1Nuvoton NAU88L21 audio codec 2 3This device supports I2C only. 4 5Required 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 10Optional 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 39Example: 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 }; 56