ASoC: dt-bindings: sophgo,cv1800b: add ADC/DAC codec

Document the internal ADC and DAC audio codecs integrated
in the Sophgo CV1800B SoC.

Signed-off-by: Anton D. Stavinskii <stavinsky@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260120-cv1800b-i2s-driver-v4-3-6ef787dc6426@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/sophgo,cv1800b-codecs.yaml b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-codecs.yaml
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+++ b/Documentation/devicetree/bindings/sound/sophgo,cv1800b-codecs.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/sophgo,cv1800b-codecs.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV1800B Internal ADC/DAC Codec
+
+maintainers:
+  - Anton D. Stavinskii <stavinsky@gmail.com>
+
+description:
+  Internal ADC and DAC audio codecs integrated in the Sophgo CV1800B SoC.
+  Codecs expose a single DAI and are intended to be connected
+  to an I2S/TDM controller via an ASoC machine driver.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - sophgo,cv1800b-sound-adc
+      - sophgo,cv1800b-sound-dac
+
+  reg:
+    maxItems: 1
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - "#sound-dai-cells"
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    audio-codec@300a100 {
+      compatible = "sophgo,cv1800b-sound-adc";
+      reg = <0x0300a100 0x100>;
+      #sound-dai-cells = <0>;
+    };
+...