The ADAU1977 is a four channel audio ADC. It can either be connected to an I2C or a SPI bus. Both bindings are described in this document. Other than the standard I2C and SPI bus properties a regulator for the AVDD supply needs to be specified in the bindings. Optionally, if present in the hardware design, a regulator for the DVDD supply and a GPIO connected to the chips reset pin can be specified. The bindings also allow to specify the microphone bias voltage that should be used with the hardware design.
Cc: Rob Herring robh+dt@kernel.org Cc: Pawel Moll pawel.moll@arm.com Cc: Mark Rutland mark.rutland@arm.com Cc: Ian Campbell ijc+devicetree@hellion.org.uk Cc: Kumar Gala galak@codeaurora.org Cc: devicetree@vger.kernel.org Signed-off-by: Lars-Peter Clausen lars@metafoo.de --- .../devicetree/bindings/sound/adi,adau1977.txt | 58 ++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/adi,adau1977.txt
diff --git a/Documentation/devicetree/bindings/sound/adi,adau1977.txt b/Documentation/devicetree/bindings/sound/adi,adau1977.txt new file mode 100644 index 0000000..3cf03d8 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/adi,adau1977.txt @@ -0,0 +1,58 @@ +Analog Devices ADAU1977, ADAU1978, ADAU1979 devicetree bindings + +The ADAU1977 is a four channel audio ADC. It can either be connected to an I2C +or a SPI bus. Both bindings are described in this document. Depending on the bus +type different properties must/can be specified. + +Shared required properties: + - compatible: Must be "adi,adau1977", "adi,adau1978" or adi,adau1979" + - AVDD-supply: A handle to the power supply connected to the AVDD pin + +Shared optional properties: + - DVDD-supply: A handle to the power supply connected to the DVDD pin. If + specified the internal LDO will be disabled. + - reset-gpios: GPIO chip handle and specifier that define which GPIO is + connected to the chips PD/RST pin. If not specified the reset pin is assumed + to be hardwired to VCC. + - adi,micbias: Configures the voltage setting for the MICBIAS pin. If not + specified the default value will be 8.5 Volts. This property is only valid + for the ADAU1977. + Valid values for this property are: + 0: 5.0V + 1: 5.5V + 2: 6.0V + 3: 6.5V + 4: 7.0V + 5: 7.5V + 6: 8.0V + 7: 8.5V + 8: 9.0V + +I2C required properties: + - reg: The I2C address of the chip + +SPI required properties: + - reg: The SPI chipselect signal of the SPI master associated with this chip + - spi-max-frequency: Maximum spi frequency to use. + +Examples: + +&i2c_bus { + adau1977: codec@11 { + compatible = "adi,adau1977"; + reg = <0x11>; + reset-gpios = <&gpio 5 0>; + AVDD-supply = <&codec_avdd_supply>; + DVDD-supply = <&codec_dvdd_supply>; + }; +}; + +&spi_bus { + adau1977: codec@1 { + compatible = "adi,adau1977"; + reg = <0x1>; + spi-max-frequency = <10000000>; + AVDD-supply = <&codec_avdd_supply>; + adi,micbias = <5>; + }; +};