);
+
+	return 0;
+}
+
+void gpiolib_cdev_unregister(struct gpio_device *gdev)
+{
+	cdev_device_del(&gdev->chrdev, &gdev->dev);
+}

drivers/gpio/gpiolib-cdev.h

+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef GPIOLIB_CDEV_H
+#define GPIOLIB_CDEV_H
+
+#include <linux/device.h>
+
+int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt);
+void gpiolib_cdev_unregister(struct gpio_device *gdev);
+
+#endif /* GPIOLIB_CDEV_H */

drivers/gpio/gpiolib-devres.c

@@ -487,10 +487,12 @@ static void devm_gpio_chip_release(struct device *dev, void *res)
 }
 
 /**
- * devm_gpiochip_add_data() - Resource managed gpiochip_add_data()
+ * devm_gpiochip_add_data_with_key() - Resource managed gpiochip_add_data_with_key()
  * @dev: pointer to the device that gpio_chip belongs to.
  * @gc: the GPIO chip to register
  * @data: driver-private data associated with this chip
+ * @lock_key: lockdep class for IRQ lock
+ * @request_key: lockdep class for IRQ request
  *
  * Context: potentially before irqs will work
  *
@@ -501,8 +503,9 @@ static void devm_gpio_chip_release(struct device *dev, void *res)
  * gc->base is invalid or already associated with a different chip.
  * Otherwise it returns zero as a success code.
  */
-int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *gc,
-			   void *data)
+int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, void *data,
+				    struct lock_class_key *lock_key,
+				    struct lock_class_key *request_key)
 {
 	struct gpio_chip **ptr;
 	int ret;
@@ -512,7 +515,7 @@ int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *gc,
 	if (!ptr)
 		return -ENOMEM;
 
-	ret = gpiochip_add_data(gc, data);
+	ret = gpiochip_add_data_with_key(gc, data, lock_key, request_key);
 	if (ret < 0) {
 		devres_free(ptr);
 		return ret;
@@ -523,4 +526,4 @@ int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *gc,
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(devm_gpiochip_add_data);
+EXPORT_SYMBOL_GPL(devm_gpiochip_add_data_with_key);

drivers/gpio/gpiolib-of.c

@@ -25,6 +25,9 @@
 
 /**
  * of_gpio_spi_cs_get_count() - special GPIO counting for SPI
+ * @dev:    Consuming device
+ * @con_id: Function within the GPIO consumer
+ *
  * Some elder GPIO controllers need special quirks. Currently we handle
  * the Freescale and PPC GPIO controller with bindings that doesn't use the
  * established "cs-gpios" for chip selects but instead rely on

drivers/gpio/gpiolib-sysfs.c

@@ -11,6 +11,7 @@
 #include <linux/ctype.h>
 
 #include "gpiolib.h"
+#include "gpiolib-sysfs.h"
 
 #define GPIO_IRQF_TRIGGER_FALLING	BIT(0)
 #define GPIO_IRQF_TRIGGER_RISING	BIT(1)
@@ -365,7 +366,7 @@ static DEVICE_ATTR_RW(active_low);
 static umode_t gpio_is_visible(struct kobject *kobj, struct attribute *attr,
 			       int n)
 {
-	struct device *dev = container_of(kobj, struct device, kobj);
+	struct device *dev = kobj_to_dev(kobj);
 	struct gpiod_data *data = dev_get_drvdata(dev);
 	struct gpio_desc *desc = data->desc;
 	umode_t mode = attr->mode;

drivers/gpio/gpiolib-sysfs.h

+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef GPIOLIB_SYSFS_H
+#define GPIOLIB_SYSFS_H
+
+#ifdef CONFIG_GPIO_SYSFS
+
+int gpiochip_sysfs_register(struct gpio_device *gdev);
+void gpiochip_sysfs_unregister(struct gpio_device *gdev);
+
+#else
+
+static inline int gpiochip_sysfs_register(struct gpio_device *gdev)
+{
+	return 0;
+}
+
+static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev)
+{
+}
+
+#endif /* CONFIG_GPIO_SYSFS */
+
+#endif /* GPIOLIB_SYSFS_H */

drivers/gpio/gpiolib.c

@@ -17,20 +17,16 @@
 #include <linux/gpio/driver.h>
 #include <linux/gpio/machine.h>
 #include <linux/pinctrl/consumer.h>
-#include <linux/cdev.h>
 #include <linux/fs.h>
-#include <linux/uaccess.h>
 #include <linux/compat.h>
-#include <linux/anon_inodes.h>
 #include <linux/file.h>
-#include <linux/kfifo.h>
-#include <linux/poll.h>
-#include <linux/timekeeping.h>
 #include <uapi/linux/gpio.h>
 
 #include "gpiolib.h"
 #include "gpiolib-of.h"
 #include "gpiolib-acpi.h"
+#include "gpiolib-cdev.h"
+#include "gpiolib-sysfs.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/gpio.h>
@@ -425,1105 +421,6 @@ bool gpiochip_line_is_valid(const struct gpio_chip *gc,
 }
 EXPORT_SYMBOL_GPL(gpiochip_line_is_valid);
 
