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 };
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