android10/kernel/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.txt

Mediatek HDMI Encoder
=====================

The Mediatek HDMI encoder can generate HDMI 1.4a or MHL 2.0 signals from
its parallel input.

Required properties:
- compatible: Should be "mediatek,<chip>-hdmi".
- reg: Physical base address and length of the controller's registers
- interrupts: The interrupt signal from the function block.
- clocks: device clocks
  See Documentation/devicetree/bindings/clock/clock-bindings.txt for details.
- clock-names: must contain "pixel", "pll", "bclk", and "spdif".
- phys: phandle link to the HDMI PHY node.
  See Documentation/devicetree/bindings/phy/phy-bindings.txt for details.
- phy-names: must contain "hdmi"
- mediatek,syscon-hdmi: phandle link and register offset to the system
  configuration registers. For mt8173 this must be offset 0x900 into the
  MMSYS_CONFIG region: <&mmsys 0x900>.
- ports: A node containing input and output port nodes with endpoint
  definitions as documented in Documentation/devicetree/bindings/graph.txt.
- port@0: The input port in the ports node should be connected to a DPI output
  port.
- port@1: The output port in the ports node should be connected to the input
  port of a connector node that contains a ddc-i2c-bus property, or to the
  input port of an attached bridge chip, such as a SlimPort transmitter.

HDMI CEC
========

The HDMI CEC controller handles hotplug detection and CEC communication.

Required properties:
- compatible: Should be "mediatek,<chip>-cec"
- reg: Physical base address and length of the controller's registers
- interrupts: The interrupt signal from the function block.
- clocks: device clock

HDMI DDC
========

The HDMI DDC i2c controller is used to interface with the HDMI DDC pins.
The Mediatek's I2C controller is used to interface with I2C devices.

Required properties:
- compatible: Should be "mediatek,<chip>-hdmi-ddc"
- reg: Physical base address and length of the controller's registers
- clocks: device clock
- clock-names: Should be "ddc-i2c".

HDMI PHY
========

The HDMI PHY serializes the HDMI encoder's three channel 10-bit parallel
output and drives the HDMI pads.

Required properties:
- compatible: "mediatek,<chip>-hdmi-phy"
- reg: Physical base address and length of the module's registers
- clocks: PLL reference clock
- clock-names: must contain "pll_ref"
- clock-output-names: must be "hdmitx_dig_cts" on mt8173
- #phy-cells: must be <0>
- #clock-cells: must be <0>

Optional properties:
- mediatek,ibias: TX DRV bias current for <1.65Gbps, defaults to 0xa
- mediatek,ibias_up: TX DRV bias current for >1.65Gbps, defaults to 0x1c

Example:

cec: cec@10013000 {
	compatible = "mediatek,mt8173-cec";
	reg = <0 0x10013000 0 0xbc>;
	interrupts = <GIC_SPI 167 IRQ_TYPE_LEVEL_LOW>;
	clocks = <&infracfg CLK_INFRA_CEC>;
};

hdmi_phy: hdmi-phy@10209100 {
	compatible = "mediatek,mt8173-hdmi-phy";
	reg = <0 0x10209100 0 0x24>;
	clocks = <&apmixedsys CLK_APMIXED_HDMI_REF>;
	clock-names = "pll_ref";
	clock-output-names = "hdmitx_dig_cts";
	mediatek,ibias = <0xa>;
	mediatek,ibias_up = <0x1c>;
	#clock-cells = <0>;
	#phy-cells = <0>;
};

hdmi_ddc0: i2c@11012000 {
	compatible = "mediatek,mt8173-hdmi-ddc";
	reg = <0 0x11012000 0 0x1c>;
	interrupts = <GIC_SPI 81 IRQ_TYPE_LEVEL_LOW>;
	clocks = <&pericfg CLK_PERI_I2C5>;
	clock-names = "ddc-i2c";
};

hdmi0: hdmi@14025000 {
	compatible = "mediatek,mt8173-hdmi";
	reg = <0 0x14025000 0 0x400>;
	interrupts = <GIC_SPI 206 IRQ_TYPE_LEVEL_LOW>;
	clocks = <&mmsys CLK_MM_HDMI_PIXEL>,
		 <&mmsys CLK_MM_HDMI_PLLCK>,
		 <&mmsys CLK_MM_HDMI_AUDIO>,
		 <&mmsys CLK_MM_HDMI_SPDIF>;
	clock-names = "pixel", "pll", "bclk", "spdif";
	pinctrl-names = "default";
	pinctrl-0 = <&hdmi_pin>;
	phys = <&hdmi_phy>;
	phy-names = "hdmi";
	mediatek,syscon-hdmi = <&mmsys 0x900>;
	assigned-clocks = <&topckgen CLK_TOP_HDMI_SEL>;
	assigned-clock-parents = <&hdmi_phy>;

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

		port@0 {
			reg = <0>;

			hdmi0_in: endpoint {
				remote-endpoint = <&dpi0_out>;
			};
		};

		port@1 {
			reg = <1>;

			hdmi0_out: endpoint {
				remote-endpoint = <&hdmi_con_in>;
			};
		};
	};
};

connector {
	compatible = "hdmi-connector";
	type = "a";
	ddc-i2c-bus = <&hdmiddc0>;

	port {
		hdmi_con_in: endpoint {
			remote-endpoint = <&hdmi0_out>;
		};
	};
};