[PATCH 2/2] regulator: fixed: dt: support for input supply

[Laxman Dewangan <ldewangan@nvidia.com>]

Add support for input supply in DT parsing of node.
The input supply will be provided by the property
"vin-supply" in the regulator node.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
 .../bindings/regulator/fixed-regulator.txt         |    2 ++
 drivers/regulator/fixed.c                          |   12 ++++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/regulator/fixed-regulator.txt b/Documentation/devicetree/bindings/regulator/fixed-regulator.txt
index 2f5b6b1..4fae41d 100644
--- a/Documentation/devicetree/bindings/regulator/fixed-regulator.txt
+++ b/Documentation/devicetree/bindings/regulator/fixed-regulator.txt
@@ -10,6 +10,7 @@ Optional properties:
 If this property is missing, the default assumed is Active low.
 - gpio-open-drain: GPIO is open drain type.
   If this property is missing then default assumption is false.
+-vin-supply: Input supply name.
 
 Any property defined as part of the core regulator
 binding, defined in regulator.txt, can also be used.
@@ -29,4 +30,5 @@ Example:
 		enable-active-high;
 		regulator-boot-on;
 		gpio-open-drain;
+		vin-supply = <&parent_reg>;
 	};
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 0a0baf3..8633e21 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -45,13 +45,14 @@ struct fixed_voltage_data {
 /**
  * of_get_fixed_voltage_config - extract fixed_voltage_config structure info
  * @dev: device requesting for fixed_voltage_config
+ * @vin_supply: pointer to store whether input supply is available or not.
  *
  * Populates fixed_voltage_config structure by extracting data from device
  * tree node, returns a pointer to the populated structure of NULL if memory
  * alloc fails.
  */
 static struct fixed_voltage_config *
-of_get_fixed_voltage_config(struct device *dev)
+of_get_fixed_voltage_config(struct device *dev, bool *vin_supply)
 {
 	struct fixed_voltage_config *config;
 	struct device_node *np = dev->of_node;
@@ -93,6 +94,9 @@ of_get_fixed_voltage_config(struct device *dev)
 	if (of_find_property(np, "gpio-open-drain", NULL))
 		config->gpio_is_open_drain = true;
 
+	if (of_find_property(np, "vin-supply", NULL))
+		*vin_supply = true;
+
 	return config;
 }
 
@@ -171,9 +175,10 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
 	struct fixed_voltage_data *drvdata;
 	struct regulator_config cfg = { };
 	int ret;
+	bool vin_supply = false;
 
 	if (pdev->dev.of_node)
-		config = of_get_fixed_voltage_config(&pdev->dev);
+		config = of_get_fixed_voltage_config(&pdev->dev , &vin_supply);
 	else
 		config = pdev->dev.platform_data;
 
@@ -197,6 +202,9 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
 	drvdata->desc.type = REGULATOR_VOLTAGE;
 	drvdata->desc.owner = THIS_MODULE;
 
+	if (vin_supply)
+		drvdata->desc.supply_name = "vin";
+
 	if (config->microvolts)
 		drvdata->desc.n_voltages = 1;
 
-- 
1.7.1.1