ASoC: dt-bindings: mt8195: Document audio-routing and dai-link subnode

Document the dai-link subnodes and the audio-routing property, allowing
to describe machine specific audio hardware and links in device tree.

While at it, also deprecate the old properties which were previously
used with driver hardcoded configuration.

Also, since describing machine specific audio hardware and links replaces
the now deprecated old logic doing the same in a driver hardcoded fashion,
it is not allowed to have both the old and new properties together.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240416071410.75620-15-angelogioacchino.delregno@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: AngeloGioacchino Del Regno

Documentation/devicetree/bindings/sound/mt8195-mt6359.yaml

@@ -12,6 +12,9 @@ maintainers:
 description:
   This binding describes the MT8195 sound card.
 
+allOf:
+  - $ref: sound-card-common.yaml#
+
 properties:
   compatible:
     enum:
@@ -23,17 +26,46 @@ properties:
     $ref: /schemas/types.yaml#/definitions/string
     description: User specified audio sound card name
 
+  audio-routing:
+    description:
+      A list of the connections between audio components. Each entry is a
+      pair of strings, the first being the connection's sink, the second
+      being the connection's source.
+      Valid names could be the input or output widgets of audio components,
+      power supplies, MicBias of codec and the software switch.
+    minItems: 2
+    items:
+      enum:
+        # Sinks
+        - Ext Spk
+        - Headphone
+        - IN1P
+        - Left Spk
+        - Right Spk
+
+        # Sources
+        - Headset Mic
+        - HPOL
+        - HPOR
+        - Left BE_OUT
+        - Left SPO
+        - Right BE_OUT
+        - Right SPO
+        - Speaker
+
   mediatek,platform:
     $ref: /schemas/types.yaml#/definitions/phandle
     description: The phandle of MT8195 ASoC platform.
 
   mediatek,dptx-codec:
     $ref: /schemas/types.yaml#/definitions/phandle
     description: The phandle of MT8195 Display Port Tx codec node.
+    deprecated: true
 
   mediatek,hdmi-codec:
     $ref: /schemas/types.yaml#/definitions/phandle
     description: The phandle of MT8195 HDMI codec node.
+    deprecated: true
 
   mediatek,adsp:
     $ref: /schemas/types.yaml#/definitions/phandle
@@ -45,20 +77,122 @@ properties:
       A list of the desired dai-links in the sound card. Each entry is a
       name defined in the machine driver.
 
+patternProperties:
+  ".*-dai-link$":
+    type: object
+    additionalProperties: false
+    description:
+      Container for dai-link level properties and CODEC sub-nodes.
+
+    properties:
+      link-name:
+        description: Indicates dai-link name and PCM stream name
+        enum:
+          - DPTX_BE
+          - ETDM1_IN_BE
+          - ETDM2_IN_BE
+          - ETDM1_OUT_BE
+          - ETDM2_OUT_BE
+          - ETDM3_OUT_BE
+          - PCM1_BE
+
+      codec:
+        description: Holds subnode which indicates codec dai.
+        type: object
+        additionalProperties: false
+        properties:
+          sound-dai:
+            minItems: 1
+            maxItems: 2
+        required:
+          - sound-dai
+
+      dai-format:
+        description: audio format
+        enum: [ i2s, right_j, left_j, dsp_a, dsp_b ]
+
+      mediatek,clk-provider:
+        $ref: /schemas/types.yaml#/definitions/string
+        description: Indicates dai-link clock master.
+        enum: [ cpu, codec ]
+
+    required:
+      - link-name
+
 additionalProperties: false
 
 required:
   - compatible
   - mediatek,platform
 
+# Disallow legacy properties if xxx-dai-link nodes are specified
+if:
+  not:
+    patternProperties:
+      ".*-dai-link$": false
+then:
+  properties:
+    mediatek,dptx-codec: false
+    mediatek,hdmi-codec: false
+
 examples:
   - |
 
     sound: mt8195-sound {
         compatible = "mediatek,mt8195_mt6359_rt1019_rt5682";
+        model = "mt8195_r1019_5682";
         mediatek,platform = <&afe>;
         pinctrl-names = "default";
         pinctrl-0 = <&aud_pins_default>;
+
+        audio-routing =
+                "Headphone", "HPOL",
+                "Headphone", "HPOR",
+                "IN1P", "Headset Mic",
+                "Ext Spk", "Speaker";
+
+        mm-dai-link {
+                link-name = "ETDM1_IN_BE";
+                mediatek,clk-provider = "cpu";
+        };
+
+        hs-playback-dai-link {
+                link-name = "ETDM1_OUT_BE";
+                mediatek,clk-provider = "cpu";
+                codec {
+                        sound-dai = <&headset_codec>;
+                };
+        };
+
+        hs-capture-dai-link {
+                link-name = "ETDM2_IN_BE";
+                mediatek,clk-provider = "cpu";
+                codec {
+                        sound-dai = <&headset_codec>;
+                };
+        };
+
+        spk-playback-dai-link {
+                link-name = "ETDM2_OUT_BE";
+                mediatek,clk-provider = "cpu";
+                codec {
+                        sound-dai = <&spk_amplifier>;
+                };
+        };
+
+        hdmi-dai-link {
+                link-name = "ETDM3_OUT_BE";
+                codec {
+                        sound-dai = <&hdmi_tx>;
+                };
+        };
+
+        displayport-dai-link {
+                link-name = "DPTX_BE";
+                codec {
+                        sound-dai = <&dp_tx>;
+                };
+        };
     };
 
 ...