[RFC 1/5] regulator: core: Get voltage from parent if not available

From: Javier Martinez Canillas
Date: Tue Jul 29 2014 - 12:30:43 EST

Load switches are modeled as regulators but they just provide
the voltage of their parent input supply. So the drivers for
these switches usually don't provide a .get_voltage function
handler but there is code in the kernel that assumes that all
regulators should be able to provide its current voltage rail.

So, if the output voltage for a regulator is not available and
it has a parent supply, then pass the voltage of its parent.

Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
drivers/regulator/core.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 69c9c08..089cea8 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2695,6 +2695,8 @@ static int _regulator_get_voltage(struct regulator_dev *rdev)
ret = rdev->desc->ops->list_voltage(rdev, 0);
} else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
ret = rdev->desc->fixed_uV;
+ } else if (rdev->supply) {
+ ret = regulator_get_voltage(rdev->supply);
} else {
return -EINVAL;

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