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SubjectRE: [PATCH 3/3] watchdog: da9062: add power management ops
Date
On 08 January 2020 09:57, Marco Felsch wrote:

> Disable the watchdog during suspend if it is enabled and re-enable it on
> resume. So we can sleep without the interruptions.
>
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>

Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>

> ---
> v2:
> - add dlg,use-sw-pm check to differentiate between automatic and manual
> disabling/enabling.
> ---
> drivers/watchdog/da9062_wdt.c | 37
> +++++++++++++++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
>
> diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
> index e149e66a6ea9..c9b9d6394525 100644
> --- a/drivers/watchdog/da9062_wdt.c
> +++ b/drivers/watchdog/da9062_wdt.c
> @@ -15,6 +15,7 @@
> #include <linux/jiffies.h>
> #include <linux/mfd/da9062/registers.h>
> #include <linux/mfd/da9062/core.h>
> +#include <linux/property.h>
> #include <linux/regmap.h>
> #include <linux/of.h>
>
> @@ -30,6 +31,7 @@ static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32,
> 65, 131 };
> struct da9062_watchdog {
> struct da9062 *hw;
> struct watchdog_device wdtdev;
> + bool use_sw_pm;
> };
>
> static unsigned int da9062_wdt_timeout_to_sel(unsigned int secs)
> @@ -198,6 +200,8 @@ static int da9062_wdt_probe(struct platform_device
> *pdev)
> if (!wdt)
> return -ENOMEM;
>
> + wdt->use_sw_pm = device_property_present(dev, "dlg,use-sw-pm");
> +
> wdt->hw = chip;
>
> wdt->wdtdev.info = &da9062_watchdog_info;
> @@ -212,6 +216,7 @@ static int da9062_wdt_probe(struct platform_device
> *pdev)
> watchdog_set_restart_priority(&wdt->wdtdev, 128);
>
> watchdog_set_drvdata(&wdt->wdtdev, wdt);
> + dev_set_drvdata(dev, &wdt->wdtdev);
>
> ret = devm_watchdog_register_device(dev, &wdt->wdtdev);
> if (ret < 0)
> @@ -220,10 +225,42 @@ static int da9062_wdt_probe(struct platform_device
> *pdev)
> return da9062_wdt_ping(&wdt->wdtdev);
> }
>
> +static int __maybe_unused da9062_wdt_suspend(struct device *dev)
> +{
> + struct watchdog_device *wdd = dev_get_drvdata(dev);
> + struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd);
> +
> + if (!wdt->use_sw_pm)
> + return 0;
> +
> + if (watchdog_active(wdd))
> + return da9062_wdt_stop(wdd);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused da9062_wdt_resume(struct device *dev)
> +{
> + struct watchdog_device *wdd = dev_get_drvdata(dev);
> + struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd);
> +
> + if (!wdt->use_sw_pm)
> + return 0;
> +
> + if (watchdog_active(wdd))
> + return da9062_wdt_start(wdd);
> +
> + return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(da9062_wdt_pm_ops,
> + da9062_wdt_suspend, da9062_wdt_resume);
> +
> static struct platform_driver da9062_wdt_driver = {
> .probe = da9062_wdt_probe,
> .driver = {
> .name = "da9062-watchdog",
> + .pm = &da9062_wdt_pm_ops,
> .of_match_table = da9062_compatible_id_table,
> },
> };
> --
> 2.20.1

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