aspeed: watchdog: Set bootstatus during probe

Check the aspeed timeout status register to see if the system has booted
from the secondary boot source. If so, set the watchdog device
bootstatus flag for "Card previously reset the CPU."

Signed-off-by: Eddie James <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/aspeed_wdt.c

···
 #define   WDT_CTRL_WDT_INTR		BIT(2)
 #define   WDT_CTRL_RESET_SYSTEM		BIT(1)
 #define   WDT_CTRL_ENABLE		BIT(0)
+#define WDT_TIMEOUT_STATUS	0x10
+#define   WDT_TIMEOUT_STATUS_BOOT_SECONDARY	BIT(1)
 
 /*
  * WDT_RESET_WIDTH controls the characteristics of the external pulse (if
···
 	struct device_node *np;
 	const char *reset_type;
 	u32 duration;
+	u32 status;
 	int ret;
 
 	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
···
 		 */
 		writel(duration - 1, wdt->base + WDT_RESET_WIDTH);
 	}
+
+	status = readl(wdt->base + WDT_TIMEOUT_STATUS);
+	if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY)
+		wdt->wdd.bootstatus = WDIOF_CARDRESET;
 
 	ret = devm_watchdog_register_device(&pdev->dev, &wdt->wdd);
 	if (ret) {