ASoC: dt-bindings: atmel-at91sam9g20ek: convert to json-schema

Convert atmel-at91sam9g20ek-wm8731-audio DT binding to yaml
based json-schema.Change file name to match json-scheme naming.

Signed-off-by: Balakrishnan Sambath <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/atmel,at91sam9g20ek-wm8731.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/atmel,at91sam9g20ek-wm8731.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel at91sam9g20ek wm8731 audio complex
+
+maintainers:
+  - Balakrishnan Sambath <[e-mail]>
+
+description:
+  The audio complex configuration for Atmel at91sam9g20ek with WM8731 audio codec.
+
+properties:
+  compatible:
+    const: atmel,at91sam9g20ek-wm8731-audio
+
+  atmel,model:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: The user-visible name of this sound complex.
+
+  atmel,audio-routing:
+    $ref: /schemas/types.yaml#/definitions/non-unique-string-array
+    description: A list of the connections between audio components.
+    minItems: 2
+    maxItems: 4
+    items:
+      enum:
+        # Board Connectors
+        - Ext Spk
+        - Int Mic
+
+        # CODEC Pins
+        - LOUT
+        - ROUT
+        - LHPOUT
+        - RHPOUT
+        - LLINEIN
+        - RLINEIN
+        - MICIN
+
+  atmel,ssc-controller:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: The phandle of the SSC controller.
+
+  atmel,audio-codec:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: The phandle of WM8731 audio codec.
+
+required:
+  - compatible
+  - atmel,model
+  - atmel,audio-routing
+  - atmel,ssc-controller
+  - atmel,audio-codec
+
+additionalProperties: false
+
+examples:
+  - |
+    sound {
+        compatible = "atmel,at91sam9g20ek-wm8731-audio";
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_pck0_as_mck>;
+        atmel,model = "wm8731 @ AT91SAMG20EK";
+        atmel,audio-routing =
+            "Ext Spk", "LHPOUT",
+            "Int Mic", "MICIN";
+        atmel,ssc-controller = <&ssc0>;
+        atmel,audio-codec = <&wm8731>;
+    };

Documentation/devicetree/bindings/sound/atmel-at91sam9g20ek-wm8731-audio.txt

···
-* Atmel at91sam9g20ek wm8731 audio complex
-
-Required properties:
-  - compatible: "atmel,at91sam9g20ek-wm8731-audio"
-  - atmel,model: The user-visible name of this sound complex.
-  - atmel,audio-routing: A list of the connections between audio components.
-  - atmel,ssc-controller: The phandle of the SSC controller
-  - atmel,audio-codec: The phandle of the WM8731 audio codec
-Optional properties:
-  - pinctrl-names, pinctrl-0: Please refer to pinctrl-bindings.txt
-
-Example:
-sound {
-	compatible = "atmel,at91sam9g20ek-wm8731-audio";
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_pck0_as_mck>;
-
-	atmel,model = "wm8731 @ AT91SAMG20EK";
-
-	atmel,audio-routing =
-		"Ext Spk", "LHPOUT",
-		"Int MIC", "MICIN";
-
-	atmel,ssc-controller = <&ssc0>;
-	atmel,audio-codec = <&wm8731>;
-};