thermal: rcar: add Device Tree support

Support for loading the Renesas R-Car thermal module via devicetree.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

Documentation/devicetree/bindings/thermal/rcar-thermal.txt

+* Renesas R-Car Thermal
+
+Required properties:
+- compatible		: "renesas,rcar-thermal"
+- reg			: Address range of the thermal registers.
+			  The 1st reg will be recognized as common register
+			  if it has "interrupts".
+
+Option properties:
+
+- interrupts		: use interrupt
+
+Example (non interrupt support):
+
+thermal@e61f0100 {
+	compatible = "renesas,rcar-thermal";
+	reg = <0xe61f0100 0x38>;
+};
+
+Example (interrupt support):
+
+thermal@e61f0000 {
+	compatible = "renesas,rcar-thermal";
+	reg = <0xe61f0000 0x14
+		0xe61f0100 0x38
+		0xe61f0200 0x38
+		0xe61f0300 0x38>;
+	interrupts = <0 69 4>;
+};

drivers/thermal/rcar_thermal.c

@@ -476,9 +476,16 @@ static int rcar_thermal_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id rcar_thermal_dt_ids[] __devinitconst = {
+	{ .compatible = "renesas,rcar-thermal", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
+
 static struct platform_driver rcar_thermal_driver = {
 	.driver	= {
 		.name	= "rcar_thermal",
+		.of_match_table = rcar_thermal_dt_ids,
 	},
 	.probe		= rcar_thermal_probe,
 	.remove		= rcar_thermal_remove,