ASoC: dt-bindings: qcom,wsa8840: Add WSA884x family of speakers

Add binding for WSA8840/WSA8845/WSA8845H smart speaker amplifiers used
in Qualcomm QRD8550 board with SM8550 SoC.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230616115751.392886-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/qcom,wsa8840.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/qcom,wsa8840.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm WSA8840/WSA8845/WSA8845H smart speaker amplifier
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
+  - Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+
+description:
+  WSA884X is a family of Qualcomm Aqstic smart speaker amplifiers using
+  SoundWire digital audio interface.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: sdw20217020400
+
+  reg:
+    maxItems: 1
+
+  powerdown-gpios:
+    description: Powerdown/Shutdown line to use (pin SD_N)
+    maxItems: 1
+
+  '#sound-dai-cells':
+    const: 0
+
+  vdd-1p8-supply: true
+  vdd-io-supply: true
+
+required:
+  - compatible
+  - reg
+  - powerdown-gpios
+  - '#sound-dai-cells'
+  - vdd-1p8-supply
+  - vdd-io-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    soundwire-controller {
+        #address-cells = <2>;
+        #size-cells = <0>;
+
+        speaker@0,1 {
+            compatible = "sdw20217020400";
+            reg = <0 1>;
+            pinctrl-names = "default";
+            pinctrl-0 = <&spkr_2_sd_n_active>;
+            powerdown-gpios = <&lpass_tlmm 18 GPIO_ACTIVE_LOW>;
+            #sound-dai-cells = <0>;
+            sound-name-prefix = "SpkrRight";
+            vdd-1p8-supply = <&vreg_l15b_1p8>;
+            vdd-io-supply = <&vreg_l3g_1p2>;
+        };
+    };