On R-Car Gen2 and RZ/G1 the watchdog IP clock needs to be always ON, on R-Car Gen3 we power the IP down during suspend.
This commit adds suspend/resume support, so that the watchdog counting "pauses" during suspend on all of the SoCs compatible with this driver and on those we are now adding support for (R-Car Gen2 and RZ/G1). Signed-off-by: Fabrizio Castro <[email protected]> Signed-off-by: Ramesh Shanmugasundaram <[email protected]> --- v6->v7: * backup and restore register RWTCNT instead of using rwdt_get_timeleft and rwdt_set_timeleft drivers/watchdog/renesas_wdt.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c index 831ef83..024d54e 100644 --- a/drivers/watchdog/renesas_wdt.c +++ b/drivers/watchdog/renesas_wdt.c @@ -49,6 +49,7 @@ struct rwdt_priv { void __iomem *base; struct watchdog_device wdev; unsigned long clk_rate; + u16 time_left; u8 cks; }; @@ -203,6 +204,30 @@ static int rwdt_remove(struct platform_device *pdev) return 0; } +static int __maybe_unused rwdt_suspend(struct device *dev) +{ + struct rwdt_priv *priv = dev_get_drvdata(dev); + + if (watchdog_active(&priv->wdev)) { + priv->time_left = readw(priv->base + RWTCNT); + rwdt_stop(&priv->wdev); + } + return 0; +} + +static int __maybe_unused rwdt_resume(struct device *dev) +{ + struct rwdt_priv *priv = dev_get_drvdata(dev); + + if (watchdog_active(&priv->wdev)) { + rwdt_start(&priv->wdev); + rwdt_write(priv, priv->time_left, RWTCNT); + } + return 0; +} + +static SIMPLE_DEV_PM_OPS(rwdt_pm_ops, rwdt_suspend, rwdt_resume); + /* * This driver does also fit for R-Car Gen2 (r8a779[0-4]) WDT. However, for SMP * to work there, one also needs a RESET (RST) driver which does not exist yet @@ -218,6 +243,7 @@ static struct platform_driver rwdt_driver = { .driver = { .name = "renesas_wdt", .of_match_table = rwdt_ids, + .pm = &rwdt_pm_ops, }, .probe = rwdt_probe, .remove = rwdt_remove, -- 2.7.4