-/*
- * GPIO line handle management
- */
-
-/**
- * struct linehandle_state - contains the state of a userspace handle
- * @gdev: the GPIO device the handle pertains to
- * @label: consumer label used to tag descriptors
- * @descs: the GPIO descriptors held by this handle
- * @numdescs: the number of descriptors held in the descs array
- */
-struct linehandle_state {
-	struct gpio_device *gdev;
-	const char *label;
-	struct gpio_desc *descs[GPIOHANDLES_MAX];
-	u32 numdescs;
-};
-
-#define GPIOHANDLE_REQUEST_VALID_FLAGS \
-	(GPIOHANDLE_REQUEST_INPUT | \
-	GPIOHANDLE_REQUEST_OUTPUT | \
-	GPIOHANDLE_REQUEST_ACTIVE_LOW | \
-	GPIOHANDLE_REQUEST_BIAS_PULL_UP | \
-	GPIOHANDLE_REQUEST_BIAS_PULL_DOWN | \
-	GPIOHANDLE_REQUEST_BIAS_DISABLE | \
-	GPIOHANDLE_REQUEST_OPEN_DRAIN | \
-	GPIOHANDLE_REQUEST_OPEN_SOURCE)
-
-static int linehandle_validate_flags(u32 flags)
-{
-	/* Return an error if an unknown flag is set */
-	if (flags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
-		return -EINVAL;
-
-	/*
-	 * Do not allow both INPUT & OUTPUT flags to be set as they are
-	 * contradictory.
-	 */
-	if ((flags & GPIOHANDLE_REQUEST_INPUT) &&
-	    (flags & GPIOHANDLE_REQUEST_OUTPUT))
-		return -EINVAL;
-
-	/*
-	 * Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If
-	 * the hardware actually supports enabling both at the same time the
-	 * electrical result would be disastrous.
-	 */
-	if ((flags & GPIOHANDLE_REQUEST_OPEN_DRAIN) &&
-	    (flags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
-		return -EINVAL;
-
-	/* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
-	if (!(flags & GPIOHANDLE_REQUEST_OUTPUT) &&
-	    ((flags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
-	     (flags & GPIOHANDLE_REQUEST_OPEN_SOURCE)))
-		return -EINVAL;
-
-	/* Bias flags only allowed for input or output mode. */
-	if (!((flags & GPIOHANDLE_REQUEST_INPUT) ||
-	      (flags & GPIOHANDLE_REQUEST_OUTPUT)) &&
-	    ((flags & GPIOHANDLE_REQUEST_BIAS_DISABLE) ||
-	     (flags & GPIOHANDLE_REQUEST_BIAS_PULL_UP) ||
-	     (flags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN)))
-		return -EINVAL;
-
-	/* Only one bias flag can be set. */
-	if (((flags & GPIOHANDLE_REQUEST_BIAS_DISABLE) &&
-	     (flags & (GPIOHANDLE_REQUEST_BIAS_PULL_DOWN |
-			GPIOHANDLE_REQUEST_BIAS_PULL_UP))) ||
-	    ((flags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN) &&
-	     (flags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)))
-		return -EINVAL;
-
-	return 0;
-}
-
-static long linehandle_set_config(struct linehandle_state *lh,
-				  void __user *ip)
-{
-	struct gpiohandle_config gcnf;
-	struct gpio_desc *desc;
-	int i, ret;
-	u32 lflags;
-	unsigned long *flagsp;
-
-	if (copy_from_user(&gcnf, ip, sizeof(gcnf)))
-		return -EFAULT;
-
-	lflags = gcnf.flags;
-	ret = linehandle_validate_flags(lflags);
-	if (ret)
-		return ret;
-
-	for (i = 0; i < lh->numdescs; i++) {
-		desc = lh->descs[i];
-		flagsp = &desc->flags;
-
-		assign_bit(FLAG_ACTIVE_LOW, flagsp,
-			lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW);
-
-		assign_bit(FLAG_OPEN_DRAIN, flagsp,
-			lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN);
-
-		assign_bit(FLAG_OPEN_SOURCE, flagsp,
-			lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE);
-
-		assign_bit(FLAG_PULL_UP, flagsp,
-			lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP);
-
-		assign_bit(FLAG_PULL_DOWN, flagsp,
-			lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN);
-
-		assign_bit(FLAG_BIAS_DISABLE, flagsp,
-			lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE);
-
-		/*
-		 * Lines have to be requested explicitly for input
-		 * or output, else the line will be treated "as is".
-		 */
-		if (lflags & GPIOHANDLE_REQUEST_OUTPUT) {
-			int val = !!gcnf.default_values[i];
-
-			ret = gpiod_direction_output(desc, val);
-			if (ret)
-				return ret;
-		} else if (lflags & GPIOHANDLE_REQUEST_INPUT) {
-			ret = gpiod_direction_input(desc);
-			if (ret)
-				return ret;
-		}
-
-		atomic_notifier_call_chain(&desc->gdev->notifier,
-					   GPIOLINE_CHANGED_CONFIG, desc);
-	}
-	return 0;
-}
-
-static long linehandle_ioctl(struct file *filep, unsigned int cmd,
-			     unsigned long arg)
-{
-	struct linehandle_state *lh = filep->private_data;
-	void __user *ip = (void __user *)arg;
-	struct gpiohandle_data ghd;
-	DECLARE_BITMAP(vals, GPIOHANDLES_MAX);
-	int i;
-
-	if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
-		/* NOTE: It's ok to read values of output lines. */
-		int ret = gpiod_get_array_value_complex(false,
-							true,
-							lh->numdescs,
-							lh->descs,
-							NULL,
-							vals);
-		if (ret)
-			return ret;
-
-		memset(&ghd, 0, sizeof(ghd));
-		for (i = 0; i < lh->numdescs; i++)
-			ghd.values[i] = test_bit(i, vals);
-
-		if (copy_to_user(ip, &ghd, sizeof(ghd)))
-			return -EFAULT;
-
-		return 0;
-	} else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) {
-		/*
-		 * All line descriptors were created at once with the same
-		 * flags so just check if the first one is really output.
-		 */
-		if (!test_bit(FLAG_IS_OUT, &lh->descs[0]->flags))
-			return -EPERM;
-
-		if (copy_from_user(&ghd, ip, sizeof(ghd)))
-			return -EFAULT;
-
-		/* Clamp all values to [0,1] */
-		for (i = 0; i < lh->numdescs; i++)
-			__assign_bit(i, vals, ghd.values[i]);
-
-		/* Reuse the array setting function */
-		return gpiod_set_array_value_complex(false,
-					      true,
-					      lh->numdescs,
-					      lh->descs,
-					      NULL,
-					      vals);
-	} else if (cmd == GPIOHANDLE_SET_CONFIG_IOCTL) {
-		return linehandle_set_config(lh, ip);
-	}
-	return -EINVAL;
-}
-
-#ifdef CONFIG_COMPAT
-static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd,
-			     unsigned long arg)
-{
-	return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg));
-}
-#endif
-
-static int linehandle_release(struct inode *inode, struct file *filep)
-{
-	struct linehandle_state *lh = filep->private_data;
