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regulator: core: Allow to get voltage count and list from parent 

Load switches are modeled as regulators but they just provide
the voltage of their parent input supply. So, the drivers for
these switches usually neither provide a .list_voltage handler
not set a .n_voltages count. But there is code in the kernel
that assumes that all regulators should be able to provide this
information (e.g: cpufreq and mmc subsystems).

If the voltage count and list are not available for a regulator
and it has a parent input supply, then use the parent values.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Javier Martinez Canillas 2014-07-29 18:28:56 +02:00 committed by Mark Brown
parent e303996e94
commit 26988efe11
1 changed files with 17 additions and 6 deletions
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23
drivers/regulator/core.c
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@ -2182,7 +2182,13 @@ int regulator_count_voltages(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
return rdev->desc->n_voltages ? : -EINVAL;
if (rdev->desc->n_voltages)
return rdev->desc->n_voltages;
if (!rdev->supply)
return -EINVAL;
return regulator_count_voltages(rdev->supply);
}
EXPORT_SYMBOL_GPL(regulator_count_voltages);
@ -2205,12 +2211,17 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector)
if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
return rdev->desc->fixed_uV;
if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
if (ops->list_voltage) {
if (selector >= rdev->desc->n_voltages)
return -EINVAL;
mutex_lock(&rdev->mutex);
ret = ops->list_voltage(rdev, selector);
mutex_unlock(&rdev->mutex);
} else if (rdev->supply) {
ret = regulator_list_voltage(rdev->supply, selector);
} else {
return -EINVAL;
mutex_lock(&rdev->mutex);
ret = ops->list_voltage(rdev, selector);
mutex_unlock(&rdev->mutex);
}
if (ret > 0) {
if (ret < rdev->constraints->min_uV)