regulator: core: Try using the parent device for the default regmap

If the device doesn't have a regmap specified by the driver and we can't
find one on the device itself try its parent, providing a useful defualt
for many MFDs.

[Rewrite commit message -- broonie]

Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index ed376d9f525d..03fad8153476 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3202,8 +3202,10 @@ regulator_register(const struct regulator_desc *regulator_desc,
         rdev->desc = regulator_desc;
         if (config->regmap)
                 rdev->regmap = config->regmap;
-        else
+        else if (dev_get_regmap(dev, NULL))
                 rdev->regmap = dev_get_regmap(dev, NULL);
+        else if (dev->parent)
+                rdev->regmap = dev_get_regmap(dev->parent, NULL);
         INIT_LIST_HEAD(&rdev->consumer_list);
         INIT_LIST_HEAD(&rdev->list);
         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);