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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/sound/nuvoton,nau8325.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: NAU8325 audio Amplifier8 9maintainers:10 - Seven Lee <WTLI@nuvoton.com>11 12allOf:13 - $ref: dai-common.yaml#14 15properties:16 compatible:17 const: nuvoton,nau832518 19 reg:20 maxItems: 121 22 nuvoton,vref-impedance-ohms:23 description:24 The vref impedance to be used in ohms. Middle of voltage enables25 Tie-Off selection options. Due to the high impedance of the VREF26 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. Can33 be used for minor tuning of the output level. Since the VDDA is range34 between 1.62 to 1.98 voltage, the typical value for design is 1.8V. After35 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: boolean43 44 nuvoton,clock-detection-disable:45 description:46 When clock detection is enabled, it will detect whether MCLK47 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 ratio49 MCLK_SRC/LRCK of 256, 400 or 500, and needs to detect the BCLK50 to make sure data is present. There needs to be at least 8 BCLK51 cycles per Frame Sync.52 type: boolean53 54 nuvoton,clock-det-data:55 description:56 Request clock detection to require 2048 non-zero samples before enabling57 the audio paths. If set then non-zero samples is required, otherwise it58 doesn't matter.59 type: boolean60 61required:62 - compatible63 - reg64 65unevaluatedProperties: false66 67examples: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 };81