mfd: Allow to specify max77686 interrupt through DT or platform file also

Presently driver expects irq_gpio pin in platform data and maps it to irq
itself. But we can also directly specify the interrupt in DT or platform file.
Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/max77686-irq.c

@@ -252,21 +252,28 @@ int max77686_irq_init(struct max77686_dev *max77686)
 
 	mutex_init(&max77686->irqlock);
 
-	max77686->irq = gpio_to_irq(max77686->irq_gpio);
-
-	if (debug_mask & MAX77686_DEBUG_IRQ_INT) {
-		ret = gpio_request(max77686->irq_gpio, "pmic_irq");
-		if (ret < 0) {
-			dev_err(max77686->dev,
-				"Failed to request gpio %d with ret: %d\n",
-				max77686->irq_gpio, ret);
-			return IRQ_NONE;
+	if (max77686->irq_gpio && !max77686->irq) {
+		max77686->irq = gpio_to_irq(max77686->irq_gpio);
+
+		if (debug_mask & MAX77686_DEBUG_IRQ_INT) {
+			ret = gpio_request(max77686->irq_gpio, "pmic_irq");
+			if (ret < 0) {
+				dev_err(max77686->dev,
+					"Failed to request gpio %d with ret:"
+					"%d\n",	max77686->irq_gpio, ret);
+				return IRQ_NONE;
+			}
+
+			gpio_direction_input(max77686->irq_gpio);
+			val = gpio_get_value(max77686->irq_gpio);
+			gpio_free(max77686->irq_gpio);
+			pr_info("%s: gpio_irq=%x\n", __func__, val);
 		}
+	}
 
-		gpio_direction_input(max77686->irq_gpio);
-		val = gpio_get_value(max77686->irq_gpio);
-		gpio_free(max77686->irq_gpio);
-		pr_info("%s: gpio_irq=%x\n", __func__, val);
+	if (!max77686->irq) {
+		dev_err(max77686->dev, "irq is not specified\n");
+		return -ENODEV;
 	}
 
 	/* Mask individual interrupt sources */

drivers/mfd/max77686.c

@@ -77,6 +77,7 @@ static int max77686_i2c_probe(struct i2c_client *i2c,
 
 	max77686->wakeup = pdata->wakeup;
 	max77686->irq_gpio = pdata->irq_gpio;
+	max77686->irq = i2c->irq;
 
 	if (regmap_read(max77686->regmap,
 			 MAX77686_REG_DEVICE_ID, &data) < 0) {