ASoC: dt-bindings: maxim,max9867: convert txt bindings to yaml

Convert from max9867.txt to maxim,max9867.yaml and add missing
'#sound-dai-cells' property.

Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230302-max9867-v2-1-fd2036d5e825@skidata.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/max9867.txt

@@ -1,17 +0,0 @@
-max9867 codec
-
-This device supports I2C mode only.
-
-Required properties:
-
-- compatible : "maxim,max9867"
-- reg : The chip select number on the I2C bus
-
-Example:
-
-&i2c {
-	max9867: max9867@18 {
-		compatible = "maxim,max9867";
-		reg = <0x18>;
-	};
-};

Documentation/devicetree/bindings/sound/maxim,max9867.yaml

@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/maxim,max9867.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim Integrated MAX9867 CODEC
+
+description: |
+  This device supports I2C only.
+  Pins on the device (for linking into audio routes):
+      * LOUT
+      * ROUT
+      * LINL
+      * LINR
+      * MICL
+      * MICR
+      * DMICL
+      * DMICR
+
+maintainers:
+  - Ladislav Michl <ladis@linux-mips.org>
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - maxim,max9867
+
+  '#sound-dai-cells':
+    const: 0
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        codec@18 {
+            compatible = "maxim,max9867";
+            #sound-dai-cells = <0>;
+            reg = <0x18>;
+        };
+    };
+...