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-Nuvoton NAU8824 audio codec
-
-This device supports I2C only.
-
-Required properties:
-  - compatible : Must be "nuvoton,nau8824"
-
-  - reg : the I2C address of the device. This is either 0x1a (CSB=0) or 0x1b (CSB=1).
-
-Optional properties:
-  - 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,sar-threshold-num: Number of buttons supported
-  - nuvoton,sar-threshold: Impedance threshold for each button. Array that contains up to 8 buttons configuration. SAR value is calculated as
-    SAR = 255 * MICBIAS / SAR_VOLTAGE * R / (2000 + R)
-    where MICBIAS is configured by 'nuvoton,micbias-voltage', SAR_VOLTAGE is configured by 'nuvoton,sar-voltage', R - button impedance.
-    Refer datasheet section 10.2 for more information about threshold calculation.
-
-  - nuvoton,sar-hysteresis: Button impedance measurement hysteresis.
-
-  - nuvoton,sar-voltage: Reference voltage for button impedance measurement.
-      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,sar-compare-time: SAR compare time
-      0 - 500 ns
-      1 - 1 us
-      2 - 2 us
-      3 - 4 us
-
-  - nuvoton,sar-sampling-time: SAR sampling time
-      0 - 2 us
-      1 - 4 us
-      2 - 8 us
-      3 - 16 us
-
-  - nuvoton,short-key-debounce: Button short key press debounce time.
-      0 - 30 ms
-      1 - 50 ms
-      2 - 100 ms
-
-  - nuvoton,jack-eject-debounce: Jack ejection debounce time.
-      0 - 0 ms
-      1 - 1 ms
-      2 - 10 ms
-
-
-Example:
-
-  headset: nau8824@1a {
-      compatible = "nuvoton,nau8824";
-      reg = <0x1a>;
-      interrupt-parent = <&gpio>;
-      interrupts = <TEGRA_GPIO(E, 6) IRQ_TYPE_LEVEL_LOW>;
-      nuvoton,vref-impedance = <2>;
-      nuvoton,micbias-voltage = <6>;
-      // Setup 4 buttons impedance according to Android specification
-      nuvoton,sar-threshold-num = <4>;
-      nuvoton,sar-threshold = <0xc 0x1e 0x38 0x60>;
-      nuvoton,sar-hysteresis = <0>;
-      nuvoton,sar-voltage = <6>;
-      nuvoton,sar-compare-time = <1>;
-      nuvoton,sar-sampling-time = <1>;
-      nuvoton,short-key-debounce = <0>;
-      nuvoton,jack-eject-debounce = <1>;
-  };