-	struct gpio_device *gdev = lh->gdev;
-	int i;
-
-	for (i = 0; i < lh->numdescs; i++)
-		gpiod_free(lh->descs[i]);
-	kfree(lh->label);
-	kfree(lh);
-	put_device(&gdev->dev);
-	return 0;
-}
-
-static const struct file_operations linehandle_fileops = {
-	.release = linehandle_release,
-	.owner = THIS_MODULE,
-	.llseek = noop_llseek,
-	.unlocked_ioctl = linehandle_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl = linehandle_ioctl_compat,
-#endif
-};
-
-static int linehandle_create(struct gpio_device *gdev, void __user *ip)
-{
-	struct gpiohandle_request handlereq;
-	struct linehandle_state *lh;
-	struct file *file;
-	int fd, i, count = 0, ret;
-	u32 lflags;
-
-	if (copy_from_user(&handlereq, ip, sizeof(handlereq)))
-		return -EFAULT;
-	if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX))
-		return -EINVAL;
-
-	lflags = handlereq.flags;
-
-	ret = linehandle_validate_flags(lflags);
-	if (ret)
-		return ret;
-
-	lh = kzalloc(sizeof(*lh), GFP_KERNEL);
-	if (!lh)
-		return -ENOMEM;
-	lh->gdev = gdev;
-	get_device(&gdev->dev);
-
-	/* Make sure this is terminated */
-	handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0';
-	if (strlen(handlereq.consumer_label)) {
-		lh->label = kstrdup(handlereq.consumer_label,
-				    GFP_KERNEL);
-		if (!lh->label) {
-			ret = -ENOMEM;
-			goto out_free_lh;
-		}
-	}
-
-	/* Request each GPIO */
-	for (i = 0; i < handlereq.lines; i++) {
-		u32 offset = handlereq.lineoffsets[i];
-		struct gpio_desc *desc = gpiochip_get_desc(gdev->chip, offset);
-
-		if (IS_ERR(desc)) {
-			ret = PTR_ERR(desc);
-			goto out_free_descs;
-		}
-
-		ret = gpiod_request(desc, lh->label);
-		if (ret)
-			goto out_free_descs;
-		lh->descs[i] = desc;
-		count = i + 1;
-
-		if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
-			set_bit(FLAG_ACTIVE_LOW, &desc->flags);
-		if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN)
-			set_bit(FLAG_OPEN_DRAIN, &desc->flags);
-		if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)
-			set_bit(FLAG_OPEN_SOURCE, &desc->flags);
-		if (lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE)
-			set_bit(FLAG_BIAS_DISABLE, &desc->flags);
-		if (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN)
-			set_bit(FLAG_PULL_DOWN, &desc->flags);
-		if (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)
-			set_bit(FLAG_PULL_UP, &desc->flags);
-
-		ret = gpiod_set_transitory(desc, false);
-		if (ret < 0)
-			goto out_free_descs;
-
-		/*
-		 * Lines have to be requested explicitly for input
-		 * or output, else the line will be treated "as is".
-		 */
-		if (lflags & GPIOHANDLE_REQUEST_OUTPUT) {
-			int val = !!handlereq.default_values[i];
-
-			ret = gpiod_direction_output(desc, val);
-			if (ret)
-				goto out_free_descs;
-		} else if (lflags & GPIOHANDLE_REQUEST_INPUT) {
-			ret = gpiod_direction_input(desc);
-			if (ret)
-				goto out_free_descs;
-		}
-
-		atomic_notifier_call_chain(&desc->gdev->notifier,
-					   GPIOLINE_CHANGED_REQUESTED, desc);
-
-		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
-			offset);
-	}
-	/* Let i point at the last handle */
-	i--;
-	lh->numdescs = handlereq.lines;
-
-	fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
-	if (fd < 0) {
-		ret = fd;
-		goto out_free_descs;
-	}
-
-	file = anon_inode_getfile("gpio-linehandle",
-				  &linehandle_fileops,
-				  lh,
-				  O_RDONLY | O_CLOEXEC);
-	if (IS_ERR(file)) {
-		ret = PTR_ERR(file);
-		goto out_put_unused_fd;
-	}
-
-	handlereq.fd = fd;
-	if (copy_to_user(ip, &handlereq, sizeof(handlereq))) {
-		/*
-		 * fput() will trigger the release() callback, so do not go onto
-		 * the regular error cleanup path here.
-		 */
-		fput(file);
-		put_unused_fd(fd);
-		return -EFAULT;
-	}
-
-	fd_install(fd, file);
-
-	dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n",
-		lh->numdescs);
-
-	return 0;
-
-out_put_unused_fd:
-	put_unused_fd(fd);
-out_free_descs:
-	for (i = 0; i < count; i++)
-		gpiod_free(lh->descs[i]);
-	kfree(lh->label);
-out_free_lh:
-	kfree(lh);
-	put_device(&gdev->dev);
-	return ret;
-}
-
-/*
- * GPIO line event management
- */
-
-/**
- * struct lineevent_state - contains the state of a userspace event
- * @gdev: the GPIO device the event pertains to
- * @label: consumer label used to tag descriptors
- * @desc: the GPIO descriptor held by this event
- * @eflags: the event flags this line was requested with
- * @irq: the interrupt that trigger in response to events on this GPIO
- * @wait: wait queue that handles blocking reads of events
- * @events: KFIFO for the GPIO events
- * @timestamp: cache for the timestamp storing it between hardirq
- * and IRQ thread, used to bring the timestamp close to the actual
- * event
- */
-struct lineevent_state {
-	struct gpio_device *gdev;
-	const char *label;
-	struct gpio_desc *desc;
-	u32 eflags;
-	int irq;
-	wait_queue_head_t wait;
-	DECLARE_KFIFO(events, struct gpioevent_data, 16);
-	u64 timestamp;
-};
-
-#define GPIOEVENT_REQUEST_VALID_FLAGS \
-	(GPIOEVENT_REQUEST_RISING_EDGE | \
-	GPIOEVENT_REQUEST_FALLING_EDGE)
-
-static __poll_t lineevent_poll(struct file *filep,
-				   struct poll_table_struct *wait)
-{
-	struct lineevent_state *le = filep->private_data;
-	__poll_t events = 0;
-
-	poll_wait(filep, &le->wait, wait);
-
-	if (!kfifo_is_empty_spinlocked_noirqsave(&le->events, &le->wait.lock))
-		events = EPOLLIN | EPOLLRDNORM;
-
-	return events;
-}
-
-
-static ssize_t lineevent_read(struct file *filep,
-			      char __user *buf,
-			      size_t count,
-			      loff_t *f_ps)
-{
-	struct lineevent_state *le = filep->private_data;
-	struct gpioevent_data ge;
-	ssize_t bytes_read = 0;
-	int ret;
-
-	if (count < sizeof(ge))
-		return -EINVAL;
-
-	do {
-		spin_lock(&le->wait.lock);
-		if (kfifo_is_empty(&le->events)) {
-			if (bytes_read) {
-				spin_unlock(&le->wait.lock);
-				return bytes_read;
-			}
-
-			if (filep->f_flags & O_NONBLOCK) {
