regulator: of: add support for parsing regulator-state-standby

Set the according constraints for PM_SUSPEND_STANDBY case.
Previously, only suspend to mem/disk were taken into
consideration.
Signed-off-by: Andrei Stefanescu <andrei.stefanescu@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/of_regulator.c

@@ -20,6 +20,7 @@
 #include "internal.h"
 
 static const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
+	[PM_SUSPEND_STANDBY]	= "regulator-state-standby",
 	[PM_SUSPEND_MEM]	= "regulator-state-mem",
 	[PM_SUSPEND_MAX]	= "regulator-state-disk",
 };
@@ -181,9 +182,11 @@ static void of_get_regulation_constraints(struct device_node *np,
 		case PM_SUSPEND_MAX:
 			suspend_state = &constraints->state_disk;
 			break;
+		case PM_SUSPEND_STANDBY:
+			suspend_state = &constraints->state_standby;
+			break;
 		case PM_SUSPEND_ON:
 		case PM_SUSPEND_TO_IDLE:
-		case PM_SUSPEND_STANDBY:
 		default:
 			continue;
 		}