u-boot/arch/arm/dts/ulcb-audio-graph-card.dtsi

// SPDX-License-Identifier: GPL-2.0
/*
 * Device Tree for ULCB + Audio Graph Card
 *
 * Copyright (C) 2022 Renesas Electronics Corp.
 */

/*
 *	(A) CPU0 <-----> ak4613
 *	(B) CPU1  -----> HDMI
 *
 *	(A) aplay   -D plughw:0,0 xxx.wav
 *	(B) aplay   -D plughw:0,1 xxx.wav
 *
 *	(A) arecord -D plughw:0,0 xxx.wav
 */

/ {
	sound_card: sound {
		compatible = "audio-graph-card";
		label = "rcar-sound";

		dais = <&rsnd_port0 /* (A) CPU0 <-> ak4613 */
			&rsnd_port1 /* (B) CPU1  -> HDMI   */
		>;
	};
};

&ak4613 {
	#sound-dai-cells = <0>;

	port {
		/*
		 * (A) CPU0 <-> ak4613
		 */
		ak4613_endpoint: endpoint {
			remote-endpoint = <&rsnd_for_ak4613>;
		};
	};
};

&hdmi0 {
	ports {
		port@2 {
			/*
			 * (B) CPU1 -> HDMI
			 */
			dw_hdmi0_snd_in: endpoint {
				remote-endpoint = <&rsnd_for_hdmi>;
			};
		};
	};
};

&rcar_sound {
	ports {
		#address-cells = <1>;
		#size-cells = <0>;
		rsnd_port0: port@0 {
			/*
			 * (A) CPU0 <-> ak4613
			 */
			reg = <0>;
			rsnd_for_ak4613: endpoint {
				remote-endpoint = <&ak4613_endpoint>;
				bitclock-master;
				frame-master;
				playback = <&ssi0>, <&src0>, <&dvc0>;
				capture  = <&ssi1>, <&src1>, <&dvc1>;
			};
		};
		rsnd_port1: port@1 {
			/*
			 * (B) CPU1 -> HDMI
			 */
			reg = <1>;
			rsnd_for_hdmi: endpoint {
				remote-endpoint = <&dw_hdmi0_snd_in>;
				bitclock-master;
				frame-master;
				playback = <&ssi2>;
			};
		};
	};
};