109 lines
3.5 KiB
Plaintext
109 lines
3.5 KiB
Plaintext
Nuvoton NAU8825 audio codec
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This device supports I2C only.
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Required properties:
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- compatible : Must be "nuvoton,nau8825"
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- reg : the I2C address of the device. This is either 0x1a (CSB=0) or 0x1b (CSB=1).
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Optional properties:
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- nuvoton,jkdet-enable: Enable jack detection via JKDET pin.
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- nuvoton,jkdet-pull-enable: Enable JKDET pin pull. If set - pin pull enabled,
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otherwise pin in high impedance state.
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- nuvoton,jkdet-pull-up: Pull-up JKDET pin. If set then JKDET pin is pull up, otherwise pull down.
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- nuvoton,jkdet-polarity: JKDET pin polarity. 0 - active high, 1 - active low.
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- nuvoton,vref-impedance: VREF Impedance selection
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0 - Open
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1 - 25 kOhm
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2 - 125 kOhm
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3 - 2.5 kOhm
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- nuvoton,micbias-voltage: Micbias voltage level.
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0 - VDDA
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1 - VDDA
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2 - VDDA * 1.1
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3 - VDDA * 1.2
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4 - VDDA * 1.3
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5 - VDDA * 1.4
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6 - VDDA * 1.53
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7 - VDDA * 1.53
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- nuvoton,sar-threshold-num: Number of buttons supported
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- nuvoton,sar-threshold: Impedance threshold for each button. Array that contains up to 8 buttons configuration. SAR value is calculated as
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SAR = 255 * MICBIAS / SAR_VOLTAGE * R / (2000 + R)
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where MICBIAS is configured by 'nuvoton,micbias-voltage', SAR_VOLTAGE is configured by 'nuvoton,sar-voltage', R - button impedance.
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Refer datasheet section 10.2 for more information about threshold calculation.
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- nuvoton,sar-hysteresis: Button impedance measurement hysteresis.
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- nuvoton,sar-voltage: Reference voltage for button impedance measurement.
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0 - VDDA
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1 - VDDA
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2 - VDDA * 1.1
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3 - VDDA * 1.2
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4 - VDDA * 1.3
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5 - VDDA * 1.4
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6 - VDDA * 1.53
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7 - VDDA * 1.53
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- nuvoton,sar-compare-time: SAR compare time
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0 - 500 ns
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1 - 1 us
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2 - 2 us
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3 - 4 us
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- nuvoton,sar-sampling-time: SAR sampling time
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0 - 2 us
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1 - 4 us
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2 - 8 us
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3 - 16 us
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- nuvoton,short-key-debounce: Button short key press debounce time.
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0 - 30 ms
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1 - 50 ms
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2 - 100 ms
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3 - 30 ms
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- nuvoton,jack-insert-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms
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- nuvoton,jack-eject-debounce: number from 0 to 7 that sets debounce time to 2^(n+2) ms
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- nuvoton,crosstalk-enable: make crosstalk function enable if set.
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- nuvoton,adcout-drive-strong: make the drive strength of ADCOUT IO PIN strong if set.
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Otherwise, the drive keeps normal strength.
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- clocks: list of phandle and clock specifier pairs according to common clock bindings for the
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clocks described in clock-names
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- clock-names: should include "mclk" for the MCLK master clock
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Example:
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headset: nau8825@1a {
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compatible = "nuvoton,nau8825";
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reg = <0x1a>;
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interrupt-parent = <&gpio>;
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interrupts = <TEGRA_GPIO(E, 6) IRQ_TYPE_LEVEL_LOW>;
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nuvoton,jkdet-enable;
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nuvoton,jkdet-pull-enable;
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nuvoton,jkdet-pull-up;
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nuvoton,jkdet-polarity = <GPIO_ACTIVE_LOW>;
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nuvoton,vref-impedance = <2>;
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nuvoton,micbias-voltage = <6>;
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// Setup 4 buttons impedance according to Android specification
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nuvoton,sar-threshold-num = <4>;
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nuvoton,sar-threshold = <0xc 0x1e 0x38 0x60>;
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nuvoton,sar-hysteresis = <1>;
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nuvoton,sar-voltage = <0>;
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nuvoton,sar-compare-time = <0>;
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nuvoton,sar-sampling-time = <0>;
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nuvoton,short-key-debounce = <2>;
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nuvoton,jack-insert-debounce = <7>;
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nuvoton,jack-eject-debounce = <7>;
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nuvoton,crosstalk-enable;
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clock-names = "mclk";
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clocks = <&tegra_pmc TEGRA_PMC_CLK_OUT_2>;
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};
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