ASoC: dt-bindings: imx-audio-spdif: convert to YAML

Convert the imx-audio-spdif binding to YAML.

When testing dtbs_check, found below compatible strings
are not listed in document:

fsl,imx-sabreauto-spdif
fsl,imx6sx-sdb-spdif

So add them in yaml file to pass the test.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/1712830305-31350-2-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: TE-N-ShengjiuWang

Documentation/devicetree/bindings/sound/fsl,imx-audio-spdif.yaml

@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/fsl,imx-audio-spdif.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX audio complex with S/PDIF transceiver
+
+maintainers:
+  - Shengjiu Wang <shengjiu.wang@nxp.com>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - fsl,imx-sabreauto-spdif
+              - fsl,imx6sx-sdb-spdif
+          - const: fsl,imx-audio-spdif
+      - enum:
+          - fsl,imx-audio-spdif
+
+  model:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: User specified audio sound card name
+
+  spdif-controller:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: The phandle of the i.MX S/PDIF controller
+
+  spdif-out:
+    type: boolean
+    description:
+      If present, the transmitting function of S/PDIF will be enabled,
+      indicating there's a physical S/PDIF out connector or jack on the
+      board or it's connecting to some other IP block, such as an HDMI
+      encoder or display-controller.
+
+  spdif-in:
+    type: boolean
+    description:
+      If present, the receiving function of S/PDIF will be enabled,
+      indicating there is a physical S/PDIF in connector/jack on the board.
+
+required:
+  - compatible
+  - model
+  - spdif-controller
+
+anyOf:
+  - required:
+      - spdif-in
+  - required:
+      - spdif-out
+
+additionalProperties: false
+
+examples:
+  - |
+    sound-spdif {
+        compatible = "fsl,imx-audio-spdif";
+        model = "imx-spdif";
+        spdif-controller = <&spdif>;
+        spdif-out;
+        spdif-in;
+    };