-				spin_unlock(&le->wait.lock);
-				return -EAGAIN;
-			}
-
-			ret = wait_event_interruptible_locked(le->wait,
-					!kfifo_is_empty(&le->events));
-			if (ret) {
-				spin_unlock(&le->wait.lock);
-				return ret;
-			}
-		}
-
-		ret = kfifo_out(&le->events, &ge, 1);
-		spin_unlock(&le->wait.lock);
-		if (ret != 1) {
-			/*
-			 * This should never happen - we were holding the lock
-			 * from the moment we learned the fifo is no longer
-			 * empty until now.
-			 */
-			ret = -EIO;
-			break;
-		}
-
-		if (copy_to_user(buf + bytes_read, &ge, sizeof(ge)))
-			return -EFAULT;
-		bytes_read += sizeof(ge);
-	} while (count >= bytes_read + sizeof(ge));
-
-	return bytes_read;
-}
-
-static int lineevent_release(struct inode *inode, struct file *filep)
-{
-	struct lineevent_state *le = filep->private_data;
-	struct gpio_device *gdev = le->gdev;
-
-	free_irq(le->irq, le);
-	gpiod_free(le->desc);
-	kfree(le->label);
-	kfree(le);
-	put_device(&gdev->dev);
-	return 0;
-}
-
-static long lineevent_ioctl(struct file *filep, unsigned int cmd,
-			    unsigned long arg)
-{
-	struct lineevent_state *le = filep->private_data;
-	void __user *ip = (void __user *)arg;
-	struct gpiohandle_data ghd;
-
-	/*
-	 * We can get the value for an event line but not set it,
-	 * because it is input by definition.
-	 */
-	if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) {
-		int val;
-
-		memset(&ghd, 0, sizeof(ghd));
-
-		val = gpiod_get_value_cansleep(le->desc);
-		if (val < 0)
-			return val;
-		ghd.values[0] = val;
-
-		if (copy_to_user(ip, &ghd, sizeof(ghd)))
-			return -EFAULT;
-
-		return 0;
-	}
-	return -EINVAL;
-}
-
-#ifdef CONFIG_COMPAT
-static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd,
-				   unsigned long arg)
-{
-	return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg));
-}
-#endif
-
-static const struct file_operations lineevent_fileops = {
-	.release = lineevent_release,
-	.read = lineevent_read,
-	.poll = lineevent_poll,
-	.owner = THIS_MODULE,
-	.llseek = noop_llseek,
-	.unlocked_ioctl = lineevent_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl = lineevent_ioctl_compat,
-#endif
-};
-
-static irqreturn_t lineevent_irq_thread(int irq, void *p)
-{
-	struct lineevent_state *le = p;
-	struct gpioevent_data ge;
-	int ret;
-
-	/* Do not leak kernel stack to userspace */
-	memset(&ge, 0, sizeof(ge));
-
-	/*
-	 * We may be running from a nested threaded interrupt in which case
-	 * we didn't get the timestamp from lineevent_irq_handler().
-	 */
-	if (!le->timestamp)
-		ge.timestamp = ktime_get_ns();
-	else
-		ge.timestamp = le->timestamp;
-
-	if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE
-	    && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
-		int level = gpiod_get_value_cansleep(le->desc);
-		if (level)
-			/* Emit low-to-high event */
-			ge.id = GPIOEVENT_EVENT_RISING_EDGE;
-		else
-			/* Emit high-to-low event */
-			ge.id = GPIOEVENT_EVENT_FALLING_EDGE;
-	} else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) {
-		/* Emit low-to-high event */
-		ge.id = GPIOEVENT_EVENT_RISING_EDGE;
-	} else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
-		/* Emit high-to-low event */
-		ge.id = GPIOEVENT_EVENT_FALLING_EDGE;
-	} else {
-		return IRQ_NONE;
-	}
-
-	ret = kfifo_in_spinlocked_noirqsave(&le->events, &ge,
-					    1, &le->wait.lock);
-	if (ret)
-		wake_up_poll(&le->wait, EPOLLIN);
-	else
-		pr_debug_ratelimited("event FIFO is full - event dropped\n");
-
-	return IRQ_HANDLED;
-}
-
-static irqreturn_t lineevent_irq_handler(int irq, void *p)
-{
-	struct lineevent_state *le = p;
-
-	/*
-	 * Just store the timestamp in hardirq context so we get it as
-	 * close in time as possible to the actual event.
-	 */
-	le->timestamp = ktime_get_ns();
-
-	return IRQ_WAKE_THREAD;
-}
-
-static int lineevent_create(struct gpio_device *gdev, void __user *ip)
-{
-	struct gpioevent_request eventreq;
-	struct lineevent_state *le;
-	struct gpio_desc *desc;
-	struct file *file;
-	u32 offset;
-	u32 lflags;
-	u32 eflags;
-	int fd;
-	int ret;
-	int irqflags = 0;
-
-	if (copy_from_user(&eventreq, ip, sizeof(eventreq)))
-		return -EFAULT;
-
-	offset = eventreq.lineoffset;
-	lflags = eventreq.handleflags;
-	eflags = eventreq.eventflags;
-
-	desc = gpiochip_get_desc(gdev->chip, offset);
-	if (IS_ERR(desc))
-		return PTR_ERR(desc);
-
-	/* Return an error if a unknown flag is set */
-	if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) ||
-	    (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS))
-		return -EINVAL;
-
-	/* This is just wrong: we don't look for events on output lines */
-	if ((lflags & GPIOHANDLE_REQUEST_OUTPUT) ||
-	    (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
-	    (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
-		return -EINVAL;
-
-	/* Only one bias flag can be set. */
-	if (((lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE) &&
-	     (lflags & (GPIOHANDLE_REQUEST_BIAS_PULL_DOWN |
-			GPIOHANDLE_REQUEST_BIAS_PULL_UP))) ||
-	    ((lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN) &&
-	     (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)))
-		return -EINVAL;
-
-	le = kzalloc(sizeof(*le), GFP_KERNEL);
-	if (!le)
-		return -ENOMEM;
-	le->gdev = gdev;
-	get_device(&gdev->dev);
-
-	/* Make sure this is terminated */
-	eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0';
-	if (strlen(eventreq.consumer_label)) {
-		le->label = kstrdup(eventreq.consumer_label,
-				    GFP_KERNEL);
-		if (!le->label) {
-			ret = -ENOMEM;
-			goto out_free_le;
-		}
-	}
-
-	ret = gpiod_request(desc, le->label);
-	if (ret)
-		goto out_free_label;
-	le->desc = desc;
-	le->eflags = eflags;
-
-	if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
-		set_bit(FLAG_ACTIVE_LOW, &desc->flags);
-	if (lflags & GPIOHANDLE_REQUEST_BIAS_DISABLE)
-		set_bit(FLAG_BIAS_DISABLE, &desc->flags);
-	if (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_DOWN)
