El Fri, Feb 10, 2017 at 12:43:48PM -0800 Matthias Kaehlcke ha dit:
> The output voltage of a voltage controlled regulator can be controlled
> through the voltage of another regulator. The current version of this
> driver assumes that the output voltage is a linear function of the control
> voltage.
>
> ...
>
> +static int vctrl_probe(struct platform_device *pdev)
> +{
> ...
> + /* determine if the voltage range of the control supply is continuous */
> + if ((regulator_count_voltages(vctrl->ctrl_supply) == 1) &&
> + regulator_is_supported_voltage(vctrl->ctrl_supply,
> + vrange_ctrl->min_uV,
> + vrange_ctrl->min_uV) &&
> + regulator_is_supported_voltage(vctrl->ctrl_supply,
> + vrange_ctrl->max_uV,
> + vrange_ctrl->max_uV)) {
> + rdesc->continuous_voltage_range = true;
> + rdesc->ops = &vctrl_ops_cont;
> + } else {
> + rdesc->ops = &vctrl_ops_non_cont;
> + }
This creature of indisputable beauty seemed to do the job on my
test systen, however I just realized that the condition is BS. It
turns out that on my system the voltage count of 1 stems from the
parent, since the voltage count of the control supply itself is zero.
int regulator_count_voltages(struct regulator *regulator)
{
struct regulator_dev *rdev = regulator->rdev;
if (rdev->desc->n_voltages)
return rdev->desc->n_voltages;
if (!rdev->supply)
return -EINVAL;
return regulator_count_voltages(rdev->supply);
}
This certainly doesn't help to determine if the regulator has a
continous voltage range. It seems we need a function that evaluates
rdesc->continuous_voltage_range
--
Matthias
