ASoC: dt-bindings: adi,ssm2305: Convert to DT schema

Convert the SSM2305 speaker amplifier binding from text format to
DT schema to enable dtbs_check validation.

Signed-off-by: Piyush Patle <piyushpatle228@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260318130733.52477-1-piyushpatle228@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/adi,ssm2305.txt

@@ -1,14 +0,0 @@
-Analog Devices SSM2305 Speaker Amplifier
-========================================
-
-Required properties:
-  - compatible : "adi,ssm2305"
-  - shutdown-gpios : The gpio connected to the shutdown pin.
-                     The gpio signal is ACTIVE_LOW.
-
-Example:
-
-ssm2305: analog-amplifier {
-	compatible = "adi,ssm2305";
-	shutdown-gpios = <&gpio3 20 GPIO_ACTIVE_LOW>;
-};

Documentation/devicetree/bindings/sound/adi,ssm2305.yaml

@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/adi,ssm2305.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices SSM2305 Class-D Speaker Amplifier
+
+maintainers:
+  - Lars-Peter Clausen <lars@metafoo.de>
+
+description:
+  The SSM2305 is a filterless, high efficiency, mono 2.8 W Class-D
+  audio amplifier with a micropower shutdown mode controlled via a
+  dedicated active-low GPIO pin.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: adi,ssm2305
+
+  shutdown-gpios:
+    maxItems: 1
+    description:
+      GPIO connected to the shutdown pin (SD) of the SSM2305.
+      The pin is active-low; asserting it puts the device into
+      micropower shutdown mode.
+
+required:
+  - compatible
+  - shutdown-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    analog-amplifier {
+        compatible = "adi,ssm2305";
+        shutdown-gpios = <&gpio3 20 GPIO_ACTIVE_LOW>;
+    };
+
+...