[media] rc: Add DT bindings for hix5hd2

Signed-off-by: Guoxiong Yan <yanguoxiong@huawei.com>
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

Documentation/devicetree/bindings/media/hix5hd2-ir.txt

+Device-Tree bindings for hix5hd2 ir IP
+
+Required properties:
+	- compatible: Should contain "hisilicon,hix5hd2-ir".
+	- reg: Base physical address of the controller and length of memory
+	  mapped region.
+	- interrupts: interrupt-specifier for the sole interrupt generated by
+	  the device. The interrupt specifier format depends on the interrupt
+	  controller parent.
+	- clocks: clock phandle and specifier pair.
+	- hisilicon,power-syscon: phandle of syscon used to control power.
+
+Optional properties:
+	- linux,rc-map-name : Remote control map name.
+
+Example node:
+
+	ir: ir@f8001000 {
+		compatible = "hisilicon,hix5hd2-ir";
+		reg = <0xf8001000 0x1000>;
+		interrupts = <0 47 4>;
+		clocks = <&clock HIX5HD2_FIXED_24M>;
+		hisilicon,power-syscon = <&sysctrl>;
+		linux,rc-map-name = "rc-tivo";
+	};