ROHM BU18TL82/BU18RL82 Clockless Link-BD Serializer/Deserializer bridge bindings

Required properties:
 - compatible: "rohm,bu18tl82" or "rohm,bu18rl82"
 - reg: i2c address of the bridge
 - serdes-init-sequence: register initial code from Rohm vendor

optional properties:
 - reset-gpios: a GPIO spec for the reset pin
 - enable-gpios: a GPIO spec for the enable pin
 - power-supply: Reference to the regulator powering the serdes power supply pins
 - sel-mipi: string property for mipi dsi data stream input

Example:

/ {
	panel {
		compatible = "simple-panel";
		backlight = <&backlight>;

		display-timings {
			native-mode = <&timing0>;
			timing0: timing0 {
				clock-frequency = <87000000>;
				hactive = <1920>;
				vactive = <720>;
				hfront-porch = <32>;
				hsync-len = <10>;
				hback-porch = <22>;
				vfront-porch = <10>;
				vsync-len = <4>;
				vback-porch = <7>;
				hsync-active = <0>;
				vsync-active = <0>;
				de-active = <0>;
				pixelclk-active = <0>;
			};
		};

		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			port@0 {
				reg = <0>;
				panel0_in_i2c2_bu18rl82: endpoint {
					remote-endpoint = <&i2c2_bu18rl82_out_panel0>;
				};
			};
		};
	};
};

&dsi {
	status = "okay";

	ports {
		#address-cells = <1>;
		#size-cells = <0>;

		port@1 {
			reg = <1>;

			dsi0_out_i2c2_bu18tl82: endpoint {
				remote-endpoint = <&i2c2_bu18tl82_in_dsi0>;
			};
		};
	};
};

&i2c2 {
	status = "okay";

	bu18tl82: bu18tl82@10 {
		compatible = "rohm,bu18tl82";
		reg = <0x10>;
		pinctrl-names = "default";
		pinctrl-0 = <&ser0_rst_gpio>;
		reset-gpios = <&gpio1 RK_PA4 GPIO_ACTIVE_LOW>;
		sel-mipi;
		status = "okay";

		serdes-init-sequence = [
			/* TL82 Pattern Gen Set 1
			 * Horizontal Gray Scale 256 steps
			 */
			040A 0010
			040B 0080
			040C 0080
			040D 0080
			0444 0019
			0445 0020
			0446 001f

			...
		];

		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			port@0 {
				reg = <0>;

				i2c2_bu18tl82_in_dsi0: endpoint {
					remote-endpoint = <&dsi0_out_i2c2_bu18tl82>;
				};
			};

			port@1 {
				reg = <1>;

				i2c2_bu18tl82_out_i2c2_bu18rl82: endpoint {
					remote-endpoint = <&i2c2_bu18rl82_in_i2c2_bu18tl82>;
				};
			};
		};
	};

	bu18rl82: bu18rl82@30 {
		compatible = "rohm,bu18rl82";
		reg = <0x30>;
		status = "okay";
		serdes-init-sequence = [
			/* RL82 Pattern Gen Set
			 * Vertical Gray Scale Color Bar
			 */
			060A 00B0
			060B 00FF
			060C 00FF
			060D 00FF
			0644 0019
			0645 0020
			0646 001f
			...
		];

		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			port@0 {
				reg = <0>;

				i2c2_bu18rl82_in_i2c2_bu18tl82: endpoint {
					remote-endpoint = <&i2c2_bu18tl82_out_i2c2_bu18rl82>;
				};
			};

			port@1 {
				reg = <1>;

				i2c2_bu18rl82_out_panel0: endpoint {
					remote-endpoint = <&panel0_in_i2c2_bu18rl82>;
				};
			};
		};
	};
};