ASoC: dt-bindings: ti,pcm1754: add binding documentation

The Texas Instruments PCM1754 is a simple stereo DAC without any digital
management interface but soft mute, PCM input format and 44.1 kHz
digital de-emphasis can be configured via strapping pins. Only soft mute
and PCM input format selection is currently exposed via optional GPIOs
in the driver.

Signed-off-by: Stefan Kerkmann <s.kerkmann@pengutronix.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250910-v6-12-topic-pcm1754-v2-1-0917dbe73c65@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ti,pcm1754.yaml

@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/ti,pcm1754.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments PCM1754 Stereo DAC
+
+description:
+  The PCM1754 is a simple stereo DAC that is controlled via hardware gpios.
+
+maintainers:
+  - Stefan Kerkmann <s.kerkmann@pengutronix.de>
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - ti,pcm1754
+
+  vcc-supply: true
+
+  '#sound-dai-cells':
+    const: 0
+
+  format-gpios:
+    maxItems: 1
+    description:
+      GPIO used to select the PCM format
+
+  mute-gpios:
+    maxItems: 1
+    description:
+      GPIO used to mute all outputs
+
+required:
+  - compatible
+  - '#sound-dai-cells'
+  - vcc-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    codec {
+      compatible = "ti,pcm1754";
+      #sound-dai-cells = <0>;
+
+      vcc-supply = <&vcc_reg>;
+      mute-gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
+      format-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;
+    };