nau8825.txt

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    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   - nuvoton,crosstalk-enable: make crosstalk function enable if set.
   73 
   74   - clocks: list of phandle and clock specifier pairs according to common clock bindings for the
   75       clocks described in clock-names
   76   - clock-names: should include "mclk" for the MCLK master clock
   77 
   78 Example:
   79 
   80   headset: nau8825@1a {
   81       compatible = "nuvoton,nau8825";
   82       reg = <0x1a>;
   83       interrupt-parent = <&gpio>;
   84       interrupts = <TEGRA_GPIO(E, 6) IRQ_TYPE_LEVEL_LOW>;
   85       nuvoton,jkdet-enable;
   86       nuvoton,jkdet-pull-enable;
   87       nuvoton,jkdet-pull-up;
   88       nuvoton,jkdet-polarity = <GPIO_ACTIVE_LOW>;
   89       nuvoton,vref-impedance = <2>;
   90       nuvoton,micbias-voltage = <6>;
   91       // Setup 4 buttons impedance according to Android specification
   92       nuvoton,sar-threshold-num = <4>;
   93       nuvoton,sar-threshold = <0xc 0x1e 0x38 0x60>;
   94       nuvoton,sar-hysteresis = <1>;
   95       nuvoton,sar-voltage = <0>;
   96       nuvoton,sar-compare-time = <0>;
   97       nuvoton,sar-sampling-time = <0>;
   98       nuvoton,short-key-debounce = <2>;
   99       nuvoton,jack-insert-debounce = <7>;
  100       nuvoton,jack-eject-debounce = <7>;
  101       nuvoton,crosstalk-enable;
  102 
  103       clock-names = "mclk";
  104       clocks = <&tegra_pmc TEGRA_PMC_CLK_OUT_2>;
  105   };

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