ASoC: dt-bindings: mediatek,mt8365-mt6357: Add audio sound card document

Add soundcard bindings for the MT8365 SoC with the MT6357 audio codec.
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
Link: https://patch.msgid.link/20240226-audio-i350-v7-2-6518d953a141@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/mediatek,mt8365-mt6357.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/mediatek,mt8365-mt6357.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek MT8365 ASoC sound card
+
+maintainers:
+  - Alexandre Mergnat <amergnat@baylibre.com>
+
+properties:
+  compatible:
+    const: mediatek,mt8365-mt6357
+
+  pinctrl-names:
+    minItems: 1
+    items:
+      - const: default
+      - const: dmic
+      - const: miso_off
+      - const: miso_on
+      - const: mosi_off
+      - const: mosi_on
+
+  mediatek,platform:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: The phandle of MT8365 ASoC platform.
+
+patternProperties:
+  "^dai-link-[0-9]+$":
+    type: object
+    description:
+      Container for dai-link level properties and CODEC sub-nodes.
+
+    properties:
+      codec:
+        type: object
+        description: Holds subnode which indicates codec dai.
+
+        properties:
+          sound-dai:
+            maxItems: 1
+            description: phandle of the codec DAI
+
+        additionalProperties: false
+
+      link-name:
+        description: Indicates dai-link name and PCM stream name
+        enum:
+          - I2S_IN_BE
+          - I2S_OUT_BE
+          - PCM1_BE
+          - PDM1_BE
+          - PDM2_BE
+          - PDM3_BE
+          - PDM4_BE
+          - SPDIF_IN_BE
+          - SPDIF_OUT_BE
+          - TDM_IN_BE
+          - TDM_OUT_BE
+
+      sound-dai:
+        maxItems: 1
+        description: phandle of the CPU DAI
+
+    required:
+      - link-name
+      - sound-dai
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - pinctrl-names
+  - mediatek,platform
+
+additionalProperties: false
+
+examples:
+  - |
+    sound {
+        compatible = "mediatek,mt8365-mt6357";
+        pinctrl-names = "default",
+                        "dmic",
+                        "miso_off",
+                        "miso_on",
+                        "mosi_off",
+                        "mosi_on";
+        pinctrl-0 = <&aud_default_pins>;
+        pinctrl-1 = <&aud_dmic_pins>;
+        pinctrl-2 = <&aud_miso_off_pins>;
+        pinctrl-3 = <&aud_miso_on_pins>;
+        pinctrl-4 = <&aud_mosi_off_pins>;
+        pinctrl-5 = <&aud_mosi_on_pins>;
+        mediatek,platform = <&afe>;
+
+        /* hdmi interface */
+        dai-link-0 {
+            link-name = "I2S_OUT_BE";
+            sound-dai = <&afe>;
+
+            codec {
+                sound-dai = <&it66121hdmitx>;
+            };
+        };
+    };