dt-bindings: usb: hd3ss3220 device tree binding document

TI HD3SS3220 TypeC DRP Port Controller.

Required properties:

 - compatible: Must be "ti,hd3ss3220".

 - reg: I2C slave address, must be 0x47 or 0x67 based on ADDR pin.

 - interrupts: An interrupt specifier.

Required sub-node:

 - connector: The "usb-c-connector" attached to the hd3ss3220 chip. The

   bindings of the connector node are specified in:

	Documentation/devicetree/bindings/connector/usb-connector.txt

Example:

hd3ss3220@47 {

	compatible = "ti,hd3ss3220";

	reg = <0x47>;

	interrupt-parent = <&gpio6>;

	interrupts = <3 IRQ_TYPE_LEVEL_LOW>;

	connector {

		compatible = "usb-c-connector";

		label = "USB-C";

		data-role = "dual";

		ports {

			#address-cells = <1>;

			#size-cells = <0>;

			port@1 {

				reg = <1>;

				hd3ss3220_ep: endpoint {

					remote-endpoint = <&usb3_role_switch>;

				};

			};

		};

	};

};