regulator: core: Get voltage from parent if not available

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@collabora.co.uk>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b4902ab64abe99ba48e893f609a86b8b27295d46..57fe446fabce85601d458a65761783232c7cfbb0 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2620,6 +2620,8 @@ 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;
        }