-		set_bit(FLAG_PULL_DOWN, &desc->flags);
-	if (lflags & GPIOHANDLE_REQUEST_BIAS_PULL_UP)
-		set_bit(FLAG_PULL_UP, &desc->flags);
-
-	ret = gpiod_direction_input(desc);
-	if (ret)
-		goto out_free_desc;
-
-	atomic_notifier_call_chain(&desc->gdev->notifier,
-				   GPIOLINE_CHANGED_REQUESTED, desc);
-
-	le->irq = gpiod_to_irq(desc);
-	if (le->irq <= 0) {
-		ret = -ENODEV;
-		goto out_free_desc;
-	}
-
-	if (eflags & GPIOEVENT_REQUEST_RISING_EDGE)
-		irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
-			IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
-	if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE)
-		irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
-			IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
-	irqflags |= IRQF_ONESHOT;
-
-	INIT_KFIFO(le->events);
-	init_waitqueue_head(&le->wait);
-
-	/* Request a thread to read the events */
-	ret = request_threaded_irq(le->irq,
-			lineevent_irq_handler,
-			lineevent_irq_thread,
-			irqflags,
-			le->label,
-			le);
-	if (ret)
-		goto out_free_desc;
-
-	fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
-	if (fd < 0) {
-		ret = fd;
-		goto out_free_irq;
-	}
-
-	file = anon_inode_getfile("gpio-event",
-				  &lineevent_fileops,
-				  le,
-				  O_RDONLY | O_CLOEXEC);
-	if (IS_ERR(file)) {
-		ret = PTR_ERR(file);
-		goto out_put_unused_fd;
-	}
-
-	eventreq.fd = fd;
-	if (copy_to_user(ip, &eventreq, sizeof(eventreq))) {
-		/*
-		 * fput() will trigger the release() callback, so do not go onto
-		 * the regular error cleanup path here.
-		 */
-		fput(file);
-		put_unused_fd(fd);
-		return -EFAULT;
-	}
-
-	fd_install(fd, file);
-
-	return 0;
-
-out_put_unused_fd:
-	put_unused_fd(fd);
-out_free_irq:
-	free_irq(le->irq, le);
-out_free_desc:
-	gpiod_free(le->desc);
-out_free_label:
-	kfree(le->label);
-out_free_le:
-	kfree(le);
-	put_device(&gdev->dev);
-	return ret;
-}
-
-static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
-				  struct gpioline_info *info)
-{
-	struct gpio_chip *gc = desc->gdev->chip;
-	bool ok_for_pinctrl;
-	unsigned long flags;
-
-	/*
-	 * This function takes a mutex so we must check this before taking
-	 * the spinlock.
-	 *
-	 * FIXME: find a non-racy way to retrieve this information. Maybe a
-	 * lock common to both frameworks?
-	 */
-	ok_for_pinctrl =
-		pinctrl_gpio_can_use_line(gc->base + info->line_offset);
-
-	spin_lock_irqsave(&gpio_lock, flags);
-
-	if (desc->name) {
-		strncpy(info->name, desc->name, sizeof(info->name));
-		info->name[sizeof(info->name) - 1] = '\0';
-	} else {
-		info->name[0] = '\0';
-	}
-
-	if (desc->label) {
-		strncpy(info->consumer, desc->label, sizeof(info->consumer));
-		info->consumer[sizeof(info->consumer) - 1] = '\0';
-	} else {
-		info->consumer[0] = '\0';
-	}
-
-	/*
-	 * Userspace only need to know that the kernel is using this GPIO so
-	 * it can't use it.
-	 */
-	info->flags = 0;
-	if (test_bit(FLAG_REQUESTED, &desc->flags) ||
-	    test_bit(FLAG_IS_HOGGED, &desc->flags) ||
-	    test_bit(FLAG_USED_AS_IRQ, &desc->flags) ||
-	    test_bit(FLAG_EXPORT, &desc->flags) ||
-	    test_bit(FLAG_SYSFS, &desc->flags) ||
-	    !ok_for_pinctrl)
-		info->flags |= GPIOLINE_FLAG_KERNEL;
-	if (test_bit(FLAG_IS_OUT, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_IS_OUT;
-	if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_ACTIVE_LOW;
-	if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
-		info->flags |= (GPIOLINE_FLAG_OPEN_DRAIN |
-				GPIOLINE_FLAG_IS_OUT);
-	if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
-		info->flags |= (GPIOLINE_FLAG_OPEN_SOURCE |
-				GPIOLINE_FLAG_IS_OUT);
-	if (test_bit(FLAG_BIAS_DISABLE, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_BIAS_DISABLE;
-	if (test_bit(FLAG_PULL_DOWN, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_BIAS_PULL_DOWN;
-	if (test_bit(FLAG_PULL_UP, &desc->flags))
-		info->flags |= GPIOLINE_FLAG_BIAS_PULL_UP;
-
-	spin_unlock_irqrestore(&gpio_lock, flags);
-}
-
-struct gpio_chardev_data {
-	struct gpio_device *gdev;
-	wait_queue_head_t wait;
-	DECLARE_KFIFO(events, struct gpioline_info_changed, 32);
-	struct notifier_block lineinfo_changed_nb;
-	unsigned long *watched_lines;
-};
-
-/*
- * gpio_ioctl() - ioctl handler for the GPIO chardev
- */
-static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
-	struct gpio_chardev_data *priv = filp->private_data;
-	struct gpio_device *gdev = priv->gdev;
-	struct gpio_chip *gc = gdev->chip;
-	void __user *ip = (void __user *)arg;
-	struct gpio_desc *desc;
-	__u32 offset;
-	int hwgpio;
-
-	/* We fail any subsequent ioctl():s when the chip is gone */
-	if (!gc)
-		return -ENODEV;
-
-	/* Fill in the struct and pass to userspace */
-	if (cmd == GPIO_GET_CHIPINFO_IOCTL) {
-		struct gpiochip_info chipinfo;
-
-		memset(&chipinfo, 0, sizeof(chipinfo));
-
-		strncpy(chipinfo.name, dev_name(&gdev->dev),
-			sizeof(chipinfo.name));
-		chipinfo.name[sizeof(chipinfo.name)-1] = '\0';
-		strncpy(chipinfo.label, gdev->label,
-			sizeof(chipinfo.label));
-		chipinfo.label[sizeof(chipinfo.label)-1] = '\0';
-		chipinfo.lines = gdev->ngpio;
-		if (copy_to_user(ip, &chipinfo, sizeof(chipinfo)))
-			return -EFAULT;
-		return 0;
-	} else if (cmd == GPIO_GET_LINEINFO_IOCTL) {
-		struct gpioline_info lineinfo;
-
-		if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
-			return -EFAULT;
-
-		desc = gpiochip_get_desc(gc, lineinfo.line_offset);
-		if (IS_ERR(desc))
-			return PTR_ERR(desc);
-
-		hwgpio = gpio_chip_hwgpio(desc);
-
-		gpio_desc_to_lineinfo(desc, &lineinfo);
-
-		if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
-			return -EFAULT;
-		return 0;
-	} else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) {
-		return linehandle_create(gdev, ip);
-	} else if (cmd == GPIO_GET_LINEEVENT_IOCTL) {
-		return lineevent_create(gdev, ip);
-	} else if (cmd == GPIO_GET_LINEINFO_WATCH_IOCTL) {
-		struct gpioline_info lineinfo;
-
