arm64: dts: rockchip: add SPDIF node for rk3399-firefly

This patch adds the SPDIF sound node and related settings
for rk3399-firefly.
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Link: https://lore.kernel.org/r/20210613215237.830160-1-pbrobinson@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-firefly.dts

@@ -151,6 +151,23 @@ sdio_pwrseq: sdio-pwrseq {
 		reset-gpios = <&gpio0 RK_PB2 GPIO_ACTIVE_LOW>;
 	};
 
+	sound-dit {
+		compatible = "audio-graph-card";
+		label = "SPDIF";
+		dais = <&spdif_p0>;
+	};
+
+	spdif-dit {
+		compatible = "linux,spdif-dit";
+		#sound-dai-cells = <0>;
+
+		port {
+			dit_p0_0: endpoint {
+				remote-endpoint = <&spdif_p0_0>;
+			};
+		};
+	};
+
 	/* switched by pmic_sleep */
 	vcc1v8_s3: vcca1v8_s3: vcc1v8-s3 {
 		compatible = "regulator-fixed";
@@ -710,6 +727,17 @@ &sdhci {
 	status = "okay";
 };
 
+&spdif {
+	pinctrl-0 = <&spdif_bus_1>;
+	status = "okay";
+
+	spdif_p0: port {
+		spdif_p0_0: endpoint {
+			remote-endpoint = <&dit_p0_0>;
+		};
+	};
+};
+
 &tcphy0 {
 	status = "okay";
 };