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>
{
struct regulator_dev *rdev = regulator->rdev;
{
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);
}
EXPORT_SYMBOL_GPL(regulator_count_voltages);
if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
return rdev->desc->fixed_uV;
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 {
-
- mutex_lock(&rdev->mutex);
- ret = ops->list_voltage(rdev, selector);
- mutex_unlock(&rdev->mutex);
if (ret > 0) {
if (ret < rdev->constraints->min_uV)
if (ret > 0) {
if (ret < rdev->constraints->min_uV)