Add a DT schema for describing nau8325 audio amplifiers. The key features are as follows: - Low SPK_VDD Quiescent Current - Gain Setting with 2-wire interface - Powerful Stereo Class-D Amplifier - Low Output Noise - Low Current Shutdown Mode - Click-and Pop Suppression More resources : https://www.nuvoton.com/products/smart-home-audio/audio-amplifiers/class-d-series/nau8325yg/ Signed-off-by: Seven Lee <wtli@xxxxxxxxxxx> --- .../bindings/sound/nuvoton,nau8325.yaml | 90 +++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/nuvoton,nau8325.yaml diff --git a/Documentation/devicetree/bindings/sound/nuvoton,nau8325.yaml b/Documentation/devicetree/bindings/sound/nuvoton,nau8325.yaml new file mode 100644 index 000000000000..6ded94c0e644 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/nuvoton,nau8325.yaml @@ -0,0 +1,90 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/sound/nuvoton,nau8325.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: NAU8325 audio Amplifier + +maintainers: + - Seven Lee <WTLI@xxxxxxxxxxx> + +allOf: + - $ref: dai-common.yaml# + +properties: + compatible: + const: nuvoton,nau8325 + + reg: + maxItems: 1 + + nuvoton,vref-impedance: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + The vref impedance to be used in kohms. Middle of voltage enables + Tie-Off selection options. Due to the high impedance of the VREF + pin, it is important to use a low-leakage capacitor. Possible + values are 0, 1, 2, and 3 as per the below, + + 0 = Disable tie off resistance + 1 = 25 kohms + 2 = 125 kohms + 3 = 2.5 kohms + enum: [ 0, 1, 2, 3 ] + + nuvoton,dac-vref: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + The dac vref to be used in voltage. DAC reference voltage setting. Can + be used for minor tuning of the output level. Possible values are 0, 1, + 2, and 3 as per the below, + + 0 = VDDA + 1 = VDDA * 1.5 + 2 = VDDA * 1.6 + 3 = VDDA * 1.7 + enum: [ 0, 1, 2, 3 ] + + nuvoton,alc-enable: + description: + Enable digital automatic level control (ALC) function. + type: boolean + + nuvoton,clock-detection-disable: + description: + When clock detection is enabled, it will detect whether MCLK + and FS are within the range. MCLK range is from 2.048MHz to 24.576MHz. + FS range is from 8kHz to 96kHz. And also needs to detect the ratio + MCLK_SRC/LRCK of 256, 400 or 500, and needs to detect the BCLK + to make sure data is present. There needs to be at least 8 BCLK + cycles per Frame Sync. + type: boolean + + nuvoton,clock-det-data: + description: + Request clock detection to require 2048 non-zero samples before enabling + the audio paths. If set then non-zero samples is required, otherwise it + doesn't matter. + type: boolean + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + codec@21 { + compatible = "nuvoton,nau8325"; + reg = <0x21>; + nuvoton,vref-impedance = <2>; + nuvoton,dac-vref = <2>; + nuvoton,alc-enable; + nuvoton,clock-det-data; + }; + }; -- 2.25.1
