regulator: fixed: dt: support for input supply

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>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 22 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/regulator/fixed-regulator.txt b/Documentation/devicetree/bindings/regulator/fixed-regulator.txt
index 2f5b6b1ba15f..4fae41d54798 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 1a0b17e8d8a9..185468c4d38f 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -102,6 +102,9 @@ 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))
+                config->input_supply = "vin";
+
         return config;
 }
 
@@ -169,6 +172,17 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
 
         drvdata->desc.enable_time = config->startup_delay;
 
+        if (config->input_supply) {
+                drvdata->desc.supply_name = kstrdup(config->input_supply,
+                                                        GFP_KERNEL);
+                if (!drvdata->desc.supply_name) {
+                        dev_err(&pdev->dev,
+                                "Failed to allocate input supply\n");
+                        ret = -ENOMEM;
+                        goto err_name;
+                }
+        }
+
         if (config->microvolts)
                 drvdata->desc.n_voltages = 1;
 
@@ -202,7 +216,7 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
         if (IS_ERR(drvdata->dev)) {
                 ret = PTR_ERR(drvdata->dev);
                 dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
-                goto err_name;
+                goto err_input;
         }
 
         platform_set_drvdata(pdev, drvdata);
@@ -212,6 +226,8 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
 
         return 0;
 
+err_input:
+        kfree(drvdata->desc.supply_name);
 err_name:
         kfree(drvdata->desc.name);
 err:
@@ -223,6 +239,7 @@ static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev)
         struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev);
 
         regulator_unregister(drvdata->dev);
+        kfree(drvdata->desc.supply_name);
         kfree(drvdata->desc.name);
 
         return 0;
diff --git a/include/linux/regulator/fixed.h b/include/linux/regulator/fixed.h
index f83f7440b488..d6c24c53adf4 100644
--- a/include/linux/regulator/fixed.h
+++ b/include/linux/regulator/fixed.h
@@ -22,6 +22,7 @@ struct regulator_init_data;
 /**
  * struct fixed_voltage_config - fixed_voltage_config structure
  * @supply_name:        Name of the regulator supply
+ * @input_supply:       Name of the input regulator supply
  * @microvolts:         Output voltage of regulator
  * @gpio:               GPIO to use for enable control
  *                      set to -EINVAL if not used
@@ -46,6 +47,7 @@ struct regulator_init_data;
  */
 struct fixed_voltage_config {
         const char *supply_name;
+        const char *input_supply;
         int microvolts;
         int gpio;
         unsigned startup_delay;