arm64: dts: renesas: hihope-common: Add HDMI audio support

This patch adds support for HDMI audio to the device tree
common to the HiHope RZ/G2M and the HiHope RZ/G2N.
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/hihope-common.dtsi

@@ -81,6 +81,14 @@ reg_3p3v: regulator1 {
 		regulator-always-on;
 	};
 
+	sound_card: sound {
+		compatible = "audio-graph-card";
+
+		label = "rcar-sound";
+
+		dais = <&rsnd_port0>;
+	};
+
 	vbus0_usb2: regulator-vbus0-usb2 {
 		compatible = "regulator-fixed";
 
@@ -129,6 +137,10 @@ x304_clk: x304-clock {
 	};
 };
 
+&audio_clk_a {
+	clock-frequency = <22579200>;
+};
+
 &du {
 	clocks = <&cpg CPG_MOD 724>,
 		 <&cpg CPG_MOD 723>,
@@ -176,6 +188,12 @@ rcar_dw_hdmi0_out: endpoint {
 				remote-endpoint = <&hdmi0_con>;
 			};
 		};
+		port@2 {
+			reg = <2>;
+			dw_hdmi0_snd_in: endpoint {
+				remote-endpoint = <&rsnd_endpoint0>;
+			};
+		};
 	};
 };
 
@@ -272,6 +290,11 @@ sdhi3_pins: sd3 {
 		power-source = <1800>;
 	};
 
+	sound_clk_pins: sound_clk {
+		groups = "audio_clk_a_a";
+		function = "audio_clk";
+	};
+
 	usb0_pins: usb0 {
 		groups = "usb0";
 		function = "usb0";
@@ -295,6 +318,30 @@ usb30_pins: usb30 {
 	};
 };
 
+&rcar_sound {
+	pinctrl-0 = <&sound_clk_pins>;
+	pinctrl-names = "default";
+
+	status = "okay";
+
+	/* Single DAI */
+	#sound-dai-cells = <0>;
+
+	ports {
+		rsnd_port0: port@0 {
+			rsnd_endpoint0: endpoint {
+				remote-endpoint = <&dw_hdmi0_snd_in>;
+
+				dai-format = "i2s";
+				bitclock-master = <&rsnd_endpoint0>;
+				frame-master = <&rsnd_endpoint0>;
+
+				playback = <&ssi2>;
+			};
+		};
+	};
+};
+
 &rwdt {
 	timeout-sec = <60>;
 	status = "okay";