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