ASoC: dt-bindings: document WCD939x Audio Codec

Document the Qualcomm WCD9390/WCD9395 Audio Codec and the
Soundwire devices than can be found on Qualcomm SM8650 based platforms.

The Qualcomm WCD9390/WCD9395 Audio Codec communicates
with the host SoC over 2 Soundwire links to provide:
- 4 ADC inputs for up to 5 Analog Microphones
- 4 DMIC inputs for up to 8 Digital Microphones
- 4 Microphone BIAS
- Stereo Headphone output
- Mono EAR output
- MBHC engine for Headset Detection

The WCD9390/WCD9395 IC has separate I2C subsystem for USB-C
DP Altmode/Audio Accessory mode Mux which is not documented
here but requires port/endpoint graph and properties to handle
Altmode/Audio Accessory switch and orientation.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://msgid.link/r/20231219-topic-sm8650-upstream-wcd939x-codec-v4-2-1c3bbff2d7ab@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 69 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/qcom,wcd939x-sdw.yaml b/Documentation/devicetree/bindings/sound/qcom,wcd939x-sdw.yaml
new file mode 100644
index 000000000000..67ed7701b5d6
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/qcom,wcd939x-sdw.yaml
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/qcom,wcd939x-sdw.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm SoundWire devices on WCD9390/WCD9395
+
+maintainers:
+  - Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+
+description: |
+  Qualcomm WCD9390/WCD9395 Codec is a standalone Hi-Fi audio codec IC.
+  It has RX and TX Soundwire devices. This bindings is for the devices.
+
+properties:
+  compatible:
+    const: sdw20217010e00
+
+  reg:
+    maxItems: 1
+
+  qcom,tx-port-mapping:
+    description: |
+      Specifies static port mapping between device and host tx ports.
+      In the order of the device port index.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 4
+    maxItems: 4
+
+  qcom,rx-port-mapping:
+    description: |
+      Specifies static port mapping between device and host rx ports.
+      In the order of device port index.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 6
+    maxItems: 6
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    soundwire@3210000 {
+        #address-cells = <2>;
+        #size-cells = <0>;
+        reg = <0x03210000 0x2000>;
+        wcd938x_rx: codec@0,4 {
+            compatible = "sdw20217010e00";
+            reg = <0 4>;
+            qcom,rx-port-mapping = <1 2 3 4 5 6>;
+        };
+    };
+
+    soundwire@3230000 {
+        #address-cells = <2>;
+        #size-cells = <0>;
+        reg = <0x03230000 0x2000>;
+        wcd938x_tx: codec@0,3 {
+            compatible = "sdw20217010e00";
+            reg = <0 3>;
+            qcom,tx-port-mapping = <2 3 4 5>;
+        };
+    };
+
+...