dt-bindings: hisilicon: add doc for Hi3798CV200 peripheral controller

It adds bindings doc for Hi3798CV200 peripheral controller.
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com>

Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt

@@ -74,6 +74,29 @@ Example:
 		reboot-offset = <0x4>;
 	};
 
+-----------------------------------------------------------------------
+Hisilicon Hi3798CV200 Peripheral Controller
+
+The Hi3798CV200 Peripheral Controller controls peripherals, queries
+their status, and configures some functions of peripherals.
+
+Required properties:
+- compatible: Should contain "hisilicon,hi3798cv200-perictrl", "syscon"
+  and "simple-mfd".
+- reg: Register address and size of Peripheral Controller.
+- #address-cells: Should be 1.
+- #size-cells: Should be 1.
+
+Examples:
+
+	perictrl: peripheral-controller@8a20000 {
+		compatible = "hisilicon,hi3798cv200-perictrl", "syscon",
+			     "simple-mfd";
+		reg = <0x8a20000 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+	};
+
 -----------------------------------------------------------------------
 Hisilicon Hi6220 system controller