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>
diff --git a/include/linux/regulator/fixed.h b/include/linux/regulator/fixed.h
index f83f744..d6c24c53 100644
--- a/include/linux/regulator/fixed.h
+++ b/include/linux/regulator/fixed.h
@@ -22,6 +22,7 @@
 /**
  * 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 fixed_voltage_config {
 	const char *supply_name;
+	const char *input_supply;
 	int microvolts;
 	int gpio;
 	unsigned startup_delay;