[PATCH v2 1/2] watchdog: add wdt suspend/resume support

[Guenter Roeck]

On 07/22/2015 10:49 PM, Eddie Huang wrote:
> From: Greta Zhang <greta.zhang at mediatek.com>
>
> add wdt driver suspend/resume support
>
> Signed-off-by: Greta Zhang <greta.zhang at mediatek.com>
> Signed-off-by: Roger Lu <roger.lu at mediatek.com>
> Signed-off-by: Eddie Huang <eddie.huang at mediatek.com>


Subject line should identify the driver, ie mtk_wdt.
"wdt" doesn't really help.

Other than that,

Reviewed-by: Guenter Roeck <linux at roeck-us.net>

Guenter

> ---
>   drivers/watchdog/mtk_wdt.c | 30 ++++++++++++++++++++++++++++++
>   1 file changed, 30 insertions(+)
>
> diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
> index 938b987..056412c 100644
> --- a/drivers/watchdog/mtk_wdt.c
> +++ b/drivers/watchdog/mtk_wdt.c
> @@ -221,17 +221,47 @@ static int mtk_wdt_remove(struct platform_device *pdev)
>   	return 0;
>   }
>
> +#ifdef CONFIG_PM_SLEEP
> +static int mtk_wdt_suspend(struct device *dev)
> +{
> +	struct mtk_wdt_dev *mtk_wdt = dev_get_drvdata(dev);
> +
> +	if (watchdog_active(&mtk_wdt->wdt_dev))
> +		mtk_wdt_stop(&mtk_wdt->wdt_dev);
> +
> +	return 0;
> +}
> +
> +static int mtk_wdt_resume(struct device *dev)
> +{
> +	struct mtk_wdt_dev *mtk_wdt = dev_get_drvdata(dev);
> +
> +	if (watchdog_active(&mtk_wdt->wdt_dev)) {
> +		mtk_wdt_start(&mtk_wdt->wdt_dev);
> +		mtk_wdt_ping(&mtk_wdt->wdt_dev);
> +	}
> +
> +	return 0;
> +}
> +#endif
> +
>   static const struct of_device_id mtk_wdt_dt_ids[] = {
>   	{ .compatible = "mediatek,mt6589-wdt" },
>   	{ /* sentinel */ }
>   };
>   MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);
>
> +static const struct dev_pm_ops mtk_wdt_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(mtk_wdt_suspend,
> +				mtk_wdt_resume)
> +};
> +
>   static struct platform_driver mtk_wdt_driver = {
>   	.probe		= mtk_wdt_probe,
>   	.remove		= mtk_wdt_remove,
>   	.driver		= {
>   		.name		= DRV_NAME,
> +		.pm		= &mtk_wdt_pm_ops,
>   		.of_match_table	= mtk_wdt_dt_ids,
>   	},
>   };
>