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Analog Devices AD7124 ADC device driver
Required properties for the AD7124:
- compatible: Must be one of "adi,ad7124-4" or "adi,ad7124-8"
- reg: SPI chip select number for the device
- spi-max-frequency: Max SPI frequency to use
see: Documentation/devicetree/bindings/spi/spi-bus.txt
- clocks: phandle to the master clock (mclk)
see: Documentation/devicetree/bindings/clock/clock-bindings.txt
- clock-names: Must be "mclk".
- interrupts: IRQ line for the ADC
see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
Required properties:
* #address-cells: Must be 1.
* #size-cells: Must be 0.
Subnode(s) represent the external channels which are connected to the ADC.
Each subnode represents one channel and has the following properties:
Required properties:
* reg: The channel number. It can have up to 4 channels on ad7124-4
and 8 channels on ad7124-8, numbered from 0 to 15.
* diff-channels: see: Documentation/devicetree/bindings/iio/adc/adc.txt
Optional properties:
* bipolar: see: Documentation/devicetree/bindings/iio/adc/adc.txt
* adi,reference-select: Select the reference source to use when
converting on the the specific channel. Valid values are:
0: REFIN1(+)/REFIN1(−).
1: REFIN2(+)/REFIN2(−).
3: AVDD
If this field is left empty, internal reference is selected.
Optional properties:
- refin1-supply: refin1 supply can be used as reference for conversion.
- refin2-supply: refin2 supply can be used as reference for conversion.
- avdd-supply: avdd supply can be used as reference for conversion.
Example:
adc@0 {
compatible = "adi,ad7124-4";
reg = <0>;
spi-max-frequency = <5000000>;
interrupts = <25 2>;
interrupt-parent = <&gpio>;
refin1-supply = <&adc_vref>;
clocks = <&ad7124_mclk>;
clock-names = "mclk";
#address-cells = <1>;
#size-cells = <0>;
channel@0 {
reg = <0>;
diff-channels = <0 1>;
adi,reference-select = <0>;
};
channel@1 {
reg = <1>;
bipolar;
diff-channels = <2 3>;
adi,reference-select = <0>;
};
channel@2 {
reg = <2>;
diff-channels = <4 5>;
};
channel@3 {
reg = <3>;
diff-channels = <6 7>;
};
};
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