nau8821.txt

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    1 Nuvoton NAU88L21 audio codec
    2 
    3 This device supports I2C only.
    4 
    5 Required properties:
    6   - compatible : Must be "nuvoton,nau8821"
    7 
    8   - reg : the I2C address of the device. This is either 0x1B (CSB=0) or 0x54 (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,jack-insert-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms
   34   - nuvoton,jack-eject-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms
   35 
   36   - nuvoton,dmic-clk-threshold: the ADC threshold of DMIC clock.
   37   - nuvoton,key_enable: Headset button detection switch.
   38 
   39 Example:
   40 
   41   headset: nau8821@1b {
   42       compatible = "nuvoton,nau8821";
   43       reg = <0x1b>;
   44       interrupt-parent = <&gpio>;
   45       interrupts = <23 IRQ_TYPE_LEVEL_LOW>;
   46       nuvoton,jkdet-enable;
   47       nuvoton,jkdet-pull-enable;
   48       nuvoton,jkdet-pull-up;
   49       nuvoton,jkdet-polarity = <GPIO_ACTIVE_LOW>;
   50       nuvoton,vref-impedance = <2>;
   51       nuvoton,micbias-voltage = <6>;
   52       nuvoton,jack-insert-debounce = <7>;
   53       nuvoton,jack-eject-debounce = <7>;
   54       nuvoton,dmic-clk-threshold = 3072000;
   55   };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/sound/nau8821.txt

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sys/contrib/device-tree/Bindings/sound/nau8821.txt