76 lines
2.2 KiB
Plaintext
76 lines
2.2 KiB
Plaintext
|
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>;
|
|||
|
|
};
|
|||
|
|
};
|