Merge tag 'leds_for_4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds

Pull LED updates from Jacek Anaszewski:
 "LED class drivers improvements:

  leds-pca955x:
   - add Device Tree support and bindings
   - use devm_led_classdev_register()
   - add GPIO support
   - prevent crippled LED class device name
   - check for I2C errors

  leds-gpio:
   - add optional retain-state-shutdown DT property
   - allow LED to retain state at shutdown

  leds-tlc591xx:
   - merge conditional tests
   - add missing of_node_put

  leds-powernv:
   - delete an error message for a failed memory allocation in
     powernv_led_create()

  leds-is31fl32xx.c
   - convert to using custom %pOF printf format specifier

  Constify attribute_group structures in:
   - leds-blinkm
   - leds-lm3533

  Make several arrays static const in:
   - leds-aat1290
   - leds-lp5521
   - leds-lp5562
   - leds-lp8501"

* tag 'leds_for_4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  leds: pca955x: check for I2C errors
  leds: gpio: Allow LED to retain state at shutdown
  dt-bindings: leds: gpio: Add optional retain-state-shutdown property
  leds: powernv: Delete an error message for a failed memory allocation in powernv_led_create()
  leds: lp8501: make several arrays static const
  leds: lp5562: make several arrays static const
  leds: lp5521: make several arrays static const
  leds: aat1290: make array max_mm_current_percent static const
  leds: pca955x: Prevent crippled LED device name
  leds: lm3533: constify attribute_group structure
  dt-bindings: leds: add pca955x
  leds: pca955x: add GPIO support
  leds: pca955x: use devm_led_classdev_register
  leds: pca955x: add device tree support
  leds: Convert to using %pOF instead of full_name
  leds: blinkm: constify attribute_group structures.
  leds: tlc591xx: add missing of_node_put
  leds: tlc591xx: merge conditional tests

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

@@ -18,6 +18,9 @@ LED sub-node properties:
   see Documentation/devicetree/bindings/leds/common.txt
 - retain-state-suspended: (optional) The suspend state can be retained.Such
   as charge-led gpio.
+- retain-state-shutdown: (optional) Retain the state of the LED on shutdown.
+  Useful in BMC systems, for example when the BMC is rebooted while the host
+  remains up.
 - panic-indicator : (optional)
   see Documentation/devicetree/bindings/leds/common.txt
 

Documentation/devicetree/bindings/leds/leds-pca955x.txt

+* NXP - pca955x LED driver
+
+The PCA955x family of chips are I2C LED blinkers whose pins not used
+to control LEDs can be used as general purpose I/Os. The GPIO pins can
+be input or output, and output pins can also be pulse-width controlled.
+
+Required properties:
+- compatible : should be one of :
+	"nxp,pca9550"
+	"nxp,pca9551"
+	"nxp,pca9552"
+	"nxp,pca9553"
+- #address-cells: must be 1
+- #size-cells: must be 0
+- reg: I2C slave address. depends on the model.
+
+Optional properties:
+- gpio-controller: allows pins to be used as GPIOs.
+- #gpio-cells: must be 2.
+- gpio-line-names: define the names of the GPIO lines
+
+LED sub-node properties:
+- reg : number of LED line.
+		from 0 to  1 for the pca9550
+		from 0 to  7 for the pca9551
+		from 0 to 15 for the pca9552
+		from 0 to  3 for the pca9553
+- type: (optional) either
+	PCA9532_TYPE_NONE
+	PCA9532_TYPE_LED
+	PCA9532_TYPE_GPIO
+	see dt-bindings/leds/leds-pca955x.h (default to LED)
+- label : (optional)
+	see Documentation/devicetree/bindings/leds/common.txt
+- linux,default-trigger : (optional)
+	see Documentation/devicetree/bindings/leds/common.txt
+
+Examples:
+
+pca9552: pca9552@60 {
+	compatible = "nxp,pca9552";
+	#address-cells = <1>;
+        #size-cells = <0>;
+	reg = <0x60>;
+
+	gpio-controller;
+	#gpio-cells = <2>;
+	gpio-line-names = "GPIO12", "GPIO13", "GPIO14", "GPIO15";
+
+	gpio@12 {
+		reg = <12>;
+		type = <PCA955X_TYPE_GPIO>;
+	};
+	gpio@13 {
+		reg = <13>;
+		type = <PCA955X_TYPE_GPIO>;
+	};
+	gpio@14 {
+		reg = <14>;
+		type = <PCA955X_TYPE_GPIO>;
+	};
+	gpio@15 {
+		reg = <15>;
+		type = <PCA955X_TYPE_GPIO>;
+	};
+
+	led@0 {
+		label = "red:power";
+		linux,default-trigger = "default-on";
+		reg = <0>;
+		type = <PCA955X_TYPE_LED>;
+	};
+	led@1 {
+		label = "green:power";
+		reg = <1>;
+		type = <PCA955X_TYPE_LED>;
+	};
+	led@2 {
+		label = "pca9552:yellow";
+		reg = <2>;
+		type = <PCA955X_TYPE_LED>;
+	};
+	led@3 {
+		label = "pca9552:white";
+		reg = <3>;
+		type = <PCA955X_TYPE_LED>;
+	};
+};

