| Message ID | 20240410134044.2138310-9-claudiu.beznea.uj@bp.renesas.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | watchdog: rzg2l_wdt: Add support for RZ/G3S | expand |
On Wed, Apr 10, 2024 at 04:40:42PM +0300, Claudiu wrote: > From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> > > The RZ/G3S supports deep sleep states where power to most of the IP blocks > is cut off. To ensure proper working of the watchdog when resuming from > such states, the suspend function is stopping the watchdog and the resume > function is starting it. There is no need to configure the watchdog > in case the watchdog was stopped prior to starting suspend. > > Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > > Changes in v8: > - none > > Changes in v7: > - none > > Changes in v6: > - none > > Changes in v5: > - none > > Changes in v4: > - none > > Changes in v3: > - none > > Changes in v2: > - remove the usage of pm_ptr() > > > drivers/watchdog/rzg2l_wdt.c | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c > index 42f1d5d6f07e..c8c20cfb97a3 100644 > --- a/drivers/watchdog/rzg2l_wdt.c > +++ b/drivers/watchdog/rzg2l_wdt.c > @@ -284,6 +284,7 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) > priv->wdev.timeout = WDT_DEFAULT_TIMEOUT; > > watchdog_set_drvdata(&priv->wdev, priv); > + dev_set_drvdata(dev, priv); > ret = devm_add_action_or_reset(&pdev->dev, rzg2l_wdt_pm_disable, &priv->wdev); > if (ret) > return ret; > @@ -305,10 +306,35 @@ static const struct of_device_id rzg2l_wdt_ids[] = { > }; > MODULE_DEVICE_TABLE(of, rzg2l_wdt_ids); > > +static int rzg2l_wdt_suspend_late(struct device *dev) > +{ > + struct rzg2l_wdt_priv *priv = dev_get_drvdata(dev); > + > + if (!watchdog_active(&priv->wdev)) > + return 0; > + > + return rzg2l_wdt_stop(&priv->wdev); > +} > + > +static int rzg2l_wdt_resume_early(struct device *dev) > +{ > + struct rzg2l_wdt_priv *priv = dev_get_drvdata(dev); > + > + if (!watchdog_active(&priv->wdev)) > + return 0; > + > + return rzg2l_wdt_start(&priv->wdev); > +} > + > +static const struct dev_pm_ops rzg2l_wdt_pm_ops = { > + LATE_SYSTEM_SLEEP_PM_OPS(rzg2l_wdt_suspend_late, rzg2l_wdt_resume_early) > +}; > + > static struct platform_driver rzg2l_wdt_driver = { > .driver = { > .name = "rzg2l_wdt", > .of_match_table = rzg2l_wdt_ids, > + .pm = &rzg2l_wdt_pm_ops, > }, > .probe = rzg2l_wdt_probe, > }; > -- > 2.39.2 >
diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index 42f1d5d6f07e..c8c20cfb97a3 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -284,6 +284,7 @@ static int rzg2l_wdt_probe(struct platform_device *pdev) priv->wdev.timeout = WDT_DEFAULT_TIMEOUT; watchdog_set_drvdata(&priv->wdev, priv); + dev_set_drvdata(dev, priv); ret = devm_add_action_or_reset(&pdev->dev, rzg2l_wdt_pm_disable, &priv->wdev); if (ret) return ret; @@ -305,10 +306,35 @@ static const struct of_device_id rzg2l_wdt_ids[] = { }; MODULE_DEVICE_TABLE(of, rzg2l_wdt_ids); +static int rzg2l_wdt_suspend_late(struct device *dev) +{ + struct rzg2l_wdt_priv *priv = dev_get_drvdata(dev); + + if (!watchdog_active(&priv->wdev)) + return 0; + + return rzg2l_wdt_stop(&priv->wdev); +} + +static int rzg2l_wdt_resume_early(struct device *dev) +{ + struct rzg2l_wdt_priv *priv = dev_get_drvdata(dev); + + if (!watchdog_active(&priv->wdev)) + return 0; + + return rzg2l_wdt_start(&priv->wdev); +} + +static const struct dev_pm_ops rzg2l_wdt_pm_ops = { + LATE_SYSTEM_SLEEP_PM_OPS(rzg2l_wdt_suspend_late, rzg2l_wdt_resume_early) +}; + static struct platform_driver rzg2l_wdt_driver = { .driver = { .name = "rzg2l_wdt", .of_match_table = rzg2l_wdt_ids, + .pm = &rzg2l_wdt_pm_ops, }, .probe = rzg2l_wdt_probe, };