ASoC: dt-bindings: ak4642: switch to yaml base Documentation

This patch switches from .txt base to .yaml base Document.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/87lfjwxlna.wl-kuninori.morimoto.gx@renesas.com
Link: https://lore.kernel.org/r/87mu4z3904.wl-kuninori.morimoto.gx@renesas.com
Link: https://lore.kernel.org/r/87wo342tds.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ak4642.txt

-AK4642 I2C transmitter
-
-This device supports I2C mode only.
-
-Required properties:
-
-  - compatible : "asahi-kasei,ak4642" or "asahi-kasei,ak4643" or "asahi-kasei,ak4648"
-  - reg : The chip select number on the I2C bus
-
-Optional properties:
-
-  - #clock-cells :		common clock binding; shall be set to 0
-  - clocks :			common clock binding; MCKI clock
-  - clock-frequency :		common clock binding; frequency of MCKO
-  - clock-output-names :	common clock binding; MCKO clock name
-
-Example 1:
-
-&i2c {
-	ak4648: ak4648@12 {
-		compatible = "asahi-kasei,ak4642";
-		reg = <0x12>;
-	};
-};
-
-Example 2:
-
-&i2c {
-	ak4643: codec@12 {
-		compatible = "asahi-kasei,ak4643";
-		reg = <0x12>;
-		#clock-cells = <0>;
-		clocks = <&audio_clock>;
-		clock-frequency = <12288000>;
-		clock-output-names = "ak4643_mcko";
-	};
-};

Documentation/devicetree/bindings/sound/ak4642.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/ak4642.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: AK4642 I2C transmitter Device Tree Bindings
+
+maintainers:
+  - Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+
+properties:
+  compatible:
+    enum:
+      - asahi-kasei,ak4642
+      - asahi-kasei,ak4643
+      - asahi-kasei,ak4648
+
+  reg:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 0
+  "#sound-dai-cells":
+    const: 0
+
+  clocks:
+    maxItems: 1
+
+  clock-frequency:
+    description: common clock binding; frequency of MCKO
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  clock-output-names:
+    description: common clock name
+    $ref: /schemas/types.yaml#/definitions/string
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        ak4643: codec@12 {
+            compatible = "asahi-kasei,ak4643";
+            #sound-dai-cells = <0>;
+            reg = <0x12>;
+            #clock-cells = <0>;
+            clocks = <&audio_clock>;
+            clock-frequency = <12288000>;
+            clock-output-names = "ak4643_mcko";
+        };
+    };