drivers/rtc/rtc-tegra.c: convert to DT driver

After Kernel 3.7, the Tegra device will only support booting with DT.
The legacy Tegra RTC platform driver will not work anymore.  This patch
converts the driver to support DT.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-tegra.c

@@ -303,6 +303,12 @@ static struct rtc_class_ops tegra_rtc_ops = {
 	.alarm_irq_enable = tegra_rtc_alarm_irq_enable,
 };
 
+static const struct of_device_id tegra_rtc_dt_match[] = {
+	{ .compatible = "nvidia,tegra20-rtc", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, tegra_rtc_dt_match);
+
 static int tegra_rtc_probe(struct platform_device *pdev)
 {
 	struct tegra_rtc_info *info;
@@ -440,6 +446,7 @@ static struct platform_driver tegra_rtc_driver = {
 	.driver		= {
 		.name	= "tegra_rtc",
 		.owner	= THIS_MODULE,
+		.of_match_table = tegra_rtc_dt_match,
 	},
 #ifdef CONFIG_PM
 	.suspend	= tegra_rtc_suspend,