arm64: dts: allwinner: h6: tanix-tx6: Add SPDIF

Tanix TX6 board has SPDIF connector in form of 3.5 mm jack.

Add support for it.
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20211115201112.452696-1-jernej.skrabec@gmail.com

arch/arm64/boot/dts/allwinner/sun50i-h6-tanix-tx6.dts

@@ -52,6 +52,24 @@ reg_vdd_cpu_gpu: regulator-vdd-cpu-gpu {
 		regulator-min-microvolt = <1135000>;
 		regulator-max-microvolt = <1135000>;
 	};
+
+	sound-spdif {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "sun50i-h6-spdif";
+
+		simple-audio-card,cpu {
+			sound-dai = <&spdif>;
+		};
+
+		simple-audio-card,codec {
+			sound-dai = <&spdif_out>;
+		};
+	};
+
+	spdif_out: spdif-out {
+		#sound-dai-cells = <0>;
+		compatible = "linux,spdif-dit";
+	};
 };
 
 &cpu0 {
@@ -127,6 +145,10 @@ &r_ir {
 	status = "okay";
 };
 
+&spdif {
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_ph_pins>;