Re: [PATCH 2/3] i2c/at91: add support for system PM

Ludovic Desroches
2014-10-20T12:42:42Z

On Mon, Oct 20, 2014 at 11:42:13AM +0800, Wenyou Yang wrote:
> Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>

Acked by: Ludovic Desroches <ludovic.desroches@atmel.com>

> ---
> drivers/i2c/busses/i2c-at91.c | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
>
> diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
> index 03b9f48..8f408f8 100644
> --- a/drivers/i2c/busses/i2c-at91.c
> +++ b/drivers/i2c/busses/i2c-at91.c
> @@ -845,6 +845,35 @@ static int at91_twi_remove(struct platform_device *pdev)
> }
>
> #ifdef CONFIG_PM
> +#ifdef CONFIG_PM_SLEEP
> +static int at91_twi_suspend(struct device *dev)
> +{
> + struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
> +
> + if (!pm_runtime_suspended(dev))
> + clk_disable_unprepare(twi_dev->clk);
> +
> + return 0;
> +}
> +
> +static int at91_twi_resume(struct device *dev)
> +{
> + struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
> + int ret;
> +
> + if (!pm_runtime_suspended(dev)) {
> + ret = clk_prepare_enable(twi_dev->clk);
> + if (ret)
> + return ret;
> + }
> +
> + pm_runtime_mark_last_busy(dev);
> + pm_request_autosuspend(dev);
> +
> + return 0;
> +}
> +#endif
> +
> #ifdef CONFIG_PM_RUNTIME
> static int at91_twi_runtime_suspend(struct device *dev)
> {
> @@ -864,6 +893,7 @@ static int at91_twi_runtime_resume(struct device *dev)
> #endif
>
> static const struct dev_pm_ops at91_twi_pm = {
> + SET_SYSTEM_SLEEP_PM_OPS(at91_twi_suspend, at91_twi_resume)
> SET_RUNTIME_PM_OPS(at91_twi_runtime_suspend,
> at91_twi_runtime_resume, NULL)
> };
> --
> 1.7.9.5
>