nau8824.txt

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    1 Nuvoton NAU8824 audio codec
    2 
    3 This device supports I2C only.
    4 
    5 Required 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 
   10 Optional 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 
   70 Example:
   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   };

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