dt/bindings: drm/komeda: Add DT bindings for ARM display processor D71

Device Tree bindings for Arm Komeda display driver

Required properties:

- compatible: Should be "arm,mali-d71"

- reg: Physical base address and length of the registers in the system

- interrupts: the interrupt line number of the device in the system

- clocks: A list of phandle + clock-specifier pairs, one for each entry

    in 'clock-names'

- clock-names: A list of clock names. It should contain:

      - "mclk": for the main processor clock

      - "pclk": for the APB interface clock

- #address-cells: Must be 1

- #size-cells: Must be 0

Required properties for sub-node: pipeline@nq

Each device contains one or two pipeline sub-nodes (at least one), each

pipeline node should provide properties:

- reg: Zero-indexed identifier for the pipeline

- clocks: A list of phandle + clock-specifier pairs, one for each entry

    in 'clock-names'

- clock-names: should contain:

      - "pxclk": pixel clock

      - "aclk": AXI interface clock

- port: each pipeline connect to an encoder input port. The connection is

    modeled using the OF graph bindings specified in

    Documentation/devicetree/bindings/graph.txt

Optional properties:

  - memory-region: phandle to a node describing memory (see

    Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt)

    to be used for the framebuffer; if not present, the framebuffer may

    be located anywhere in memory.

Example:

/ {

	...

	dp0: display@c00000 {

		#address-cells = <1>;

		#size-cells = <0>;

		compatible = "arm,mali-d71";

		reg = <0xc00000 0x20000>;

		interrupts = <0 168 4>;

		clocks = <&dpu_mclk>, <&dpu_aclk>;

		clock-names = "mclk", "pclk";

		dp0_pipe0: pipeline@0 {

			clocks = <&fpgaosc2>, <&dpu_aclk>;

			clock-names = "pxclk", "aclk";

			reg = <0>;

			port {

				dp0_pipe0_out: endpoint {

					remote-endpoint = <&db_dvi0_in>;

				};

			};

		};

		dp0_pipe1: pipeline@1 {

			clocks = <&fpgaosc2>, <&dpu_aclk>;

			clock-names = "pxclk", "aclk";

			reg = <1>;

			port {

				dp0_pipe1_out: endpoint {

					remote-endpoint = <&db_dvi1_in>;

				};

			};

		};

	};

	...

};