watchdog: s3c2410: Add support for device tree based probe

This patch adds the of_match_table to enable s3c2410-wdt driver
to be probed when watchdog device node is found in the device tree.
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

Documentation/devicetree/bindings/watchdog/samsung-wdt.txt

+* Samsung's Watchdog Timer Controller
+
+The Samsung's Watchdog controller is used for resuming system operation
+after a preset amount of time during which the WDT reset event has not
+occured.
+
+Required properties:
+- compatible : should be "samsung,s3c2410-wdt"
+- reg : base physical address of the controller and length of memory mapped
+	region.
+- interrupts : interrupt number to the cpu.

drivers/watchdog/s3c2410_wdt.c

@@ -589,6 +589,15 @@ static int s3c2410wdt_resume(struct platform_device *dev)
 #define s3c2410wdt_resume  NULL
 #endif /* CONFIG_PM */
 
+#ifdef CONFIG_OF
+static const struct of_device_id s3c2410_wdt_match[] = {
+	{ .compatible = "samsung,s3c2410-wdt" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
+#else
+#define s3c2410_wdt_match NULL
+#endif
 
 static struct platform_driver s3c2410wdt_driver = {
 	.probe		= s3c2410wdt_probe,
@@ -599,6 +608,7 @@ static struct platform_driver s3c2410wdt_driver = {
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= "s3c2410-wdt",
+		.of_match_table	= s3c2410_wdt_match,
 	},
 };