[PATCH v3 03/18] ASoC: dt-bindings: mt6357: Add audio codec document

[Alexandre Mergnat <amergnat@baylibre.com>]

Add MT8365 audio codec bindings to set required
and optional voltage properties between the codec and the board.
The properties are:
- phandle of the requiered power supply.
- Setup of microphone bias voltage.
- Setup of the speaker pin pull-down.

Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
---
 .../devicetree/bindings/sound/mt6357.yaml          | 54 ++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/mt6357.yaml b/Documentation/devicetree/bindings/sound/mt6357.yaml
new file mode 100644
index 000000000000..381cb71b959f
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/mt6357.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/mt6357.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek MT6357 Codec
+
+maintainers:
+  - Alexandre Mergnat <amergnat@baylibre.com>
+
+description: |
+  This is the required and optional voltage properties for this subdevice.
+  The communication between MT6357 and SoC is through Mediatek PMIC wrapper.
+  For more detail, please visit Mediatek PMIC wrapper documentation.
+  Must be a child node of PMIC wrapper.
+
+properties:
+
+  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
+
+  mediatek,vaud28-supply:
+    description: 2.8 volt supply phandle for the audio codec
+
+required:
+  - mediatek,vaud28-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    codec {
+        mediatek,micbias0-microvolt = <1900000>;
+        mediatek,micbias1-microvolt = <1700000>;
+        mediatek,vaud28-supply = <&mt6357_vaud28_reg>;
+    };
+
+...

-- 
2.25.1