ASoC: dt-bindings: Add bindings for Richtek rt9123p

Document the ASoC Richtek rt9123p.

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://patch.msgid.link/0c80e1c6165fee5e9884d541167eee0a7f676c06.1744245663.git.cy_huang@richtek.com
Reviewed-by: "Rob Herring (Arm)" <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/richtek,rt9123p.yaml

@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/richtek,rt9123p.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Richtek RT9123P Audio Amplifier
+
+maintainers:
+  - ChiYuan Huang <cy_huang@richtek.com>
+
+description:
+  RT9123P is a RT9123 variant which does not support I2C control.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - richtek,rt9123p
+
+  '#sound-dai-cells':
+    const: 0
+
+  enable-gpios:
+    maxItems: 1
+
+  enable-delay-ms:
+    description:
+      Delay time for 'ENABLE' pin changes intended to make I2S clocks ready to
+      prevent speaker pop noise. The unit is in millisecond.
+
+required:
+  - compatible
+  - '#sound-dai-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    amplifier {
+        compatible = "richtek,rt9123p";
+        enable-gpios = <&gpio 26 GPIO_ACTIVE_HIGH>;
+        #sound-dai-cells = <0>;
+    };