ASoC: dt-bindings: meson: convert axg spdif output to schema

Convert the DT binding documentation for the Amlogic axg spdif output to
schema.

Signed-off-by: Jerome Brunet <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/amlogic,axg-spdifout.txt

···
-* Amlogic Audio SPDIF Output
-
-Required properties:
-- compatible: 'amlogic,axg-spdifout' or
-	      'amlogic,g12a-spdifout' or
-	      'amlogic,sm1-spdifout'
-- clocks: list of clock phandle, one for each entry clock-names.
-- clock-names: should contain the following:
-  * "pclk" : peripheral clock.
-  * "mclk" : master clock
-- #sound-dai-cells: must be 0.
-
-Optional property:
-- resets: phandle to the dedicated reset line of the spdif output.
-
-Example on the A113 SoC:
-
-spdifout: audio-controller@480 {
-	compatible = "amlogic,axg-spdifout";
-	reg = <0x0 0x480 0x0 0x50>;
-	#sound-dai-cells = <0>;
-	clocks = <&clkc_audio AUD_CLKID_SPDIFOUT>,
-		 <&clkc_audio AUD_CLKID_SPDIFOUT_CLK>;
-	clock-names = "pclk", "mclk";
-};

Documentation/devicetree/bindings/sound/amlogic,axg-spdifout.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/amlogic,axg-spdifout.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic Audio AXG SPDIF Output
+
+maintainers:
+  - Jerome Brunet <[e-mail]>
+
+properties:
+  compatible:
+    oneOf:
+      - const: amlogic,axg-spdifout
+      - items:
+          - enum:
+              - amlogic,g12a-spdifout
+              - amlogic,sm1-spdifout
+          - const: amlogic,axg-spdifout
+
+  reg:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+  clocks:
+    items:
+      - description: Peripheral clock
+      - description: SPDIF output master clock
+
+  clock-names:
+    items:
+      - const: pclk
+      - const: mclk
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - "#sound-dai-cells"
+  - clocks
+  - clock-names
+
+allOf:
+  - $ref: dai-common.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amlogic,g12a-spdifout
+              - amlogic,sm1-spdifout
+    then:
+      required:
+        - resets
+
+    else:
+      properties:
+        resets: false
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/axg-audio-clkc.h>
+
+    audio-controller@480 {
+        compatible = "amlogic,axg-spdifout";
+        reg = <0x480 0x50>;
+        #sound-dai-cells = <0>;
+        clocks = <&clkc_audio AUD_CLKID_SPDIFOUT>,
+                 <&clkc_audio AUD_CLKID_SPDIFOUT_CLK>;
+        clock-names = "pclk", "mclk";
+    };