ASoC: dt-bindings: fsl-audmix: Convert fsl,audmix.txt to yaml

Convert fsl,audmix.txt to yaml to let dtb check tools check audmix part.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://msgid.link/r/20240321150401.2464783-1-Frank.Li@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/fsl,audmix.txt

-NXP Audio Mixer (AUDMIX).
-
-The Audio Mixer is a on-chip functional module that allows mixing of two
-audio streams into a single audio stream. Audio Mixer has two input serial
-audio interfaces. These are driven by two Synchronous Audio interface
-modules (SAI). Each input serial interface carries 8 audio channels in its
-frame in TDM manner. Mixer mixes audio samples of corresponding channels
-from two interfaces into a single sample. Before mixing, audio samples of
-two inputs can be attenuated based on configuration. The output of the
-Audio Mixer is also a serial audio interface. Like input interfaces it has
-the same TDM frame format. This output is used to drive the serial DAC TDM
-interface of audio codec and also sent to the external pins along with the
-receive path of normal audio SAI module for readback by the CPU.
-
-The output of Audio Mixer can be selected from any of the three streams
- - serial audio input 1
- - serial audio input 2
- - mixed audio
-
-Mixing operation is independent of audio sample rate but the two audio
-input streams must have same audio sample rate with same number of channels
-in TDM frame to be eligible for mixing.
-
-Device driver required properties:
-=================================
-  - compatible		: Compatible list, contains "fsl,imx8qm-audmix"
-
-  - reg			: Offset and length of the register set for the device.
-
-  - clocks		: Must contain an entry for each entry in clock-names.
-
-  - clock-names		: Must include the "ipg" for register access.
-
-  - power-domains	: Must contain the phandle to AUDMIX power domain node
-
-  - dais		: Must contain a list of phandles to AUDMIX connected
-			  DAIs. The current implementation requires two phandles
-			  to SAI interfaces to be provided, the first SAI in the
-			  list being used to route the AUDMIX output.
-
-Device driver configuration example:
-======================================
-  audmix: audmix@59840000 {
-    compatible = "fsl,imx8qm-audmix";
-    reg = <0x0 0x59840000 0x0 0x10000>;
-    clocks = <&clk IMX8QXP_AUD_AUDMIX_IPG>;
-    clock-names = "ipg";
-    power-domains = <&pd_audmix>;
-    dais = <&sai4>, <&sai5>;
-  };

Documentation/devicetree/bindings/sound/fsl,audmix.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/fsl,audmix.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP Audio Mixer (AUDMIX).
+
+maintainers:
+  - Shengjiu Wang <shengjiu.wang@nxp.com>
+  - Frank Li <Frank.Li@nxp.com>
+
+description: |
+  The Audio Mixer is a on-chip functional module that allows mixing of two
+  audio streams into a single audio stream. Audio Mixer has two input serial
+  audio interfaces. These are driven by two Synchronous Audio interface
+  modules (SAI). Each input serial interface carries 8 audio channels in its
+  frame in TDM manner. Mixer mixes audio samples of corresponding channels
+  from two interfaces into a single sample. Before mixing, audio samples of
+  two inputs can be attenuated based on configuration. The output of the
+  Audio Mixer is also a serial audio interface. Like input interfaces it has
+  the same TDM frame format. This output is used to drive the serial DAC TDM
+  interface of audio codec and also sent to the external pins along with the
+  receive path of normal audio SAI module for readback by the CPU.
+
+  The output of Audio Mixer can be selected from any of the three streams
+    - serial audio input 1
+    - serial audio input 2
+    - mixed audio
+
+  Mixing operation is independent of audio sample rate but the two audio
+  input streams must have same audio sample rate with same number of channels
+  in TDM frame to be eligible for mixing.
+
+properties:
+  compatible:
+    const: fsl,imx8qm-audmix
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: ipg
+
+  power-domains:
+    maxItems: 1
+
+  dais:
+    description: contain a list of phandles to AUDMIX connected DAIs.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    minItems: 2
+    items:
+      - description: the AUDMIX output
+        maxItems: 1
+      - description: serial audio input 1
+        maxItems: 1
+      - description: serial audio input 2
+        maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - power-domains
+  - dais
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    audmix@59840000 {
+      compatible = "fsl,imx8qm-audmix";
+      reg = <0x59840000 0x10000>;
+      clocks = <&amix_lpcg 0>;
+      clock-names = "ipg";
+      power-domains = <&pd_audmix>;
+      dais = <&sai4>, <&sai5>;
+    };