-		if (copy_from_user(&lineinfo, ip, sizeof(lineinfo)))
-			return -EFAULT;
-
-		desc = gpiochip_get_desc(gc, lineinfo.line_offset);
-		if (IS_ERR(desc))
-			return PTR_ERR(desc);
-
-		hwgpio = gpio_chip_hwgpio(desc);
-
-		if (test_bit(hwgpio, priv->watched_lines))
-			return -EBUSY;
-
-		gpio_desc_to_lineinfo(desc, &lineinfo);
-
-		if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
-			return -EFAULT;
-
-		set_bit(hwgpio, priv->watched_lines);
-		return 0;
-	} else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) {
-		if (copy_from_user(&offset, ip, sizeof(offset)))
-			return -EFAULT;
-
-		desc = gpiochip_get_desc(gc, offset);
-		if (IS_ERR(desc))
-			return PTR_ERR(desc);
-
-		hwgpio = gpio_chip_hwgpio(desc);
-
-		if (!test_bit(hwgpio, priv->watched_lines))
-			return -EBUSY;
-
-		clear_bit(hwgpio, priv->watched_lines);
-		return 0;
-	}
-	return -EINVAL;
-}
-
-#ifdef CONFIG_COMPAT
-static long gpio_ioctl_compat(struct file *filp, unsigned int cmd,
-			      unsigned long arg)
-{
-	return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
-}
-#endif
-
-static struct gpio_chardev_data *
-to_gpio_chardev_data(struct notifier_block *nb)
-{
-	return container_of(nb, struct gpio_chardev_data, lineinfo_changed_nb);
-}
-
-static int lineinfo_changed_notify(struct notifier_block *nb,
-				   unsigned long action, void *data)
-{
-	struct gpio_chardev_data *priv = to_gpio_chardev_data(nb);
-	struct gpioline_info_changed chg;
-	struct gpio_desc *desc = data;
-	int ret;
-
-	if (!test_bit(gpio_chip_hwgpio(desc), priv->watched_lines))
-		return NOTIFY_DONE;
-
-	memset(&chg, 0, sizeof(chg));
-	chg.info.line_offset = gpio_chip_hwgpio(desc);
-	chg.event_type = action;
-	chg.timestamp = ktime_get_ns();
-	gpio_desc_to_lineinfo(desc, &chg.info);
-
-	ret = kfifo_in_spinlocked(&priv->events, &chg, 1, &priv->wait.lock);
-	if (ret)
-		wake_up_poll(&priv->wait, EPOLLIN);
-	else
-		pr_debug_ratelimited("lineinfo event FIFO is full - event dropped\n");
-
-	return NOTIFY_OK;
-}
-
-static __poll_t lineinfo_watch_poll(struct file *filep,
-				    struct poll_table_struct *pollt)
-{
-	struct gpio_chardev_data *priv = filep->private_data;
-	__poll_t events = 0;
-
-	poll_wait(filep, &priv->wait, pollt);
-
-	if (!kfifo_is_empty_spinlocked_noirqsave(&priv->events,
-						 &priv->wait.lock))
-		events = EPOLLIN | EPOLLRDNORM;
-
-	return events;
-}
-
-static ssize_t lineinfo_watch_read(struct file *filep, char __user *buf,
-				   size_t count, loff_t *off)
-{
-	struct gpio_chardev_data *priv = filep->private_data;
-	struct gpioline_info_changed event;
-	ssize_t bytes_read = 0;
-	int ret;
-
-	if (count < sizeof(event))
-		return -EINVAL;
-
-	do {
-		spin_lock(&priv->wait.lock);
-		if (kfifo_is_empty(&priv->events)) {
-			if (bytes_read) {
-				spin_unlock(&priv->wait.lock);
-				return bytes_read;
-			}
-
-			if (filep->f_flags & O_NONBLOCK) {
-				spin_unlock(&priv->wait.lock);
-				return -EAGAIN;
-			}
-
-			ret = wait_event_interruptible_locked(priv->wait,
-					!kfifo_is_empty(&priv->events));
-			if (ret) {
-				spin_unlock(&priv->wait.lock);
-				return ret;
-			}
-		}
-
-		ret = kfifo_out(&priv->events, &event, 1);
-		spin_unlock(&priv->wait.lock);
-		if (ret != 1) {
-			ret = -EIO;
-			break;
-			/* We should never get here. See lineevent_read(). */
-		}
-
-		if (copy_to_user(buf + bytes_read, &event, sizeof(event)))
-			return -EFAULT;
-		bytes_read += sizeof(event);
-	} while (count >= bytes_read + sizeof(event));
-
-	return bytes_read;
-}
-
-/**
- * gpio_chrdev_open() - open the chardev for ioctl operations
- * @inode: inode for this chardev
- * @filp: file struct for storing private data
- * Returns 0 on success
- */
-static int gpio_chrdev_open(struct inode *inode, struct file *filp)
-{
-	struct gpio_device *gdev = container_of(inode->i_cdev,
-					      struct gpio_device, chrdev);
-	struct gpio_chardev_data *priv;
-	int ret = -ENOMEM;
-
-	/* Fail on open if the backing gpiochip is gone */
-	if (!gdev->chip)
-		return -ENODEV;
-
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	priv->watched_lines = bitmap_zalloc(gdev->chip->ngpio, GFP_KERNEL);
-	if (!priv->watched_lines)
-		goto out_free_priv;
-
-	init_waitqueue_head(&priv->wait);
-	INIT_KFIFO(priv->events);
-	priv->gdev = gdev;
-
-	priv->lineinfo_changed_nb.notifier_call = lineinfo_changed_notify;
-	ret = atomic_notifier_chain_register(&gdev->notifier,
-					     &priv->lineinfo_changed_nb);
-	if (ret)
-		goto out_free_bitmap;
-
-	get_device(&gdev->dev);
-	filp->private_data = priv;
-
-	ret = nonseekable_open(inode, filp);
-	if (ret)
-		goto out_unregister_notifier;
-
-	return ret;
-
-out_unregister_notifier:
-	atomic_notifier_chain_unregister(&gdev->notifier,
-					 &priv->lineinfo_changed_nb);
-out_free_bitmap:
-	bitmap_free(priv->watched_lines);
-out_free_priv:
-	kfree(priv);
-	return ret;
-}
-
-/**
- * gpio_chrdev_release() - close chardev after ioctl operations
- * @inode: inode for this chardev
- * @filp: file struct for storing private data
- * Returns 0 on success
- */
-static int gpio_chrdev_release(struct inode *inode, struct file *filp)
-{
-	struct gpio_chardev_data *priv = filp->private_data;
-	struct gpio_device *gdev = priv->gdev;
-
-	bitmap_free(priv->watched_lines);
-	atomic_notifier_chain_unregister(&gdev->notifier,
-					 &priv->lineinfo_changed_nb);
-	put_device(&gdev->dev);
-	kfree(priv);
-
-	return 0;
-}
-
-static const struct file_operations gpio_fileops = {
-	.release = gpio_chrdev_release,
-	.open = gpio_chrdev_open,
-	.poll = lineinfo_watch_poll,
-	.read = lineinfo_watch_read,
-	.owner = THIS_MODULE,
-	.llseek = no_llseek,
-	.unlocked_ioctl = gpio_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl = gpio_ioctl_compat,
-#endif
-};
-
 static void gpiodevice_release(struct device *dev)
 {
 	struct gpio_device *gdev = dev_get_drvdata(dev);
@@ -1539,17 +436,10 @@ static int gpiochip_setup_dev(struct gpio_device *gdev)
 {
 	int ret;
 
