[PATCH v5 13/26] watchdog: renesas_wdt: Add restart handler
From: Fabrizio Castro <hidden>
Date: 2018-02-12 17:44:22
Also in:
linux-arm-kernel, linux-clk, linux-renesas-soc, linux-watchdog
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
On iWave's boards iwg20d and iwg22d the only way to reboot the system is by means of the watchdog. This patch adds a restart handler to rwdt_ops, and also makes sure we keep its priority to a medium level, in order to not override other more effective handlers. Signed-off-by: Fabrizio Castro <fabrizio.castro-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram-kTT6dE0pTRh9uiUsa/gSgQ@public.gmane.org> Reviewed-by: Guenter Roeck <redacted> --- v4->v5: * changed rwdt_restart implementation as per Wolfram comments drivers/watchdog/renesas_wdt.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index e972b7b..0f88614 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c@@ -107,6 +107,16 @@ static unsigned int rwdt_get_timeleft(struct watchdog_device *wdev) return DIV_BY_CLKS_PER_SEC(priv, 65536 - val); } +static int rwdt_restart(struct watchdog_device *wdev, unsigned long action, + void *data) +{ + struct rwdt_priv *priv = watchdog_get_drvdata(wdev); + + rwdt_start(wdev); + rwdt_write(priv, 0xffff, RWTCNT); + return 0; +} + static const struct watchdog_info rwdt_ident = { .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT, .identity = "Renesas WDT Watchdog",
@@ -118,6 +128,7 @@ static const struct watchdog_ops rwdt_ops = { .stop = rwdt_stop, .ping = rwdt_init_timeout, .get_timeleft = rwdt_get_timeleft, + .restart = rwdt_restart, }; static int rwdt_probe(struct platform_device *pdev)
@@ -176,6 +187,7 @@ static int rwdt_probe(struct platform_device *pdev) platform_set_drvdata(pdev, priv); watchdog_set_drvdata(&priv->wdev, priv); watchdog_set_nowayout(&priv->wdev, nowayout); + watchdog_set_restart_priority(&priv->wdev, 0); /* This overrides the default timeout only if DT configuration was found */ ret = watchdog_init_timeout(&priv->wdev, 0, &pdev->dev);
--
2.7.4
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