drivers/leds/Kconfig

@@ -386,6 +386,17 @@ config LEDS_PCA955X
 	  LED driver chips accessed via the I2C bus.  Supported
 	  devices include PCA9550, PCA9551, PCA9552, and PCA9553.
 
+config LEDS_PCA955X_GPIO
+	bool "Enable GPIO support for PCA955X"
+	depends on LEDS_PCA955X
+	depends on GPIOLIB
+	help
+	  Allow unused pins on PCA955X to be used as gpio.
+
+	  To use a pin as gpio the pin type should be set to
+	  PCA955X_TYPE_GPIO in the device tree.
+
+
 config LEDS_PCA963X
 	tristate "LED support for PCA963x I2C chip"
 	depends on LEDS_CLASS

drivers/leds/leds-aat1290.c

@@ -314,8 +314,10 @@ static void aat1290_led_validate_mm_current(struct aat1290_led *led,
 static int init_mm_current_scale(struct aat1290_led *led,
 			struct aat1290_led_config_data *cfg)
 {
-	int max_mm_current_percent[] = { 20, 22, 25, 28, 32, 36, 40, 45, 50, 56,
-						63, 71, 79, 89, 100 };
+	static const int max_mm_current_percent[] = {
+		20, 22, 25, 28, 32, 36, 40, 45, 50, 56,
+		63, 71, 79, 89, 100
+	};
 	int i, max_mm_current =
 			AAT1290_MAX_MM_CURRENT(cfg->max_flash_current);
 

drivers/leds/leds-blinkm.c

@@ -298,7 +298,7 @@ static struct attribute *blinkm_attrs[] = {
 	NULL,
 };
 
-static struct attribute_group blinkm_group = {
+static const struct attribute_group blinkm_group = {
 	.name = "blinkm",
 	.attrs = blinkm_attrs,
 };

drivers/leds/leds-gpio.c

@@ -134,6 +134,8 @@ static int create_gpio_led(const struct gpio_led *template,
 		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
 	if (template->panic_indicator)
 		led_dat->cdev.flags |= LED_PANIC_INDICATOR;
+	if (template->retain_state_shutdown)
+		led_dat->cdev.flags |= LED_RETAIN_AT_SHUTDOWN;
 
 	ret = gpiod_direction_output(led_dat->gpiod, state);
 	if (ret < 0)
@@ -205,6 +207,8 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
 
 		if (fwnode_property_present(child, "retain-state-suspended"))
 			led.retain_state_suspended = 1;
+		if (fwnode_property_present(child, "retain-state-shutdown"))
+			led.retain_state_shutdown = 1;
 		if (fwnode_property_present(child, "panic-indicator"))
 			led.panic_indicator = 1;
 
@@ -267,7 +271,8 @@ static void gpio_led_shutdown(struct platform_device *pdev)
 	for (i = 0; i < priv->num_leds; i++) {
 		struct gpio_led_data *led = &priv->leds[i];
 
