pinctrl: u300 device tree support

This adds a simple device tree compat string for the U300 pin
controller. The base address is already passed properly as
a resource and everything works fine.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-u300.c

@@ -1105,10 +1105,17 @@ static int u300_pmx_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id u300_pinctrl_match[] = {
+	{ .compatible = "stericsson,pinctrl-u300" },
+	{},
+};
+
+
 static struct platform_driver u300_pmx_driver = {
 	.driver = {
 		.name = DRIVER_NAME,
 		.owner = THIS_MODULE,
+		.of_match_table = u300_pinctrl_match,
 	},
 	.probe = u300_pmx_probe,
 	.remove = u300_pmx_remove,