-	cdev_init(&gdev->chrdev, &gpio_fileops);
-	gdev->chrdev.owner = THIS_MODULE;
-	gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id);
-
-	ret = cdev_device_add(&gdev->chrdev, &gdev->dev);
+	ret = gpiolib_cdev_register(gdev, gpio_devt);
 	if (ret)
 		return ret;
 
-	chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n",
-		 MAJOR(gpio_devt), gdev->id);
-
 	ret = gpiochip_sysfs_register(gdev);
 	if (ret)
 		goto err_remove_device;
@@ -1562,7 +452,7 @@ static int gpiochip_setup_dev(struct gpio_device *gdev)
 	return 0;
 
 err_remove_device:
-	cdev_device_del(&gdev->chrdev, &gdev->dev);
+	gpiolib_cdev_unregister(gdev);
 	return ret;
 }
 
@@ -1725,7 +615,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 
 	spin_unlock_irqrestore(&gpio_lock, flags);
 
-	ATOMIC_INIT_NOTIFIER_HEAD(&gdev->notifier);
+	BLOCKING_INIT_NOTIFIER_HEAD(&gdev->notifier);
 
 #ifdef CONFIG_PINCTRL
 	INIT_LIST_HEAD(&gdev->pin_ranges);
@@ -1884,7 +774,7 @@ void gpiochip_remove(struct gpio_chip *gc)
 	 * be removed, else it will be dangling until the last user is
 	 * gone.
 	 */
-	cdev_device_del(&gdev->chrdev, &gdev->dev);
+	gpiolib_cdev_unregister(gdev);
 	put_device(&gdev->dev);
 }
 EXPORT_SYMBOL_GPL(gpiochip_remove);
@@ -3159,7 +2049,7 @@ static bool gpiod_free_commit(struct gpio_desc *desc)
 	}
 
 	spin_unlock_irqrestore(&gpio_lock, flags);
-	atomic_notifier_call_chain(&desc->gdev->notifier,
+	blocking_notifier_call_chain(&desc->gdev->notifier,
 				     GPIOLINE_CHANGED_RELEASED, desc);
 
 	return ret;
@@ -3705,10 +2595,9 @@ int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 			bitmap_xor(value_bitmap, value_bitmap,
 				   array_info->invert_mask, array_size);
 
-		if (bitmap_full(array_info->get_mask, array_size))
-			return 0;
-
 		i = find_first_zero_bit(array_info->get_mask, array_size);
+		if (i == array_size)
+			return 0;
 	} else {
 		array_info = NULL;
 	}
@@ -3989,10 +2878,9 @@ int gpiod_set_array_value_complex(bool raw, bool can_sleep,
 		gpio_chip_set_multiple(array_info->chip, array_info->set_mask,
 				       value_bitmap);
 
-		if (bitmap_full(array_info->set_mask, array_size))
-			return 0;
-
 		i = find_first_zero_bit(array_info->set_mask, array_size);
+		if (i == array_size)
+			return 0;
 	} else {
 		array_info = NULL;
 	}
@@ -5039,7 +3927,7 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
 		return ERR_PTR(ret);
 	}
 
-	atomic_notifier_call_chain(&desc->gdev->notifier,
+	blocking_notifier_call_chain(&desc->gdev->notifier,
 				     GPIOLINE_CHANGED_REQUESTED, desc);
 
 	return desc;
@@ -5107,7 +3995,7 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
 		return ERR_PTR(ret);
 	}
 
-	atomic_notifier_call_chain(&desc->gdev->notifier,
+	blocking_notifier_call_chain(&desc->gdev->notifier,
 				     GPIOLINE_CHANGED_REQUESTED, desc);
 
 	return desc;

drivers/gpio/gpiolib.h

@@ -56,7 +56,7 @@ struct gpio_device {
 	const char		*label;
 	void			*data;
 	struct list_head        list;
-	struct atomic_notifier_head notifier;
+	struct blocking_notifier_head notifier;
 
 #ifdef CONFIG_PINCTRL
 	/*
@@ -175,22 +175,4 @@ static inline int gpio_chip_hwgpio(const struct gpio_desc *desc)
 #define chip_dbg(gc, fmt, ...)					\
 	dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
 
-#ifdef CONFIG_GPIO_SYSFS
-
-int gpiochip_sysfs_register(struct gpio_device *gdev);
-void gpiochip_sysfs_unregister(struct gpio_device *gdev);
-
-#else
-
-static inline int gpiochip_sysfs_register(struct gpio_device *gdev)
-{
-	return 0;
-}
-
-static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev)
-{
-}
-
-#endif /* CONFIG_GPIO_SYSFS */
-
 #endif /* GPIOLIB_H */

drivers/pinctrl/pinctrl-at91.c

@@ -1486,14 +1486,11 @@ static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 	int i;
 	struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
 	void __iomem *pio = at91_gpio->regbase;
+	const char *gpio_label;
 
-	for (i = 0; i < chip->ngpio; i++) {
+	for_each_requested_gpio(chip, i, gpio_label) {
 		unsigned mask = pin_to_mask(i);
-		const char *gpio_label;
 