-		gpio_led_set(&led->cdev, LED_OFF);
+		if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN))
+			gpio_led_set(&led->cdev, LED_OFF);
 	}
 }
 

drivers/leds/leds-is31fl32xx.c

@@ -348,8 +348,8 @@ static int is31fl32xx_parse_child_dt(const struct device *dev,
 	ret = of_property_read_u32(child, "reg", &reg);
 	if (ret || reg < 1 || reg > led_data->priv->cdef->channels) {
 		dev_err(dev,
-			"Child node %s does not have a valid reg property\n",
-			child->full_name);
+			"Child node %pOF does not have a valid reg property\n",
+			child);
 		return -EINVAL;
 	}
 	led_data->channel = reg;

drivers/leds/leds-lm3533.c

@@ -626,7 +626,7 @@ static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
 	return mode;
 };
 
-static struct attribute_group lm3533_led_attribute_group = {
+static const struct attribute_group lm3533_led_attribute_group = {
 	.is_visible	= lm3533_led_attr_is_visible,
 	.attrs		= lm3533_led_attributes
 };

drivers/leds/leds-lp5521.c

@@ -134,13 +134,13 @@ static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
 static void lp5521_load_engine(struct lp55xx_chip *chip)
 {
 	enum lp55xx_engine_index idx = chip->engine_idx;
-	u8 mask[] = {
+	static const u8 mask[] = {
 		[LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 		[LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 		[LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 	};
 
-	u8 val[] = {
+	static const u8 val[] = {
 		[LP55XX_ENGINE_1] = LP5521_LOAD_R,
 		[LP55XX_ENGINE_2] = LP5521_LOAD_G,
 		[LP55XX_ENGINE_3] = LP5521_LOAD_B,
@@ -160,7 +160,7 @@ static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
 static void lp5521_stop_engine(struct lp55xx_chip *chip)
 {
 	enum lp55xx_engine_index idx = chip->engine_idx;
-	u8 mask[] = {
+	static const u8 mask[] = {
 		[LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 		[LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 		[LP55XX_ENGINE_3] = LP5521_MODE_B_M,
@@ -226,7 +226,7 @@ static int lp5521_update_program_memory(struct lp55xx_chip *chip,
 {
 	enum lp55xx_engine_index idx = chip->engine_idx;
 	u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
-	u8 addr[] = {
+	static const u8 addr[] = {
 		[LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
 		[LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
 		[LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,

drivers/leds/leds-lp5562.c

@@ -116,7 +116,7 @@ static inline void lp5562_wait_enable_done(void)
 
 static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current)
 {
-	u8 addr[] = {
+	static const u8 addr[] = {
 		LP5562_REG_R_CURRENT,
 		LP5562_REG_G_CURRENT,
 		LP5562_REG_B_CURRENT,
@@ -130,13 +130,13 @@ static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current)
 static void lp5562_load_engine(struct lp55xx_chip *chip)
 {
 	enum lp55xx_engine_index idx = chip->engine_idx;
-	u8 mask[] = {
+	static const u8 mask[] = {
 		[LP55XX_ENGINE_1] = LP5562_MODE_ENG1_M,
 		[LP55XX_ENGINE_2] = LP5562_MODE_ENG2_M,
 		[LP55XX_ENGINE_3] = LP5562_MODE_ENG3_M,
 	};
 
-	u8 val[] = {
+	static const u8 val[] = {
 		[LP55XX_ENGINE_1] = LP5562_LOAD_ENG1,
 		[LP55XX_ENGINE_2] = LP5562_LOAD_ENG2,
 		[LP55XX_ENGINE_3] = LP5562_LOAD_ENG3,
@@ -211,7 +211,7 @@ static int lp5562_update_firmware(struct lp55xx_chip *chip,
 {
 	enum lp55xx_engine_index idx = chip->engine_idx;
 	u8 pattern[LP5562_PROGRAM_LENGTH] = {0};
-	u8 addr[] = {
+	static const u8 addr[] = {
 		[LP55XX_ENGINE_1] = LP5562_REG_PROG_MEM_ENG1,
 		[LP55XX_ENGINE_2] = LP5562_REG_PROG_MEM_ENG2,
 		[LP55XX_ENGINE_3] = LP5562_REG_PROG_MEM_ENG3,
@@ -314,7 +314,7 @@ static int lp5562_post_init_device(struct lp55xx_chip *chip)
 static int lp5562_led_brightness(struct lp55xx_led *led)
 {
 	struct lp55xx_chip *chip = led->chip;
-	u8 addr[] = {
+	static const u8 addr[] = {
 		LP5562_REG_R_PWM,
 		LP5562_REG_G_PWM,
 		LP5562_REG_B_PWM,

