watchdog: omap_wdt: early_enable module parameter

Add a early_enable module parameter to the omap_wdt that starts the
watchdog on module insertion. The default value is 0 which does not
start the watchdog - which also does not change the behavior if the
parameter is not given.
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

Documentation/watchdog/watchdog-parameters.txt

@@ -208,6 +208,7 @@ nowayout: Watchdog cannot be stopped once started
 -------------------------------------------------
 omap_wdt:
 timer_margin: initial watchdog timeout (in seconds)
+early_enable: Watchdog is started on module insertion (default=0
 nowayout: Watchdog cannot be stopped once started
 	(default=kernel config parameter)
 -------------------------------------------------

drivers/watchdog/omap_wdt.c

@@ -55,6 +55,11 @@ MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
 
 #define to_omap_wdt_dev(_wdog)	container_of(_wdog, struct omap_wdt_dev, wdog)
 
+static bool early_enable;
+module_param(early_enable, bool, 0);
+MODULE_PARM_DESC(early_enable,
+	"Watchdog is started on module insertion (default=0)");
+
 struct omap_wdt_dev {
 	struct watchdog_device wdog;
 	void __iomem    *base;          /* physical */
@@ -279,6 +284,9 @@ static int omap_wdt_probe(struct platform_device *pdev)
 
 	pm_runtime_put_sync(wdev->dev);
 
+	if (early_enable)
+		omap_wdt_start(&wdev->wdog);
+
 	return 0;
 }