regulator: max8973: add mechanism to enable/disable through GPIO

MAX8973 supports the voltage output enable/disable through its EN
pin. This EN pin can be connected through GPIO from host processor.
Add support to provide GPIO number from platform/DT and if it is
valid GPIO then enable external control default.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/regulator/max8973-regulator.h b/include/linux/regulator/max8973-regulator.h
index f8acc052e353..f6a8a16a0d4d 100644
--- a/include/linux/regulator/max8973-regulator.h
+++ b/include/linux/regulator/max8973-regulator.h
@@ -58,6 +58,9 @@
  *              control signal from EN input pin. If it is false then
  *              voltage output will be enabled/disabled through EN bit of
  *              device register.
+ * @enable_gpio: Enable GPIO. If EN pin is controlled through GPIO from host
+ *              then GPIO number can be provided. If no GPIO controlled then
+ *              it should be -1.
  * @dvs_gpio: GPIO for dvs. It should be -1 if this is tied with fixed logic.
  * @dvs_def_state: Default state of dvs. 1 if it is high else 0.
  */
@@ -65,6 +68,7 @@ struct max8973_regulator_platform_data {
         struct regulator_init_data *reg_init_data;
         unsigned long control_flags;
         bool enable_ext_control;
+        int enable_gpio;
         int dvs_gpio;
         unsigned dvs_def_state:1;
 };