mfd: max8925: Add irqdomain for dt

Add irqdomains for max8925's main irq, wrap irq register operations
into irqdomain's map func. it is necessary for dt support.

Also, add dt support for max8925 driver.
Signed-off-by: Qing Xu <qingx@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/max8925-core.c

@@ -14,10 +14,13 @@
 #include <linux/i2c.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
+#include <linux/irqdomain.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/machine.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/max8925.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
 
 static struct resource bk_resources[] = {
 	{ 0x84, 0x84, "mode control", IORESOURCE_REG, },
@@ -639,17 +642,33 @@ static struct irq_chip max8925_irq_chip = {
 	.irq_disable	= max8925_irq_disable,
 };
 
+static int max8925_irq_domain_map(struct irq_domain *d, unsigned int virq,
+				 irq_hw_number_t hw)
+{
+	irq_set_chip_data(virq, d->host_data);
+	irq_set_chip_and_handler(virq, &max8925_irq_chip, handle_edge_irq);
+	irq_set_nested_thread(virq, 1);
+#ifdef CONFIG_ARM
+	set_irq_flags(virq, IRQF_VALID);
+#else
+	irq_set_noprobe(virq);
+#endif
+	return 0;
+}
+
+static struct irq_domain_ops max8925_irq_domain_ops = {
+	.map	= max8925_irq_domain_map,
+	.xlate	= irq_domain_xlate_onetwocell,
+};
+
+
 static int max8925_irq_init(struct max8925_chip *chip, int irq,
 			    struct max8925_platform_data *pdata)
 {
 	unsigned long flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
-	int i, ret;
-	int __irq;
+	int ret;
+	struct device_node *node = chip->dev->of_node;
 
-	if (!pdata || !pdata->irq_base) {
-		dev_warn(chip->dev, "No interrupt support on IRQ base\n");
-		return -EINVAL;
-	}
 	/* clear all interrupts */
 	max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ1);
 	max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ2);
@@ -667,35 +686,30 @@ static int max8925_irq_init(struct max8925_chip *chip, int irq,
 	max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, 0xff);
 
 	mutex_init(&chip->irq_lock);
-	chip->core_irq = irq;
-	chip->irq_base = pdata->irq_base;
-
-	/* register with genirq */
-	for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
-		__irq = i + chip->irq_base;
-		irq_set_chip_data(__irq, chip);
-		irq_set_chip_and_handler(__irq, &max8925_irq_chip,
-					 handle_edge_irq);
-		irq_set_nested_thread(__irq, 1);
-#ifdef CONFIG_ARM
-		set_irq_flags(__irq, IRQF_VALID);
-#else
-		irq_set_noprobe(__irq);
-#endif
-	}
-	if (!irq) {
-		dev_warn(chip->dev, "No interrupt support on core IRQ\n");
-		goto tsc_irq;
+	chip->irq_base = irq_alloc_descs(-1, 0, MAX8925_NR_IRQS, 0);
+	if (chip->irq_base < 0) {
+		dev_err(chip->dev, "Failed to allocate interrupts, ret:%d\n",
+			chip->irq_base);
+		return -EBUSY;
 	}
 
+	irq_domain_add_legacy(node, MAX8925_NR_IRQS, chip->irq_base, 0,
+			      &max8925_irq_domain_ops, chip);
+
+	/* request irq handler for pmic main irq*/
+	chip->core_irq = irq;
+	if (!chip->core_irq)
+		return -EBUSY;
 	ret = request_threaded_irq(irq, NULL, max8925_irq, flags | IRQF_ONESHOT,
 				   "max8925", chip);
 	if (ret) {
 		dev_err(chip->dev, "Failed to request core IRQ: %d\n", ret);
 		chip->core_irq = 0;
+		return -EBUSY;
 	}
 
-tsc_irq:
+	/* request irq handler for pmic tsc irq*/
+
 	/* mask TSC interrupt */
 	max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, 0x0f);
 
@@ -704,7 +718,6 @@ static int max8925_irq_init(struct max8925_chip *chip, int irq,
 		return 0;
 	}
 	chip->tsc_irq = pdata->tsc_irq;
-
 	ret = request_threaded_irq(chip->tsc_irq, NULL, max8925_tsc_irq,
 				   flags | IRQF_ONESHOT, "max8925-tsc", chip);
 	if (ret) {
@@ -878,8 +891,8 @@ int max8925_device_init(struct max8925_chip *chip,
 				      ARRAY_SIZE(power_devs),
 				      &power_supply_resources[0], 0, NULL);
 		if (ret < 0) {
-			dev_err(chip->dev, "Failed to add power supply "
-				"subdev\n");
+			dev_err(chip->dev,
+				"Failed to add power supply subdev\n");
 			goto out_dev;
 		}
 	}

drivers/mfd/max8925-i2c.c

@@ -135,13 +135,37 @@ static const struct i2c_device_id max8925_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, max8925_id_table);
 
+static int max8925_dt_init(struct device_node *np, struct device *dev,
+			   struct max8925_platform_data *pdata)
+{
+	int ret;
+
+	ret = of_property_read_u32(np, "maxim,tsc-irq", &pdata->tsc_irq);
+	if (ret) {
+		dev_err(dev, "Not found maxim,tsc-irq property\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
 static int max8925_probe(struct i2c_client *client,
 				   const struct i2c_device_id *id)
 {
 	struct max8925_platform_data *pdata = client->dev.platform_data;
 	static struct max8925_chip *chip;
+	struct device_node *node = client->dev.of_node;
+
+	if (node && !pdata) {
+		/* parse DT to get platform data */
+		pdata = devm_kzalloc(&client->dev,
+				     sizeof(struct max8925_platform_data),
+				     GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
 
-	if (!pdata) {
+		if (max8925_dt_init(node, &client->dev, pdata))
+			return -EINVAL;
+	} else if (!pdata) {
 		pr_info("%s: platform data is missing\n", __func__);
 		return -EINVAL;
 	}
@@ -203,11 +227,18 @@ static int max8925_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume);
 
+static const struct of_device_id max8925_dt_ids[] = {
+	{ .compatible = "maxim,max8925", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, max8925_dt_ids);
+
 static struct i2c_driver max8925_driver = {
 	.driver	= {
 		.name	= "max8925",
 		.owner	= THIS_MODULE,
 		.pm     = &max8925_pm_ops,
+		.of_match_table = of_match_ptr(max8925_dt_ids),
 	},
 	.probe		= max8925_probe,
 	.remove		= max8925_remove,
@@ -217,7 +248,6 @@ static struct i2c_driver max8925_driver = {
 static int __init max8925_i2c_init(void)
 {
 	int ret;
-
 	ret = i2c_add_driver(&max8925_driver);
 	if (ret != 0)
 		pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);

include/linux/mfd/max8925.h

@@ -190,6 +190,8 @@ enum {
 	MAX8925_NR_IRQS,
 };
 
+
+
 struct max8925_chip {
 	struct device		*dev;
 	struct i2c_client	*i2c;
@@ -201,7 +203,6 @@ struct max8925_chip {
 	int			irq_base;
 	int			core_irq;
 	int			tsc_irq;
-
 	unsigned int            wakeup_flag;
 };