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watchdog: renesas_wdt: Add suspend/resume support 

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 <fabrizio.castro@bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Fabrizio Castro 2018-03-05 15:30:24 +00:00 committed by Wim Van Sebroeck
parent 755ae84278
commit 07278ca1cc
1 changed files with 26 additions and 0 deletions
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26
drivers/watchdog/renesas_wdt.c
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@ -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,