drivers/leds/leds-lp8501.c

@@ -118,19 +118,19 @@ static int lp8501_post_init_device(struct lp55xx_chip *chip)
 static void lp8501_load_engine(struct lp55xx_chip *chip)
 {
 	enum lp55xx_engine_index idx = chip->engine_idx;
-	u8 mask[] = {
+	static const u8 mask[] = {
 		[LP55XX_ENGINE_1] = LP8501_MODE_ENG1_M,
 		[LP55XX_ENGINE_2] = LP8501_MODE_ENG2_M,
 		[LP55XX_ENGINE_3] = LP8501_MODE_ENG3_M,
 	};
 
-	u8 val[] = {
+	static const u8 val[] = {
 		[LP55XX_ENGINE_1] = LP8501_LOAD_ENG1,
 		[LP55XX_ENGINE_2] = LP8501_LOAD_ENG2,
 		[LP55XX_ENGINE_3] = LP8501_LOAD_ENG3,
 	};
 
-	u8 page_sel[] = {
+	static const u8 page_sel[] = {
 		[LP55XX_ENGINE_1] = LP8501_PAGE_ENG1,
 		[LP55XX_ENGINE_2] = LP8501_PAGE_ENG2,
 		[LP55XX_ENGINE_3] = LP8501_PAGE_ENG3,

drivers/leds/leds-powernv.c

@@ -224,12 +224,8 @@ static int powernv_led_create(struct device *dev,
 	powernv_led->cdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s",
 						powernv_led->loc_code,
 						led_type_desc);
-	if (!powernv_led->cdev.name) {
-		dev_err(dev,
-			"%s: Memory allocation failed for classdev name\n",
-			__func__);
+	if (!powernv_led->cdev.name)
 		return -ENOMEM;
-	}
 
 	powernv_led->cdev.brightness_set_blocking = powernv_brightness_set;
 	powernv_led->cdev.brightness_get = powernv_brightness_get;

drivers/leds/leds-tlc591xx.c

@@ -230,12 +230,15 @@ tlc591xx_probe(struct i2c_client *client,
 
 	for_each_child_of_node(np, child) {
 		err = of_property_read_u32(child, "reg", &reg);
-		if (err)
+		if (err) {
+			of_node_put(child);
 			return err;
-		if (reg < 0 || reg >= tlc591xx->max_leds)
-			return -EINVAL;
-		if (priv->leds[reg].active)
+		}
+		if (reg < 0 || reg >= tlc591xx->max_leds ||
+		    priv->leds[reg].active) {
+			of_node_put(child);
 			return -EINVAL;
+		}
 		priv->leds[reg].active = true;
 		priv->leds[reg].ldev.name =
 			of_get_property(child, "label", NULL) ? : child->name;

include/dt-bindings/leds/leds-pca955x.h

+/*
+ * This header provides constants for pca955x LED bindings.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef _DT_BINDINGS_LEDS_PCA955X_H
+#define _DT_BINDINGS_LEDS_PCA955X_H
+
+#define PCA955X_TYPE_NONE         0
+#define PCA955X_TYPE_LED          1
+#define PCA955X_TYPE_GPIO         2
+
+#endif /* _DT_BINDINGS_LEDS_PCA955X_H */

include/linux/leds.h

@@ -49,6 +49,7 @@ struct led_classdev {
 #define LED_HW_PLUGGABLE	(1 << 19)
 #define LED_PANIC_INDICATOR	(1 << 20)
 #define LED_BRIGHT_HW_CHANGED	(1 << 21)
+#define LED_RETAIN_AT_SHUTDOWN	(1 << 22)
 
 	/* set_brightness_work / blink_timer flags, atomic, private. */
 	unsigned long		work_flags;
@@ -392,6 +393,7 @@ struct gpio_led {
 	unsigned	retain_state_suspended : 1;
 	unsigned	panic_indicator : 1;
 	unsigned	default_state : 2;
+	unsigned	retain_state_shutdown : 1;
 	/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
 	struct gpio_desc *gpiod;
 };