On Thu, Feb 04, 2016 at 01:18:42AM +0800, fu.wei at linaro.org wrote:

+static int sbsa_gwdt_keepalive(struct watchdog_device *wdd)
+{
+	struct sbsa_gwdt *gwdt = to_sbsa_gwdt(wdd);
+
+	/*
+	* Writing WRR for an explicit watchdog refresh.
+	* You can write anyting(like 0xc0ffee).
+	*/
+	writel(0xc0ffee, gwdt->refresh_base + SBSA_GWDT_WRR);
+
+	return 0;
+}

You might get in trouble for that. 0xd09f00d is probably less poisonous.

http://www.petpoisonhelpline.com/poison/caffeine/

Will