ASoC: dt-bindings: document wcd937x Audio Codec

Document the Qualcomm WCD9370/WCD9375 Audio Codec and the
Soundwire devices than can be found on Qualcomm QCM6490 based platforms.

The Qualcomm WCD9370/WCD9375 Audio Codec communicates
with the host SoC over 2 Soundwire links to provide:
- 3 TX ADC paths with 4 differential AMIC inputs
- 6 DMIC inputs that are shared with AMIC input
- 4 Microphone BIAS
- RX paths with 4 PAs – HPHL/R, EAR and AUX
- Stereo Headphone output
- MBHC engine for Headset Detection
Signed-off-by: Prasad Kumpatla <quic_pkumpatl@quicinc.com>
Co-developed-by: Mohammad Rafi Shaik <quic_mohs@quicinc.com>
Signed-off-by: Mohammad Rafi Shaik <quic_mohs@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240524035535.3119208-2-quic_mohs@quicinc.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/qcom,wcd937x-sdw.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/qcom,wcd937x-sdw.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm SoundWire Slave devices on WCD9370/WCD9375
+
+maintainers:
+  - Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+
+description: |
+  Qualcomm WCD9370/WCD9375 Codec is a standalone Hi-Fi audio codec IC.
+  It has RX and TX Soundwire slave devices. This bindings is for the
+  slave devices.
+
+properties:
+  compatible:
+    const: sdw20217010a00
+
+  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 which are adc1_port, adc23_port,
+      dmic03_mbhc_port, dmic46_port.
+      Supports maximum 4 tx soundwire ports.
+
+      WCD9370 TX Port 1 (ADC1)               <=> SWR2 Port 2
+      WCD9370 TX Port 2 (ADC2, 3)            <=> SWR2 Port 2
+      WCD9370 TX Port 3 (DMIC0,1,2,3 & MBHC) <=> SWR2 Port 3
+      WCD9370 TX Port 4 (DMIC4,5,6,7)        <=> SWR2 Port 4
+
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 4
+    maxItems: 4
+    items:
+      enum: [1, 2, 3, 4]
+
+  qcom,rx-port-mapping:
+    description: |
+      Specifies static port mapping between device and host rx ports.
+      In the order of device port index which are hph_port, clsh_port,
+      comp_port, lo_port, dsd port.
+      Supports maximum 5 rx soundwire ports.
+
+      WCD9370 RX Port 1 (HPH_L/R)       <==>    SWR1 Port 1 (HPH_L/R)
+      WCD9370 RX Port 2 (CLSH)          <==>    SWR1 Port 2 (CLSH)
+      WCD9370 RX Port 3 (COMP_L/R)      <==>    SWR1 Port 3 (COMP_L/R)
+      WCD9370 RX Port 4 (LO)            <==>    SWR1 Port 4 (LO)
+      WCD9370 RX Port 5 (DSD_L/R)       <==>    SWR1 Port 5 (DSD)
+
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 5
+    maxItems: 5
+    items:
+      enum: [1, 2, 3, 4, 5]
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    soundwire@3210000 {
+        reg = <0x03210000 0x2000>;
+        #address-cells = <2>;
+        #size-cells = <0>;
+        wcd937x_rx: codec@0,4 {
+            compatible = "sdw20217010a00";
+            reg = <0 4>;
+            qcom,rx-port-mapping = <1 2 3 4 5>;
+        };
+    };
+
+    soundwire@3230000 {
+        reg = <0x03230000 0x2000>;
+        #address-cells = <2>;
+        #size-cells = <0>;
+        wcd937x_tx: codec@0,3 {
+            compatible = "sdw20217010a00";
+            reg = <0 3>;
+            qcom,tx-port-mapping = <2 2 3 4>;
+        };
+    };
+
+...

Documentation/devicetree/bindings/sound/qcom,wcd937x.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/qcom,wcd937x.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm WCD9370/WCD9375 Audio Codec
+
+maintainers:
+  - Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+
+description:
+  Qualcomm WCD9370/WCD9375 Codec is a standalone Hi-Fi audio codec IC.
+  It has RX and TX Soundwire slave devices.
+
+allOf:
+  - $ref: dai-common.yaml#
+  - $ref: qcom,wcd93xx-common.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - const: qcom,wcd9370-codec
+      - items:
+          - const: qcom,wcd9375-codec
+          - const: qcom,wcd9370-codec
+
+  vdd-px-supply:
+    description: A reference to the 1.8V I/O supply
+
+required:
+  - compatible
+  - vdd-px-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    codec {
+        compatible = "qcom,wcd9370-codec";
+        pinctrl-names = "default", "sleep";
+        pinctrl-0 = <&wcd_reset_n>;
+        pinctrl-1 = <&wcd_reset_n_sleep>;
+        reset-gpios = <&tlmm 83 GPIO_ACTIVE_HIGH>;
+        vdd-buck-supply = <&vreg_l17b_1p8>;
+        vdd-rxtx-supply = <&vreg_l18b_1p8>;
+        vdd-px-supply = <&vreg_l18b_1p8>;
+        vdd-mic-bias-supply = <&vreg_bob>;
+        qcom,micbias1-microvolt = <1800000>;
+        qcom,micbias2-microvolt = <1800000>;
+        qcom,micbias3-microvolt = <1800000>;
+        qcom,micbias4-microvolt = <1800000>;
+        qcom,rx-device = <&wcd937x_rx>;
+        qcom,tx-device = <&wcd937x_tx>;
+        #sound-dai-cells = <1>;
+    };
+
+    /* ... */
+
+    soundwire@3210000 {
+        reg = <0x03210000 0x2000>;
+        #address-cells = <2>;
+        #size-cells = <0>;
+        wcd937x_rx: codec@0,4 {
+            compatible = "sdw20217010a00";
+            reg = <0 4>;
+            qcom,rx-port-mapping = <1 2 3 4 5>;
+        };
+    };
+
+    soundwire@3230000 {
+        reg = <0x03230000 0x2000>;
+        #address-cells = <2>;
+        #size-cells = <0>;
+        wcd937x_tx: codec@0,3 {
+            compatible = "sdw20217010a00";
+            reg = <0 3>;
+            qcom,tx-port-mapping = <1 2 3 4>;
+        };
+    };
+...