Commit | Line | Data |
---|---|---|
34ca27f3 AP |
1 | Nuvoton NAU8825 audio codec |
2 | ||
3 | This device supports I2C only. | |
4 | ||
5 | Required properties: | |
6 | - compatible : Must be "nuvoton,nau8825" | |
7 | ||
8 | - reg : the I2C address of the device. This is either 0x1a (CSB=0) or 0x1b (CSB=1). | |
9 | ||
10 | Optional properties: | |
11 | - nuvoton,jkdet-enable: Enable jack detection via JKDET pin. | |
12 | - nuvoton,jkdet-pull-enable: Enable JKDET pin pull. If set - pin pull enabled, | |
13 | otherwise pin in high impedance state. | |
14 | - nuvoton,jkdet-pull-up: Pull-up JKDET pin. If set then JKDET pin is pull up, otherwise pull down. | |
15 | - nuvoton,jkdet-polarity: JKDET pin polarity. 0 - active high, 1 - active low. | |
16 | ||
17 | - nuvoton,vref-impedance: VREF Impedance selection | |
18 | 0 - Open | |
19 | 1 - 25 kOhm | |
20 | 2 - 125 kOhm | |
21 | 3 - 2.5 kOhm | |
22 | ||
23 | - nuvoton,micbias-voltage: Micbias voltage level. | |
24 | 0 - VDDA | |
25 | 1 - VDDA | |
26 | 2 - VDDA * 1.1 | |
27 | 3 - VDDA * 1.2 | |
28 | 4 - VDDA * 1.3 | |
29 | 5 - VDDA * 1.4 | |
30 | 6 - VDDA * 1.53 | |
31 | 7 - VDDA * 1.53 | |
32 | ||
33 | - nuvoton,sar-threshold-num: Number of buttons supported | |
34 | - nuvoton,sar-threshold: Impedance threshold for each button. Array that contains up to 8 buttons configuration. SAR value is calculated as | |
35 | SAR = 255 * MICBIAS / SAR_VOLTAGE * R / (2000 + R) | |
36 | where MICBIAS is configured by 'nuvoton,micbias-voltage', SAR_VOLTAGE is configured by 'nuvoton,sar-voltage', R - button impedance. | |
37 | Refer datasheet section 10.2 for more information about threshold calculation. | |
38 | ||
39 | - nuvoton,sar-hysteresis: Button impedance measurement hysteresis. | |
40 | ||
41 | - nuvoton,sar-voltage: Reference voltage for button impedance measurement. | |
42 | 0 - VDDA | |
43 | 1 - VDDA | |
44 | 2 - VDDA * 1.1 | |
45 | 3 - VDDA * 1.2 | |
46 | 4 - VDDA * 1.3 | |
47 | 5 - VDDA * 1.4 | |
48 | 6 - VDDA * 1.53 | |
49 | 7 - VDDA * 1.53 | |
50 | ||
51 | - nuvoton,sar-compare-time: SAR compare time | |
52 | 0 - 500 ns | |
53 | 1 - 1 us | |
54 | 2 - 2 us | |
55 | 3 - 4 us | |
56 | ||
57 | - nuvoton,sar-sampling-time: SAR sampling time | |
58 | 0 - 2 us | |
59 | 1 - 4 us | |
60 | 2 - 8 us | |
61 | 3 - 16 us | |
62 | ||
63 | - nuvoton,short-key-debounce: Button short key press debounce time. | |
64 | 0 - 30 ms | |
65 | 1 - 50 ms | |
66 | 2 - 100 ms | |
67 | 3 - 30 ms | |
68 | ||
69 | - nuvoton,jack-insert-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms | |
70 | - nuvoton,jack-eject-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms | |
71 | ||
72 | - clocks: list of phandle and clock specifier pairs according to common clock bindings for the | |
73 | clocks described in clock-names | |
74 | - clock-names: should include "mclk" for the MCLK master clock | |
75 | ||
76 | Example: | |
77 | ||
78 | headset: nau8825@1a { | |
79 | compatible = "nuvoton,nau8825"; | |
80 | reg = <0x1a>; | |
81 | interrupt-parent = <&gpio>; | |
82 | interrupts = <TEGRA_GPIO(E, 6) IRQ_TYPE_LEVEL_LOW>; | |
83 | nuvoton,jkdet-enable; | |
84 | nuvoton,jkdet-pull-enable; | |
85 | nuvoton,jkdet-pull-up; | |
86 | nuvoton,jkdet-polarity = <GPIO_ACTIVE_LOW>; | |
87 | nuvoton,vref-impedance = <2>; | |
88 | nuvoton,micbias-voltage = <6>; | |
89 | // Setup 4 buttons impedance according to Android specification | |
90 | nuvoton,sar-threshold-num = <4>; | |
91 | nuvoton,sar-threshold = <0xc 0x1e 0x38 0x60>; | |
92 | nuvoton,sar-hysteresis = <1>; | |
93 | nuvoton,sar-voltage = <0>; | |
94 | nuvoton,sar-compare-time = <0>; | |
95 | nuvoton,sar-sampling-time = <0>; | |
96 | nuvoton,short-key-debounce = <2>; | |
97 | nuvoton,jack-insert-debounce = <7>; | |
98 | nuvoton,jack-eject-debounce = <7>; | |
99 | ||
100 | clock-names = "mclk"; | |
101 | clocks = <&tegra_car TEGRA210_CLK_CLK_OUT_2>; | |
102 | }; |