arm64: dts: imx8mn-evk: Add sound-spdif card nodes

Add sound-spdif card nodes which are supported on imx8mn-evk board.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn-evk.dtsi

@@ -67,6 +67,14 @@ sound-wm8524 {
 			"Line Out Jack", "LINEVOUTL",
 			"Line Out Jack", "LINEVOUTR";
 	};
+
+	sound-spdif {
+		compatible = "fsl,imx-audio-spdif";
+		model = "imx-spdif";
+		spdif-controller = <&spdif1>;
+		spdif-out;
+		spdif-in;
+	};
 };
 
 &easrc {
@@ -164,6 +172,15 @@ &snvs_pwrkey {
 	status = "okay";
 };
 
+&spdif1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_spdif1>;
+	assigned-clocks = <&clk IMX8MN_CLK_SPDIF1>;
+	assigned-clock-parents = <&clk IMX8MN_AUDIO_PLL1_OUT>;
+	assigned-clock-rates = <24576000>;
+	status = "okay";
+};
+
 &uart2 { /* console */
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart2>;
@@ -300,6 +317,13 @@ MX8MN_IOMUXC_SAI3_TXD_SAI3_TX_DATA0     0xd6
 		>;
 	};
 
+	pinctrl_spdif1: spdif1grp {
+		fsl,pins = <
+			MX8MN_IOMUXC_SPDIF_TX_SPDIF1_OUT	0xd6
+			MX8MN_IOMUXC_SPDIF_RX_SPDIF1_IN		0xd6
+		>;
+	};
+
 	pinctrl_typec1: typec1grp {
 		fsl,pins = <
 			MX8MN_IOMUXC_SD1_STROBE_GPIO2_IO11	0x159