On 07/04/17 10:34, Laxman Dewangan wrote:
> In some of NVIDIA Tegra's platform, PWM controller is used to
> control the PWM controlled regulators. PWM signal is connected to
> the VID pin of the regulator where duty cycle of PWM signal decide
> the voltage level of the regulator output.
>
> When system enters suspend, some PWM client/slave regulator devices
> require the PWM output to be tristated.
>
> Add support to configure the pin state via pinctrl frameworks in
> suspend and active state of the system.
>
> Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx>
>
> ---
> Changes from v1:
> - Use standard pinctrl names for sleep and active state.
> - Use API pinctrl_pm_select_*()
>
> Changes from V2:
> - Use returns of pinctrl_pm_select_*()
> - Rephrase commit message.
> ---
> drivers/pwm/pwm-tegra.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
> index 21518be..9c7f180 100644
> --- a/drivers/pwm/pwm-tegra.c
> +++ b/drivers/pwm/pwm-tegra.c
> @@ -29,6 +29,7 @@
> #include <linux/of_device.h>
> #include <linux/pwm.h>
> #include <linux/platform_device.h>
> +#include <linux/pinctrl/consumer.h>
> #include <linux/slab.h>
> #include <linux/reset.h>
>
> @@ -255,6 +256,18 @@ static int tegra_pwm_remove(struct platform_device *pdev)
> return pwmchip_remove(&pc->chip);
> }
>
> +#ifdef CONFIG_PM_SLEEP
> +static int tegra_pwm_suspend(struct device *dev)
> +{
> + return pinctrl_pm_select_sleep_state(dev);
> +}
> +
> +static int tegra_pwm_resume(struct device *dev)
> +{
> + return pinctrl_pm_select_default_state(dev);
> +}
> +#endif
> +
> static const struct tegra_pwm_soc tegra20_pwm_soc = {
> .num_channels = 4,
> };
> @@ -271,10 +284,15 @@ static const struct of_device_id tegra_pwm_of_match[] = {
>
> MODULE_DEVICE_TABLE(of, tegra_pwm_of_match);
>
> +static const struct dev_pm_ops tegra_pwm_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(tegra_pwm_suspend, tegra_pwm_resume)
> +};
> +
> static struct platform_driver tegra_pwm_driver = {
> .driver = {
> .name = "tegra-pwm",
> .of_match_table = tegra_pwm_of_match,
> + .pm = &tegra_pwm_pm_ops,
> },
> .probe = tegra_pwm_probe,
> .remove = tegra_pwm_remove,
Acked-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Cheers
Jon
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