tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
1
fork

Configure Feed

Select the types of activity you want to include in your feed.

ASoC: dt-bindings: Added schema for "nuvoton,nau8325"

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@nuvoton.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://msgid.link/r/20240327075755.3410381-2-wtli@nuvoton.com
Signed-off-by: Mark Brown <broonie@kernel.org>

authored by

Seven Lee and committed by
Mark Brown 2e4c003b 559aebe4

+80
+80
Documentation/devicetree/bindings/sound/nuvoton,nau8325.yaml
··· 1 + # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 + %YAML 1.2 3 + --- 4 + $id: http://devicetree.org/schemas/sound/nuvoton,nau8325.yaml# 5 + $schema: http://devicetree.org/meta-schemas/core.yaml# 6 + 7 + title: NAU8325 audio Amplifier 8 + 9 + maintainers: 10 + - Seven Lee <WTLI@nuvoton.com> 11 + 12 + allOf: 13 + - $ref: dai-common.yaml# 14 + 15 + properties: 16 + compatible: 17 + const: nuvoton,nau8325 18 + 19 + reg: 20 + maxItems: 1 21 + 22 + nuvoton,vref-impedance-ohms: 23 + description: 24 + The vref impedance to be used in ohms. Middle of voltage enables 25 + Tie-Off selection options. Due to the high impedance of the VREF 26 + pin, it is important to use a low-leakage capacitor. 27 + 28 + enum: [0, 25000, 125000, 2500] 29 + 30 + nuvoton,dac-vref-microvolt: 31 + description: 32 + The DAC vref to be used in voltage. DAC reference voltage setting. Can 33 + be used for minor tuning of the output level. Since the VDDA is range 34 + between 1.62 to 1.98 voltage, the typical value for design is 1.8V. After 35 + the minor tuning, the final microvolt are as the below. 36 + 37 + enum: [1800000, 2700000, 2880000, 3060000] 38 + 39 + nuvoton,alc-enable: 40 + description: 41 + Enable digital automatic level control (ALC) function. 42 + type: boolean 43 + 44 + nuvoton,clock-detection-disable: 45 + description: 46 + When clock detection is enabled, it will detect whether MCLK 47 + and FS are within the range. MCLK range is from 2.048MHz to 24.576MHz. 48 + FS range is from 8kHz to 96kHz. And also needs to detect the ratio 49 + MCLK_SRC/LRCK of 256, 400 or 500, and needs to detect the BCLK 50 + to make sure data is present. There needs to be at least 8 BCLK 51 + cycles per Frame Sync. 52 + type: boolean 53 + 54 + nuvoton,clock-det-data: 55 + description: 56 + Request clock detection to require 2048 non-zero samples before enabling 57 + the audio paths. If set then non-zero samples is required, otherwise it 58 + doesn't matter. 59 + type: boolean 60 + 61 + required: 62 + - compatible 63 + - reg 64 + 65 + unevaluatedProperties: false 66 + 67 + examples: 68 + - | 69 + i2c { 70 + #address-cells = <1>; 71 + #size-cells = <0>; 72 + codec@21 { 73 + compatible = "nuvoton,nau8325"; 74 + reg = <0x21>; 75 + nuvoton,vref-impedance-ohms = <125000>; 76 + nuvoton,dac-vref-microvolt = <2880000>; 77 + nuvoton,alc-enable; 78 + nuvoton,clock-det-data; 79 + }; 80 + };