[PATCH v2] max77693: added device tree support

[Andrzej Hajda <a.hajda@samsung.com>]

max77693 mfd main device uses only wakeup field
from max77693_platform_data. This field is mapped
to wakeup-source common property in device tree.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
Hi Lee,

Thanks for the review.
Patch corrected according to your suggestion.

Regards
Andrzej
---
v2:
  - platform data takes precedence over DT
---
 Documentation/devicetree/bindings/mfd/max77693.txt |  2 +
 drivers/mfd/max77693.c                             | 50 ++++++++++++++++------
 2 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/max77693.txt b/Documentation/devicetree/bindings/mfd/max77693.txt
index 11921cc..4138ad4 100644
--- a/Documentation/devicetree/bindings/mfd/max77693.txt
+++ b/Documentation/devicetree/bindings/mfd/max77693.txt
@@ -19,6 +19,8 @@ Required properties:
 Optional properties:
 - regulators : The regulators of max77693 have to be instantiated under subnod
   named "regulators" using the following format.
+- wakeup-source : Indicates if the device can wakeup the system from the sleep
+  state.
 
 	regulators {
 		regualtor-compatible = ESAFEOUT1/ESAFEOUT2/CHARGER
diff --git a/drivers/mfd/max77693.c b/drivers/mfd/max77693.c
index 9e60fed..d85663d 100644
--- a/drivers/mfd/max77693.c
+++ b/drivers/mfd/max77693.c
@@ -106,29 +106,41 @@ static const struct regmap_config max77693_regmap_config = {
 	.max_register = MAX77693_PMIC_REG_END,
 };
 
+static int max77693_get_platform_data(struct max77693_dev *max77693,
+				      struct device *dev)
+{
+	struct device_node *node = dev->of_node;
+	struct max77693_platform_data *pdata = dev->platform_data;
+
+	if (pdata) {
+		max77693->wakeup = pdata->wakeup;
+		return 0;
+	}
+
+	if (node) {
+		max77693->wakeup = of_property_read_bool(node, "wakeup-source");
+		return 0;
+	}
+
+	dev_err(dev, "No platform data found.\n");
+	return -EINVAL;
+}
+
 static int max77693_i2c_probe(struct i2c_client *i2c,
 			      const struct i2c_device_id *id)
 {
 	struct max77693_dev *max77693;
-	struct max77693_platform_data *pdata = i2c->dev.platform_data;
 	u8 reg_data;
 	int ret = 0;
 
-	if (!pdata) {
-		dev_err(&i2c->dev, "No platform data found.\n");
-		return -EINVAL;
-	}
-
 	max77693 = devm_kzalloc(&i2c->dev,
 			sizeof(struct max77693_dev), GFP_KERNEL);
 	if (max77693 == NULL)
 		return -ENOMEM;
 
-	i2c_set_clientdata(i2c, max77693);
-	max77693->dev = &i2c->dev;
-	max77693->i2c = i2c;
-	max77693->irq = i2c->irq;
-	max77693->type = id->driver_data;
+	ret = max77693_get_platform_data(max77693, &i2c->dev);
+	if (ret < 0)
+		return ret;
 
 	max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
 	if (IS_ERR(max77693->regmap)) {
@@ -138,7 +150,11 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
-	max77693->wakeup = pdata->wakeup;
+	i2c_set_clientdata(i2c, max77693);
+	max77693->dev = &i2c->dev;
+	max77693->i2c = i2c;
+	max77693->irq = i2c->irq;
+	max77693->type = id->driver_data;
 
 	ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2,
 				&reg_data);
@@ -179,7 +195,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
 	if (ret < 0)
 		goto err_mfd;
 
-	device_init_wakeup(max77693->dev, pdata->wakeup);
+	device_init_wakeup(max77693->dev, max77693->wakeup);
 
 	return ret;
 
@@ -235,11 +251,19 @@ static const struct dev_pm_ops max77693_pm = {
 	.resume = max77693_resume,
 };
 
+#ifdef CONFIG_OF
+static struct of_device_id max77693_dt_match[] = {
+	{.compatible = "maxim,max77693"},
+	{},
+};
+#endif
+
 static struct i2c_driver max77693_i2c_driver = {
 	.driver = {
 		   .name = "max77693",
 		   .owner = THIS_MODULE,
 		   .pm = &max77693_pm,
+		   .of_match_table = of_match_ptr(max77693_dt_match),
 	},
 	.probe = max77693_i2c_probe,
 	.remove = max77693_i2c_remove,
-- 
1.8.1.2