ASoC: dt-binding: Convert MediaTek mt8183-mt6358 to DT schema

Convert the existing text-based DT binding for MT8183 sound cards using
MT6358 and various other codecs to a DT schema.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Julien Massot <julien.massot@collabora.com>
Link: https://patch.msgid.link/20250826-mtk-dtb-warnings-v3-6-20e89886a20e@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Julien Massot

Documentation/devicetree/bindings/sound/mediatek,mt8183_mt6358_ts3a227.yaml

@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/mediatek,mt8183_mt6358_ts3a227.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek MT8183 sound card with MT6358, TS3A227, and MAX98357/RT1015 codecs
+
+maintainers:
+  - Julien Massot <julien.massot@collabora.com>
+
+description:
+  MediaTek MT8183 SoC-based sound cards using the MT6358 codec,
+  with optional TS3A227 headset codec, EC codec (via Chrome EC), and HDMI audio.
+  Speaker amplifier can be one of MAX98357A/B, RT1015, or RT1015P.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt8183_mt6358_ts3a227_max98357
+      - mediatek,mt8183_mt6358_ts3a227_max98357b
+      - mediatek,mt8183_mt6358_ts3a227_rt1015
+      - mediatek,mt8183_mt6358_ts3a227_rt1015p
+
+  mediatek,platform:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Phandle to the MT8183 ASoC platform node (e.g., AFE).
+
+  mediatek,headset-codec:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Phandle to the TS3A227 headset codec.
+
+  mediatek,ec-codec:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: |
+      Optional phandle to a ChromeOS EC codec node.
+      See bindings in google,cros-ec-codec.yaml.
+
+  mediatek,hdmi-codec:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Optional phandle to an HDMI audio codec node.
+
+required:
+  - compatible
+  - mediatek,platform
+
+additionalProperties: false
+
+examples:
+  - |
+    sound {
+        compatible = "mediatek,mt8183_mt6358_ts3a227_max98357";
+        mediatek,headset-codec = <&ts3a227>;
+        mediatek,ec-codec = <&ec_codec>;
+        mediatek,hdmi-codec = <&it6505dptx>;
+        mediatek,platform = <&afe>;
+    };
+
+...