[PATCH v2, 1/2] driver: watchdog: reset watchdog in designware_wdt_stop() function

[Meng.Li at windriver.com]

From: MengLi <meng.li at windriver.com>

In uboot command line environment, watchdog is not able to be
stopped with below commands:
SOCFPGA_STRATIX10 # wdt dev watchdog at ffd00200
SOCFPGA_STRATIX10 # wdt stop
Refer to watchdog driver in linux kernel, it is also need to reset
watchdog after disable it so that the disable action takes effect.

v2:
Change "#if CONFIG_IS_ENABLED(DM_RESET)" into
"if (CONFIG_IS_ENABLED(DM_RESET)) {", and define the variable
into if condition sentence.

Signed-off-by: Meng Li <Meng.Li at windriver.com>
---
 drivers/watchdog/designware_wdt.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/watchdog/designware_wdt.c b/drivers/watchdog/designware_wdt.c
index 12f09a7a39..57cad1effc 100644
--- a/drivers/watchdog/designware_wdt.c
+++ b/drivers/watchdog/designware_wdt.c
@@ -96,6 +96,23 @@ static int designware_wdt_stop(struct udevice *dev)
 	designware_wdt_reset(dev);
 	writel(0, priv->base + DW_WDT_CR);
 
+        if (CONFIG_IS_ENABLED(DM_RESET)) {
+		struct reset_ctl_bulk resets;
+		int ret;
+
+		ret = reset_get_bulk(dev, &resets);
+		if (ret)
+			return ret;
+
+		ret = reset_assert_bulk(&resets);
+		if (ret)
+			return ret;
+
+		ret = reset_deassert_bulk(&resets);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 
-- 
2.17.1