drivers: watchdog: support setup watchdog timeout when close enable watchdog

Changelog: 看门狗驱动支持在关机调用看门狗时设置超时时间
Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>

drivers/watchdog/Kconfig

@@ -47,6 +47,15 @@ config WATCHDOG_NOWAYOUT
 	  get killed. If you say Y here, the watchdog cannot be stopped once
 	  it has been started.
 
+config WATCHDOG_TIMEOUT_ON_CLOSE
+	int "Timeout value for opening watchdog device"
+	default 5
+	depends on !WATCHDOG_NOWAYOUT
+	help
+	  if not WATCHDOG_NOWAYOUT, mean setup watchdog daemon when poweroff
+	  so this option is second about watchdog timeout.
+	  if setup <= 0 mean not setup watchdog timeout. but ping watchdog also will exec
+
 config WATCHDOG_HANDLE_BOOT_ENABLED
 	bool "Update boot-enabled watchdog until userspace takes over"
 	default y

drivers/watchdog/watchdog_dev.c

@@ -966,6 +966,10 @@ static int watchdog_release(struct inode *inode, struct file *file)
 	/* If the watchdog was not stopped, send a keepalive ping */
 	if (err < 0) {
 		pr_crit("watchdog%d: watchdog did not stop!\n", wdd->id);
+#ifdef CONFIG_WATCHDOG_TIMEOUT_ON_CLOSE
+		if (wdd->ops->set_timeout && CONFIG_WATCHDOG_TIMEOUT_ON_CLOSE > 0)
+			wdd->ops->set_timeout(wdd, CONFIG_WATCHDOG_TIMEOUT_ON_CLOSE);
+#endif
 		watchdog_ping(wdd);
 	}