Device Tree Configuration

The device tree of HDMI is stored in the following path:

linux-5.10/arch/riscv/boot/dts/starfive/

The following code block shows the DTS file structure for HDMI.

linux-5.15.0
└-- arch
└-- | -- riscv
| -- | -- | -- boot
| -- | -- | -- | -- dts
| -- | -- | -- | -- | -- starfive
| -- | -- | -- | -- | -- | -- jh7110-common.dtsi
| -- | -- | -- | -- | -- | -- jh7110.dtsi

The following is an example of the HDMI configuration in the file jh7110.dts.

hdmi: hdmi@29590000 {
		compatible = "starfive,jh7100-hdmi","inno,hdmi";
			reg = <0x0 0x29590000 0x0 0x4000>;
			interrupts = <99>;
			status = "disabled";
			clocks = <&clkvout JH7110_U0_HDMI_TX_CLK_SYS>,
				<&clkvout JH7110_U0_HDMI_TX_CLK_MCLK>,
				<&clkvout JH7110_U0_HDMI_TX_CLK_BCLK>,
				<&hdmitx0_pixelclk>;
			clock-names = "sysclk", "mclk","bclk","pclk";
			resets = <&rstgen RSTN_U0_HDMI_TX_HDMI>;
			reset-names = "hdmi_tx";
		};

The following list provides explanations for the parameters included in the above code block.

• compatible: Compatibility information, used to associate the driver and its target device.
• reg: Register base address "0x29590000" and range "0x4000".
• interrupts: Hardware interrupt ID.
• status: The work status of the HDMI module. To enable the module, set this bit as "okay" or to disable the module, set this bit as "disabled".
• clocks: The clocks used by the HDMI module.
• clock-names: The names of the above clocks.
• resets: The reset signals used by the HDMI module.
• reset-names: The names of the above reset signals.

The following is an example of the HDMI configuration in the file jh7110-common.dtsi.

&hdmi {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&inno_hdmi_pins>;

	hdmi_in: port {
		#address-cells = <1>;
		#size-cells = <0>;
		hdmi_in_lcdc: endpoint@0 {
			reg = <0>;
			remote-endpoint = <&dc_out_dpi1>;
		};
	};
};