[PATCH v1 1/2] watchdog: dw_wdt: add stop watchdog operation
From: o.rempel@pengutronix.de (Oleksij Rempel)
Date: 2017-09-14 08:15:22
Also in:
linux-devicetree, linux-watchdog, lkml
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
From: Steffen Trumtrar <redacted> The only way of stopping the watchdog is by resetting it. Add the watchdog op for stopping the device and reset if a reset line is provided. Signed-off-by: Steffen Trumtrar <redacted> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Cc: Wim Van Sebroeck <redacted> Cc: Guenter Roeck <linux@roeck-us.net> Cc: linux-watchdog at vger.kernel.org --- drivers/watchdog/dw_wdt.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 36be987ff9ef..50d8a6a5b5ac 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c@@ -135,6 +135,21 @@ static int dw_wdt_start(struct watchdog_device *wdd) return 0; } +static int dw_wdt_stop(struct watchdog_device *wdd) +{ + struct dw_wdt *dw_wdt = to_dw_wdt(wdd); + + if (IS_ERR(dw_wdt->rst)) { + dev_warn(wdd->parent, "No reset line. Will not stop.\n"); + return PTR_ERR(dw_wdt->rst); + } + + reset_control_assert(dw_wdt->rst); + reset_control_deassert(dw_wdt->rst); + + return 0; +} + static int dw_wdt_restart(struct watchdog_device *wdd, unsigned long action, void *data) {
@@ -173,6 +188,7 @@ static const struct watchdog_info dw_wdt_ident = { static const struct watchdog_ops dw_wdt_ops = { .owner = THIS_MODULE, .start = dw_wdt_start, + .stop = dw_wdt_stop, .ping = dw_wdt_ping, .set_timeout = dw_wdt_set_timeout, .get_timeleft = dw_wdt_get_timeleft,
--
2.11.0