From 0aad7c4438b2e87359cd7b42c3e11b17f477ab8f Mon Sep 17 00:00:00 2001 From: Claudiu Beznea Date: Fri, 31 May 2024 09:57:22 +0300 Subject: [PATCH] watchdog: rzg2l_wdt: Add suspend/resume support 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 Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20240531065723.1085423-9-claudiu.beznea.uj@bp.renesas.com Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- 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 d77290f7fdea..2a35f890a288 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -286,6 +286,7 @@ 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; @@ -307,10 +308,35 @@ 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, };