Documentation/devicetree/bindings/iio/adc/adi,ad7124.txt

   1 Analog Devices AD7124 ADC device driver
   2
   3 Required properties for the AD7124:
   4         - compatible: Must be one of "adi,ad7124-4" or "adi,ad7124-8"
   5         - reg: SPI chip select number for the device
   6         - spi-max-frequency: Max SPI frequency to use
   7                 see: Documentation/devicetree/bindings/spi/spi-bus.txt
   8         - clocks: phandle to the master clock (mclk)
   9                 see: Documentation/devicetree/bindings/clock/clock-bindings.txt
  10         - clock-names: Must be "mclk".
  11         - interrupts: IRQ line for the ADC
  12                 see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
  13
  14           Required properties:
  15                 * #address-cells: Must be 1.
  16                 * #size-cells: Must be 0.
  17
  18           Subnode(s) represent the external channels which are connected to the ADC.
  19           Each subnode represents one channel and has the following properties:
  20                 Required properties:
  21                         * reg: The channel number. It can have up to 4 channels on ad7124-4
  22                           and 8 channels on ad7124-8, numbered from 0 to 15.
  23                         * diff-channels: see: Documentation/devicetree/bindings/iio/adc/adc.txt
  24
  25                 Optional properties:
  26                         * bipolar: see: Documentation/devicetree/bindings/iio/adc/adc.txt
  27                         * adi,reference-select: Select the reference source to use when
  28                           converting on the the specific channel. Valid values are:
  29                           0: REFIN1(+)/REFIN1(−).
  30                           1: REFIN2(+)/REFIN2(−).
  31                           3: AVDD
  32                           If this field is left empty, internal reference is selected.
  33
  34 Optional properties:
  35         - refin1-supply: refin1 supply can be used as reference for conversion.
  36         - refin2-supply: refin2 supply can be used as reference for conversion.
  37         - avdd-supply: avdd supply can be used as reference for conversion.
  38
  39 Example:
  40         adc@0 {
  41                 compatible = "adi,ad7124-4";
  42                 reg = <0>;
  43                 spi-max-frequency = <5000000>;
  44                 interrupts = <25 2>;
  45                 interrupt-parent = <&gpio>;
  46                 refin1-supply = <&adc_vref>;
  47                 clocks = <&ad7124_mclk>;
  48                 clock-names = "mclk";
  49
  50                 #address-cells = <1>;
  51                 #size-cells = <0>;
  52
  53                 channel@0 {
  54                         reg = <0>;
  55                         diff-channels = <0 1>;
  56                         adi,reference-select = <0>;
  57                 };
  58
  59                 channel@1 {
  60                         reg = <1>;
  61                         bipolar;
  62                         diff-channels = <2 3>;
  63                         adi,reference-select = <0>;
  64                 };
  65
  66                 channel@2 {
  67                         reg = <2>;
  68                         diff-channels = <4 5>;
  69                 };
  70
  71                 channel@3 {
  72                         reg = <3>;
  73                         diff-channels = <6 7>;
  74                 };
  75         };