regulator: Enable supply regulator if child rail is enabled.

During regulator_register, the rail is set on the provided
machine constraints and if it is enabled then it is also
require to enable the supply regulator. This will make sure
that:
   1. Proper reference count for supply regulator to be maintain.
   2. Supply regulator should be enable when given rail is enabled.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e70e15c4aa28..eb750a1ed7fe 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2802,6 +2802,14 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
                 ret = set_supply(rdev, r);
                 if (ret < 0)
                         goto scrub;
+
+                /* Enable supply if rail is enabled */
+                if (rdev->desc->ops->is_enabled &&
+                                rdev->desc->ops->is_enabled(rdev)) {
+                        ret = regulator_enable(rdev->supply);
+                        if (ret < 0)
+                                goto scrub;
+                }
         }
 
         /* add consumers devices */