cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nau8824.txt (2535B)

      1Nuvoton NAU8824 audio codec
      2
      3This device supports I2C only.
      4
      5Required properties:
      6  - compatible : Must be "nuvoton,nau8824"
      7
      8  - reg : the I2C address of the device. This is either 0x1a (CSB=0) or 0x1b (CSB=1).
      9
     10Optional properties:
     11  - nuvoton,jkdet-polarity: JKDET pin polarity. 0 - active high, 1 - active low.
     12
     13  - nuvoton,vref-impedance: VREF Impedance selection
     14      0 - Open
     15      1 - 25 kOhm
     16      2 - 125 kOhm
     17      3 - 2.5 kOhm
     18
     19  - nuvoton,micbias-voltage: Micbias voltage level.
     20      0 - VDDA
     21      1 - VDDA
     22      2 - VDDA * 1.1
     23      3 - VDDA * 1.2
     24      4 - VDDA * 1.3
     25      5 - VDDA * 1.4
     26      6 - VDDA * 1.53
     27      7 - VDDA * 1.53
     28
     29  - nuvoton,sar-threshold-num: Number of buttons supported
     30  - nuvoton,sar-threshold: Impedance threshold for each button. Array that contains up to 8 buttons configuration. SAR value is calculated as
     31    SAR = 255 * MICBIAS / SAR_VOLTAGE * R / (2000 + R)
     32    where MICBIAS is configured by 'nuvoton,micbias-voltage', SAR_VOLTAGE is configured by 'nuvoton,sar-voltage', R - button impedance.
     33    Refer datasheet section 10.2 for more information about threshold calculation.
     34
     35  - nuvoton,sar-hysteresis: Button impedance measurement hysteresis.
     36
     37  - nuvoton,sar-voltage: Reference voltage for button impedance measurement.
     38      0 - VDDA
     39      1 - VDDA
     40      2 - VDDA * 1.1
     41      3 - VDDA * 1.2
     42      4 - VDDA * 1.3
     43      5 - VDDA * 1.4
     44      6 - VDDA * 1.53
     45      7 - VDDA * 1.53
     46
     47  - nuvoton,sar-compare-time: SAR compare time
     48      0 - 500 ns
     49      1 - 1 us
     50      2 - 2 us
     51      3 - 4 us
     52
     53  - nuvoton,sar-sampling-time: SAR sampling time
     54      0 - 2 us
     55      1 - 4 us
     56      2 - 8 us
     57      3 - 16 us
     58
     59  - nuvoton,short-key-debounce: Button short key press debounce time.
     60      0 - 30 ms
     61      1 - 50 ms
     62      2 - 100 ms
     63
     64  - nuvoton,jack-eject-debounce: Jack ejection debounce time.
     65      0 - 0 ms
     66      1 - 1 ms
     67      2 - 10 ms
     68
     69
     70Example:
     71
     72  headset: nau8824@1a {
     73      compatible = "nuvoton,nau8824";
     74      reg = <0x1a>;
     75      interrupt-parent = <&gpio>;
     76      interrupts = <TEGRA_GPIO(E, 6) IRQ_TYPE_LEVEL_LOW>;
     77      nuvoton,vref-impedance = <2>;
     78      nuvoton,micbias-voltage = <6>;
     79      // Setup 4 buttons impedance according to Android specification
     80      nuvoton,sar-threshold-num = <4>;
     81      nuvoton,sar-threshold = <0xc 0x1e 0x38 0x60>;
     82      nuvoton,sar-hysteresis = <0>;
     83      nuvoton,sar-voltage = <6>;
     84      nuvoton,sar-compare-time = <1>;
     85      nuvoton,sar-sampling-time = <1>;
     86      nuvoton,short-key-debounce = <0>;
     87      nuvoton,jack-eject-debounce = <1>;
     88  };