[PATCH v6 1/2] ASoC: dt-bindings: nuvoton,nau8360: Add NAU83G60

[Neo Chang <YLCHANG2@nuvoton.com>]

Add device tree bindings documentation for the Nuvoton NAU83G60
audio amplifier.

Signed-off-by: Neo Chang <YLCHANG2@nuvoton.com>
---
Changes in v6:
- Removed '|' from descriptions.
- Add firmware-name in required.
- Add "nuvoton,dsp-tx-slot-mapping" and "nuvoton,dsp-rx-slot-mapping" properties.

Changes in v5:
- Remove the detailed datasheet information, keep only the valid I2C address enum
- Simplify the firmware firmware-name items definition by removing the redundant
minItems/maxItems and moving the channel descriptions directly into individual
item entries.

Changes in v4:
- Refine the `firmware-name` description to clarify the loading order
 (Left then Right) and the PBTL mode behavior.
- Remove the "dsp bypass" option description.
- Update the example node to follow devicetree coding styles.

Changes in v3:
- Remove colon to resolve YAML build warnings.
- Fix 'firmware-name' property definition to comply with binding schemas

Changes in v2:
- Dropped the word "driver" from the description.
- Removed runtime/software configuration properties:
  nuvoton,low-latency, nuvoton,anc-enable, nuvoton,aec-enable,
  nuvoton,vbat-microvolt, and nuvoton,tdm-channel-length.
- Added missing "nuvoton,dac-cur-enable" property for static speaker impedance matching.
- Removed unnecessary '|' formatting from single-line descriptions.
- Fixed typo in firmware-name property.
---
 .../bindings/sound/nuvoton,nau8360.yaml       | 113 ++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/nuvoton,nau8360.yaml

diff --git a/Documentation/devicetree/bindings/sound/nuvoton,nau8360.yaml b/Documentation/devicetree/bindings/sound/nuvoton,nau8360.yaml
new file mode 100644
index 000000000000..3aa3df0bcb93
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/nuvoton,nau8360.yaml
@@ -0,0 +1,113 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/nuvoton,nau8360.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton NAU83G60 Stereo Class-D Amplifier with DSP
+
+description:
+  Stereo Class-D Amplifier with DSP and I/V-sense.
+  This device supports I2C.
+
+maintainers:
+  - Neo Chang <YLCHANG2@nuvoton.com>
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,nau8360
+
+  reg:
+    description: The I2C address is determined by the hardware pins.
+    enum: [0x1a, 0x1b, 0x4a, 0x4b]
+
+  "#sound-dai-cells":
+    const: 0
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: mclk
+
+  firmware-name:
+    items:
+      - description:
+          Left DSP core firmware.
+          In PBTL mode, the Left firmware is ignored and only the Right is applied.
+      - description: Right DSP core firmware.
+
+  nuvoton,pbtl-enable:
+    type: boolean
+    description: NAU83G60 supports PBTL mode for mono output.
+
+  nuvoton,dac-cur-enable:
+    type: boolean
+    description:
+      Adjust DAC output current to match speaker impedance and prevent
+      hardware damage. +3.2dB when present, 0dB by default.
+
+  nuvoton,dsp-rx-slot-mapping:
+    description:
+      Configures the TDM slot routing for DSP RX functions.
+      Each integer assigns a specific DSP internal function to a TDM slot.
+      The indices of the array correspond to the following hardware functions
+        (0) DACL
+        (1) DACR
+        (2) ANCL
+        (3) ANCR
+      Assigned slots must be unique, except 255 which disables the function.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 4
+    maxItems: 4
+    items:
+      enum: [ 0, 1, 2, 3, 4, 5, 6, 7, 255 ]
+
+  nuvoton,dsp-tx-slot-mapping:
+    description:
+      Configures the TDM slot routing for DSP TX functions.
+      Each integer assigns a specific DSP internal function to a TDM slot.
+      The indices of the array correspond to the following hardware functions
+        (0) AECL (Acoustic echo cancellation left)
+        (1) AECR (Acoustic echo cancellation right)
+        (2) ISNSL (Current sense left)
+        (3) ISNSR (Current sense right)
+        (4) VSNSL (Voltage sense left)
+        (5) VSNSR (Voltage sense right)
+        (6) TJ (Junction temperature)
+        (7) VBAT (Battery voltage)
+      Assigned slots must be unique, except 255 which disables the function.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 8
+    maxItems: 8
+    items:
+      enum: [ 0, 1, 2, 3, 4, 5, 6, 7, 255 ]
+
+required:
+  - compatible
+  - reg
+  - firmware-name
+
+allOf:
+  - $ref: dai-common.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        codec@1a {
+            compatible = "nuvoton,nau8360";
+            reg = <0x1a>;
+            #sound-dai-cells = <0>;
+            firmware-name = "NAU83G60.kcs.bin.l", "NAU83G60.kcs.bin.r";
+            nuvoton,dac-cur-enable;
+            nuvoton,pbtl-enable;
+            nuvoton,dsp-rx-slot-mapping = <0 1 2 3>;
+            nuvoton,dsp-tx-slot-mapping = <0 1 2 3 4 5 6 7>;
+        };
+    };
-- 
2.25.1