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| author | Fabrizio Castro <fabrizio.castro@bp.renesas.com> | 2018-03-05 18:30:24 +0300 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2018-03-10 13:45:34 +0300 |
| commit | 07278ca1ccc9a1241f14a8aaa4f2430b7b217c3f (patch) | |
| tree | 597b834ef88a1572e1747f1642a0a035dced6a0b /drivers/watchdog/renesas_wdt.c | |
| parent | 755ae842782037b35742e759aa0601b3c5834111 (diff) | |
| download | linux-07278ca1ccc9a1241f14a8aaa4f2430b7b217c3f.tar.xz | |
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>
Diffstat (limited to 'drivers/watchdog/renesas_wdt.c')
| -rw-r--r-- | drivers/watchdog/renesas_wdt.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c index 831ef83f6de1..024d54eda11e 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, |