-		gpio_label = gpiochip_is_requested(chip, i);
-		if (!gpio_label)
-			continue;
 		mode = at91_gpio->ops->get_periph(pio, mask);
 		seq_printf(s, "[%s] GPIO%s%d: ",
 			   gpio_label, chip->label, i);

include/linux/gpio/driver.h

@@ -474,6 +474,22 @@ struct gpio_chip {
 extern const char *gpiochip_is_requested(struct gpio_chip *gc,
 			unsigned int offset);
 
+/**
+ * for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range
+ * @chip:	the chip to query
+ * @i:		loop variable
+ * @base:	first GPIO in the range
+ * @size:	amount of GPIOs to check starting from @base
+ * @label:	label of current GPIO
+ */
+#define for_each_requested_gpio_in_range(chip, i, base, size, label)			\
+	for (i = 0; i < size; i++)							\
+		if ((label = gpiochip_is_requested(chip, base + i)) == NULL) {} else
+
+/* Iterates over all requested GPIO of the given @chip */
+#define for_each_requested_gpio(chip, i, label)						\
+	for_each_requested_gpio_in_range(chip, i, 0, chip->ngpio, label)
+
 /* add/remove chips */
 extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 				      struct lock_class_key *lock_key,
@@ -481,25 +497,25 @@ extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 
 /**
  * gpiochip_add_data() - register a gpio_chip
- * @chip: the chip to register, with chip->base initialized
+ * @gc: the chip to register, with gc->base initialized
  * @data: driver-private data associated with this chip
  *
  * Context: potentially before irqs will work
  *
  * When gpiochip_add_data() is called very early during boot, so that GPIOs
- * can be freely used, the chip->parent device must be registered before
+ * can be freely used, the gc->parent device must be registered before
  * the gpio framework's arch_initcall().  Otherwise sysfs initialization
  * for GPIOs will fail rudely.
  *
  * gpiochip_add_data() must only be called after gpiolib initialization,
  * ie after core_initcall().
  *
- * If chip->base is negative, this requests dynamic assignment of
+ * If gc->base is negative, this requests dynamic assignment of
  * a range of valid GPIOs.
  *
  * Returns:
  * A negative errno if the chip can't be registered, such as because the
- * chip->base is invalid or already associated with a different chip.
+ * gc->base is invalid or already associated with a different chip.
  * Otherwise it returns zero as a success code.
  */
 #ifdef CONFIG_LOCKDEP
@@ -509,8 +525,16 @@ extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 		gpiochip_add_data_with_key(gc, data, &lock_key, \
 					   &request_key);	  \
 	})
+#define devm_gpiochip_add_data(dev, gc, data) ({ \
+		static struct lock_class_key lock_key;	\
+		static struct lock_class_key request_key;	  \
+		devm_gpiochip_add_data_with_key(dev, gc, data, &lock_key, \
+					   &request_key);	  \
+	})
 #else
 #define gpiochip_add_data(gc, data) gpiochip_add_data_with_key(gc, data, NULL, NULL)
+#define devm_gpiochip_add_data(dev, gc, data) \
+	devm_gpiochip_add_data_with_key(dev, gc, data, NULL, NULL)
 #endif /* CONFIG_LOCKDEP */
 
 static inline int gpiochip_add(struct gpio_chip *gc)
@@ -518,8 +542,9 @@ static inline int gpiochip_add(struct gpio_chip *gc)
 	return gpiochip_add_data(gc, NULL);
 }
 extern void gpiochip_remove(struct gpio_chip *gc);
-extern int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *gc,
-				  void *data);
+extern int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, void *data,
+					   struct lock_class_key *lock_key,
+					   struct lock_class_key *request_key);
 
 extern struct gpio_chip *gpiochip_find(void *data,
 			      int (*match)(struct gpio_chip *gc, void *data));

include/linux/gpio/regmap.h

@@ -8,7 +8,7 @@ struct gpio_regmap;
 struct irq_domain;
 struct regmap;
 
-#define GPIO_REGMAP_ADDR_ZERO ((unsigned long)(-1))
+#define GPIO_REGMAP_ADDR_ZERO ((unsigned int)(-1))
 #define GPIO_REGMAP_ADDR(addr) ((addr) ? : GPIO_REGMAP_ADDR_ZERO)
 
 /**

include/uapi/linux/gpio.h

@@ -71,8 +71,8 @@ enum {
  * of a GPIO line
  * @info: updated line information
  * @timestamp: estimate of time of status change occurrence, in nanoseconds
- * and GPIOLINE_CHANGED_CONFIG
  * @event_type: one of GPIOLINE_CHANGED_REQUESTED, GPIOLINE_CHANGED_RELEASED
+ * and GPIOLINE_CHANGED_CONFIG
  *
  * Note: struct gpioline_info embedded here has 32-bit alignment on its own,
  * but it works fine with 64-bit alignment too. With its 72 byte size, we can

tools/gpio/gpio-event-mon.c

@@ -45,7 +45,7 @@ int monitor_device(const char *device_name,
 	if (fd == -1) {
 		ret = -errno;
 		fprintf(stderr, "Failed to open %s\n", chrdev_name);
-		goto exit_close_error;
+		goto exit_free_name;
 	}
 
 	req.lineoffset = line;
@@ -117,6 +117,7 @@ int monitor_device(const char *device_name,
 exit_close_error:
 	if (close(fd) == -1)
 		perror("Failed to close GPIO character device file");
+exit_free_name:
 	free(chrdev_name);
 	return ret;
 }

tools/gpio/gpio-utils.c

@@ -75,7 +75,7 @@ int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
 		ret = -errno;
 		fprintf(stderr, "Failed to open %s, %s\n",
 			chrdev_name, strerror(errno));
-		goto exit_close_error;
+		goto exit_free_name;
 	}
 
 	for (i = 0; i < nlines; i++)
@@ -94,9 +94,9 @@ int gpiotools_request_linehandle(const char *device_name, unsigned int *lines,
 			"GPIO_GET_LINEHANDLE_IOCTL", ret, strerror(errno));
 	}
 
-exit_close_error:
 	if (close(fd) == -1)
 		perror("Failed to close GPIO character device file");
+exit_free_name:
 	free(chrdev_name);
 	return ret < 0 ? ret : req.fd;
 }

tools/gpio/lsgpio.c

@@ -94,7 +94,7 @@ int list_device(const char *device_name)
 	if (fd == -1) {
 		ret = -errno;
 		fprintf(stderr, "Failed to open %s\n", chrdev_name);
-		goto exit_close_error;
+		goto exit_free_name;
 	}
 
 	/* Inspect this GPIO chip */
@@ -141,6 +141,7 @@ int list_device(const char *device_name)
 exit_close_error:
 	if (close(fd) == -1)
 		perror("Failed to close GPIO character device file");
+exit_free_name:
 	free(chrdev_name);
 	return ret;
 }