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ASoC: dt-bindings: add dt bindings for adau1977 audio codec 

Add device-tree bindings documentation file for ADAU1977 audio codec.
This describes device-tree fields that are already supported by the driver.

The driver supports both I2C AND and SPI, and this doc covers both aspects
of the DT configuration.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Alexandru Ardelean 2018-10-02 15:06:30 +03:00 committed by Mark Brown
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commit d5a5dcd3f8
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Documentation/devicetree/bindings/sound/adi,adau1977.txt Normal file
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Analog Devices ADAU1977/ADAU1978/ADAU1979
Datasheets:
http://www.analog.com/media/en/technical-documentation/data-sheets/ADAU1977.pdf
http://www.analog.com/media/en/technical-documentation/data-sheets/ADAU1978.pdf
http://www.analog.com/media/en/technical-documentation/data-sheets/ADAU1979.pdf
This driver supports both the I2C and SPI bus.
Required properties:
- compatible: Should contain one of the following:
"adi,adau1977"
"adi,adau1978"
"adi,adau1979"
- AVDD-supply: analog power supply for the device, please consult
Documentation/devicetree/bindings/regulator/regulator.txt
Optional properties:
- reset-gpio: the reset pin for the chip, for more details consult
Documentation/devicetree/bindings/gpio/gpio.txt
- DVDD-supply: supply voltage for the digital core, please consult
Documentation/devicetree/bindings/regulator/regulator.txt
For required properties on SPI, please consult
Documentation/devicetree/bindings/spi/spi-bus.txt
Required properties on I2C:
- reg: The i2c address. Value depends on the state of ADDR0
and ADDR1, as wired in hardware.
Examples:
adau1977_spi: adau1977@0 {
compatible = "adi,adau1977";
spi-max-frequency = <600000>;
AVDD-supply = <&regulator>;
DVDD-supply = <&regulator_digital>;
reset_gpio = <&gpio 10 GPIO_ACTIVE_LOW>;
};
adau1977_i2c: adau1977@11 {
compatible = "adi,adau1977";
reg = <0x11>;
AVDD-supply = <&regulator>;
DVDD-supply = <&regulator_digital>;
reset_gpio = <&gpio 10 GPIO_ACTIVE_LOW>;
};