Kernel-4.18.0-80.el8_ad5755

• Analog Device AD5755 IIO Multi-Channel DAC Linux Driver

Required properties:

• compatible: Has to contain one of the following:
  adi,ad5755
  adi,ad5755-1
  adi,ad5757
  adi,ad5735
  adi,ad5737

• reg: spi chip select number for the device

• spi-cpha or spi-cpol: is the only modes that is supported

Recommended properties:

• spi-max-frequency: Definition as per

   Documentation/devicetree/bindings/spi/spi-bus.txt
  

Optional properties:
See include/dt-bindings/iio/ad5755.h

• adi,ext-dc-dc-compenstation-resistor: boolean set if the hardware have an

                external resistor and thereby bypasses
                the internal compensation resistor.
  

• adi,dc-dc-phase:
  Valid values for DC DC Phase control is:
  0: All dc-to-dc converters clock on the same edge.
  1: Channel A and Channel B clock on the same edge,

  Channel C and Channel D clock on opposite edges.
  

  2: Channel A and Channel C clock on the same edge,

  Channel B and Channel D clock on opposite edges.
  

  3: Channel A, Channel B, Channel C, and Channel D

  clock 90 degrees out of phase from each other.
  

• adi,dc-dc-freq-hz:
  Valid values for DC DC frequency is [Hz]:
  250000
  410000
  650000
• adi,dc-dc-max-microvolt:
  Valid values for the maximum allowed Vboost voltage supplied by
  the dc-to-dc converter is:
  23000000
  24500000
  27000000
  29500000

Optional for every channel:

• adi,mode:
  Valid values for DAC modes is:
  0: 0 V to 5 V voltage range.
  1: 0 V to 10 V voltage range.
  2: Plus minus 5 V voltage range.
  3: Plus minus 10 V voltage range.
  4: 4 mA to 20 mA current range.
  5: 0 mA to 20 mA current range.
  6: 0 mA to 24 mA current range.
• adi,ext-current-sense-resistor: boolean set if the hardware a external

              current sense resistor.
  

• adi,enable-voltage-overrange: boolean enable voltage overrange
• adi,slew: Array of slewrate settings should contain 3 fields:
  1: Should be either 0 or 1 in order to enable or disable slewrate.
  2: Slew rate settings:

   Valid values for the slew rate update frequency:
   64000
   32000
   16000
   8000
   4000
   2000
   1000
   500
   250
   125
   64
   32
   16
   8
   4
   0
  

  3: Slew step size:

   Valid values for the step size LSBs:
   1
   2
   4
   16
   32
   64
   128
   256
  

Example:
dac@0 {
#address-cells = <1>;
#size-cells = <0>;
compatible = “adi,ad5755”;
reg = <0>;
spi-max-frequency = <1000000>;
spi-cpha;
adi,dc-dc-phase = <0>;
adi,dc-dc-freq-hz = <410000>;
adi,dc-dc-max-microvolt = <23000000>;
channel@0 {
reg = <0>;
adi,mode = <4>;
adi,ext-current-sense-resistor;
adi,slew = <0 64000 1>;
};
channel@1 {
reg = <1>;
adi,mode = <4>;
adi,ext-current-sense-resistor;
adi,slew = <0 64000 1>;
};
channel@2 {
reg = <2>;
adi,mode = <4>;
adi,ext-current-sense-resistor;
adi,slew = <0 64000 1>;
};
channel@3 {
reg = <3>;
adi,mode = <4>;
adi,ext-current-sense-resistor;
adi,slew = <0 64000 1>;
};
};