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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/sound/nuvoton,nau8824.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: NAU8824 audio CODEC
maintainers:
- John Hsu <KCHSU0@nuvoton.com>
allOf:
- $ref: dai-common.yaml#
properties:
compatible:
enum:
- nuvoton,nau8824
reg:
maxItems: 1
'#sound-dai-cells':
const: 0
interrupts:
maxItems: 1
nuvoton,jkdet-polarity:
$ref: /schemas/types.yaml#/definitions/uint32
description:
JKDET pin polarity.
enum:
- 0 # active high
- 1 # active low
default: 1
nuvoton,vref-impedance:
$ref: /schemas/types.yaml#/definitions/uint32
description:
VREF Impedance selection.
enum:
- 0 # Open
- 1 # 25 kOhm
- 2 # 125 kOhm
- 3 # 2.5 kOhm
default: 2
nuvoton,micbias-voltage:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Micbias voltage level.
enum:
- 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
default: 6
nuvoton,sar-threshold-num:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Number of buttons supported.
minimum: 1
maximum: 8
default: 4
nuvoton,sar-threshold:
$ref: /schemas/types.yaml#/definitions/uint32-array
description:
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.
minItems: 1
maxItems: 8
items:
minimum: 0
maximum: 255
nuvoton,sar-hysteresis:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Button impedance measurement hysteresis.
default: 0
nuvoton,sar-voltage:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Reference voltage for button impedance measurement.
enum:
- 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
default: 6
nuvoton,sar-compare-time:
$ref: /schemas/types.yaml#/definitions/uint32
description:
SAR compare time.
enum:
- 0 # 500ns
- 1 # 1us
- 2 # 2us
- 3 # 4us
default: 1
nuvoton,sar-sampling-time:
$ref: /schemas/types.yaml#/definitions/uint32
description:
SAR sampling time.
enum:
- 0 # 2us
- 1 # 4us
- 2 # 8us
- 3 # 16us
default: 1
nuvoton,short-key-debounce:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Button short key press debounce time.
enum:
- 0 # 30 ms
- 1 # 50 ms
- 2 # 100 ms
default: 0
nuvoton,jack-eject-debounce:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Jack ejection debounce time.
enum:
- 0 # 0 ms
- 1 # 1 ms
- 2 # 10 ms
default: 1
required:
- compatible
- reg
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
codec@1a {
#sound-dai-cells = <0>;
compatible = "nuvoton,nau8824";
reg = <0x1a>;
interrupt-parent = <&gpio>;
interrupts = <38 IRQ_TYPE_LEVEL_LOW>;
nuvoton,vref-impedance = <2>;
nuvoton,micbias-voltage = <6>;
nuvoton,sar-threshold-num = <4>;
// Setup 4 buttons impedance according to Android specification
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>;
};
};
|
