ASoC: dt-bindings: Add Richtek rtq9128 audio amplifier

Create richtek,rtq9128.yaml for rtq9128 amplifier.
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/1695181834-5809-2-git-send-email-cy_huang@richtek.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/richtek,rtq9128.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/richtek,rtq9128.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Richtek RTQ9128 Automative Audio Power Amplifier
+
+maintainers:
+  - ChiYuan Huang <cy_huang@richtek.com>
+
+description:
+  The RTQ9128 is a ultra-low output noise, high-efficiency, four-channel
+  class-D audio power amplifier and delivering 4x75W into 4OHm at 10%
+  THD+N from a 25V supply in automotive applications.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - richtek,rtq9128
+
+  reg:
+    maxItems: 1
+
+  enable-gpios:
+    maxItems: 1
+
+  '#sound-dai-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - '#sound-dai-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      speaker@1a {
+        compatible = "richtek,rtq9128";
+        reg = <0x1a>;
+        enable-gpios = <&gpio 26 GPIO_ACTIVE_HIGH>;
+        #sound-dai-cells = <0>;
+      };
+    };