regulator: core: Add support for active-discharge configuration

Add support to enable/disable active discharge of regulator via
machine constraints. This configuration is done when setting
machine constraint during regulator register and if regulator
driver implemented the callback ops.

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

2 files changed, 17 insertions, 0 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 744c9889f88d..7ebb7c899158 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1140,6 +1140,17 @@ static int set_machine_constraints(struct regulator_dev *rdev,
                 }
         }
 
+        if (rdev->constraints->active_discharge && ops->set_active_discharge) {
+                bool ad_state = (rdev->constraints->active_discharge ==
+                              REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
+
+                ret = ops->set_active_discharge(rdev, ad_state);
+                if (ret < 0) {
+                        rdev_err(rdev, "failed to set active discharge\n");
+                        return ret;
+                }
+        }
+
         print_constraints(rdev);
         return 0;
 out:
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 499e437c7e91..fe2e33441dae 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -93,6 +93,12 @@ static void of_get_regulation_constraints(struct device_node *np,
 
         constraints->soft_start = of_property_read_bool(np,
                                         "regulator-soft-start");
+        ret = of_property_read_u32(np, "regulator-active-discharge", &pval);
+        if (!ret) {
+                constraints->active_discharge =
+                                (pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE :
+                                        REGULATOR_ACTIVE_DISCHARGE_DISABLE;
+        }
 
         if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
                 if (desc && desc->of_map_mode) {