Add audio support for the MediaTek Genio 350-evk

Merge series from Alexandre Mergnat <amergnat@baylibre.com>:

This serie aim to add the following audio support for the Genio 350-evk:
- Playback
  - 2ch Headset Jack (Earphone)
  - 1ch Line-out Jack (Speaker)
  - 8ch HDMI Tx
- Capture
  - 1ch DMIC (On-board Digital Microphone)
  - 1ch AMIC (On-board Analogic Microphone)
  - 1ch Headset Jack (External Analogic Microphone)

Of course, HDMI playback need the MT8365 display patches [1] and a DTS
change documented in "mediatek,mt8365-mt6357.yaml".

Applied patch:
- mfd: mt6397-core: register mt6357 sound codec

Test passed:
- mixer-test log: [3]
- pcm-test log: [4]

[1]: https://lore.kernel.org/all/20231023-display-support-v1-0-5c860ed5c33b@baylibre.com/
[2]: https://lore.kernel.org/all/20240313110147.1267793-1-angelogioacchino.delregno@collabora.com/
[3]: https://pastebin.com/pc43AVrT
[4]: https://pastebin.com/cCtGhDpg
[5]: https://gitlab.baylibre.com/baylibre/mediatek/bsp/linux/-/commits/sound/for-next/add-i350-audio-support

3 files changed, 258 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml b/Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml
index 37423c2e0fdf..b67fbe0e7a63 100644
--- a/Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml
+++ b/Documentation/devicetree/bindings/mfd/mediatek,mt6357.yaml
@@ -37,6 +37,24 @@ properties:
   "#interrupt-cells":
     const: 2
 
+  mediatek,hp-pull-down:
+    description:
+      Earphone driver positive output stage short to
+      the audio reference ground.
+    type: boolean
+
+  mediatek,micbias0-microvolt:
+    description: Selects MIC Bias 0 output voltage.
+    enum: [1700000, 1800000, 1900000, 2000000,
+           2100000, 2500000, 2600000, 2700000]
+    default: 1700000
+
+  mediatek,micbias1-microvolt:
+    description: Selects MIC Bias 1 output voltage.
+    enum: [1700000, 1800000, 1900000, 2000000,
+           2100000, 2500000, 2600000, 2700000]
+    default: 1700000
+
   regulators:
     type: object
     $ref: /schemas/regulator/mediatek,mt6357-regulator.yaml
@@ -83,6 +101,9 @@ examples:
             interrupt-controller;
             #interrupt-cells = <2>;
 
+            mediatek,micbias0-microvolt = <1700000>;
+            mediatek,micbias1-microvolt = <1700000>;
+
             regulators {
                 mt6357_vproc_reg: buck-vproc {
                     regulator-name = "vproc";
diff --git a/Documentation/devicetree/bindings/sound/mediatek,mt8365-afe.yaml b/Documentation/devicetree/bindings/sound/mediatek,mt8365-afe.yaml
new file mode 100644
index 000000000000..45ad56d37234
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/mediatek,mt8365-afe.yaml
@@ -0,0 +1,130 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/mediatek,mt8365-afe.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Audio Front End PCM controller for MT8365
+
+maintainers:
+  - Alexandre Mergnat <amergnat@baylibre.com>
+
+properties:
+  compatible:
+    const: mediatek,mt8365-afe-pcm
+
+  reg:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+  clocks:
+    items:
+      - description: 26M clock
+      - description: mux for audio clock
+      - description: audio i2s0 mck
+      - description: audio i2s1 mck
+      - description: audio i2s2 mck
+      - description: audio i2s3 mck
+      - description: engen 1 clock
+      - description: engen 2 clock
+      - description: audio 1 clock
+      - description: audio 2 clock
+      - description: mux for i2s0
+      - description: mux for i2s1
+      - description: mux for i2s2
+      - description: mux for i2s3
+
+  clock-names:
+    items:
+      - const: top_clk26m_clk
+      - const: top_audio_sel
+      - const: audio_i2s0_m
+      - const: audio_i2s1_m
+      - const: audio_i2s2_m
+      - const: audio_i2s3_m
+      - const: engen1
+      - const: engen2
+      - const: aud1
+      - const: aud2
+      - const: i2s0_m_sel
+      - const: i2s1_m_sel
+      - const: i2s2_m_sel
+      - const: i2s3_m_sel
+
+  interrupts:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  mediatek,dmic-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Indicates how many data pins are used to transmit two channels of PDM
+      signal. 1 means two wires, 0 means one wire. Default value is 0.
+    enum:
+      - 0 # one wire
+      - 1 # two wires
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - interrupts
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mediatek,mt8365-clk.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/power/mediatek,mt8365-power.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        audio-controller@11220000 {
+            compatible = "mediatek,mt8365-afe-pcm";
+            reg = <0 0x11220000 0 0x1000>;
+            #sound-dai-cells = <0>;
+            clocks = <&clk26m>,
+                     <&topckgen CLK_TOP_AUDIO_SEL>,
+                     <&topckgen CLK_TOP_AUD_I2S0_M>,
+                     <&topckgen CLK_TOP_AUD_I2S1_M>,
+                     <&topckgen CLK_TOP_AUD_I2S2_M>,
+                     <&topckgen CLK_TOP_AUD_I2S3_M>,
+                     <&topckgen CLK_TOP_AUD_ENGEN1_SEL>,
+                     <&topckgen CLK_TOP_AUD_ENGEN2_SEL>,
+                     <&topckgen CLK_TOP_AUD_1_SEL>,
+                     <&topckgen CLK_TOP_AUD_2_SEL>,
+                     <&topckgen CLK_TOP_APLL_I2S0_SEL>,
+                     <&topckgen CLK_TOP_APLL_I2S1_SEL>,
+                     <&topckgen CLK_TOP_APLL_I2S2_SEL>,
+                     <&topckgen CLK_TOP_APLL_I2S3_SEL>;
+            clock-names = "top_clk26m_clk",
+                          "top_audio_sel",
+                          "audio_i2s0_m",
+                          "audio_i2s1_m",
+                          "audio_i2s2_m",
+                          "audio_i2s3_m",
+                          "engen1",
+                          "engen2",
+                          "aud1",
+                          "aud2",
+                          "i2s0_m_sel",
+                          "i2s1_m_sel",
+                          "i2s2_m_sel",
+                          "i2s3_m_sel";
+            interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_LOW>;
+            power-domains = <&spm MT8365_POWER_DOMAIN_AUDIO>;
+            mediatek,dmic-mode = <1>;
+        };
+    };
+
+...
diff --git a/Documentation/devicetree/bindings/sound/mediatek,mt8365-mt6357.yaml b/Documentation/devicetree/bindings/sound/mediatek,mt8365-mt6357.yaml
new file mode 100644
index 000000000000..ff9ebb63a05f
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/mediatek,mt8365-mt6357.yaml
@@ -0,0 +1,107 @@
+# 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>;
+            };
+        };
+    };