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+Nuvoton NAU88L21 audio codec
+
+This device supports I2C only.
+
+Required properties:
+ - compatible : Must be "nuvoton,nau8821"
+
+ - reg : the I2C address of the device. This is either 0x1B (CSB=0) or 0x54 (CSB=1).
+
+Optional properties:
+ - nuvoton,jkdet-enable: Enable jack detection via JKDET pin.
+ - nuvoton,jkdet-pull-enable: Enable JKDET pin pull. If set - pin pull enabled,
+ otherwise pin in high impedance state.
+ - nuvoton,jkdet-pull-up: Pull-up JKDET pin. If set then JKDET pin is pull up, otherwise pull down.
+ - nuvoton,jkdet-polarity: JKDET pin polarity. 0 - active high, 1 - active low.
+
+ - nuvoton,vref-impedance: VREF Impedance selection
+ 0 - Open
+ 1 - 25 kOhm
+ 2 - 125 kOhm
+ 3 - 2.5 kOhm
+
+ - nuvoton,micbias-voltage: Micbias voltage level.
+ 0 - VDDA
+ 1 - VDDA
+ 2 - VDDA * 1.1
+ 3 - VDDA * 1.2
+ 4 - VDDA * 1.3
+ 5 - VDDA * 1.4
+ 6 - VDDA * 1.53
+ 7 - VDDA * 1.53
+
+ - nuvoton,jack-insert-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms
+ - nuvoton,jack-eject-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms
+
+ - nuvoton,dmic-clk-threshold: the ADC threshold of DMIC clock.
+ - nuvoton,key_enable: Headset button detection switch.
+
+Example:
+
+ headset: nau8821@1b {
+ compatible = "nuvoton,nau8821";
+ reg = <0x1b>;
+ interrupt-parent = <&gpio>;
+ interrupts = <23 IRQ_TYPE_LEVEL_LOW>;
+ nuvoton,jkdet-enable;
+ nuvoton,jkdet-pull-enable;
+ nuvoton,jkdet-pull-up;
+ nuvoton,jkdet-polarity = <GPIO_ACTIVE_LOW>;
+ nuvoton,vref-impedance = <2>;
+ nuvoton,micbias-voltage = <6>;
+ nuvoton,jack-insert-debounce = <7>;
+ nuvoton,jack-eject-debounce = <7>;
+ nuvoton,dmic-clk-threshold = 3072000;
+ };