ASoC: dt-bindings: wm8904: Convert to dtschema

Convert the WM8904 audio CODEC bindings to DT schema.

Compared to the original binding #sound-dai-cells and the missing power
supplies are added. The latter are all required as described in the
datasheet.

Datasheet: https://statics.cirrus.com/pubs/proDatasheet/WM8904_Rev4.1.pdf
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230719121918.247397-1-francesco@dolcini.it
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/wlf,wm8904.yaml

@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/wlf,wm8904.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Wolfson WM8904/WM8912 audio codecs
+
+maintainers:
+  - patches@opensource.cirrus.com
+
+description: |
+  Pins on the device (for linking into audio routes):
+  IN1L, IN1R, IN2L, IN2R, IN3L, IN3R, HPOUTL, HPOUTR, LINEOUTL, LINEOUTR,
+  MICBIAS
+
+properties:
+  compatible:
+    enum:
+      - wlf,wm8904
+      - wlf,wm8912
+
+  reg:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: mclk
+
+  AVDD-supply: true
+  CPVDD-supply: true
+  DBVDD-supply: true
+  DCVDD-supply: true
+  MICVDD-supply: true
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - AVDD-supply
+  - CPVDD-supply
+  - DBVDD-supply
+  - DCVDD-supply
+  - MICVDD-supply
+
+allOf:
+  - $ref: dai-common.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        codec@1a {
+            compatible = "wlf,wm8904";
+            reg = <0x1a>;
+            clocks = <&pck0>;
+            clock-names = "mclk";
+            AVDD-supply = <&reg_1p8v>;
+            CPVDD-supply = <&reg_1p8v>;
+            DBVDD-supply = <&reg_1p8v>;
+            DCVDD-supply = <&reg_1p8v>;
+            MICVDD-supply = <&reg_1p8v>;
+        };
+    };