* Analog Device AD5755 IIO Multi-Channel DAC Linux Driver
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Required properties:
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- compatible: Has to contain one of the following:
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adi,ad5755
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adi,ad5755-1
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adi,ad5757
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adi,ad5735
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adi,ad5737
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- reg: spi chip select number for the device
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- spi-cpha or spi-cpol: is the only modes that is supported
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Recommended properties:
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- spi-max-frequency: Definition as per
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Documentation/devicetree/bindings/spi/spi-bus.txt
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Optional properties:
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See include/dt-bindings/iio/ad5755.h
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- adi,ext-dc-dc-compenstation-resistor: boolean set if the hardware have an
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external resistor and thereby bypasses
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the internal compensation resistor.
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- adi,dc-dc-phase:
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Valid values for DC DC Phase control is:
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0: All dc-to-dc converters clock on the same edge.
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1: Channel A and Channel B clock on the same edge,
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Channel C and Channel D clock on opposite edges.
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2: Channel A and Channel C clock on the same edge,
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Channel B and Channel D clock on opposite edges.
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3: Channel A, Channel B, Channel C, and Channel D
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clock 90 degrees out of phase from each other.
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- adi,dc-dc-freq-hz:
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Valid values for DC DC frequency is [Hz]:
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250000
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410000
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650000
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- adi,dc-dc-max-microvolt:
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Valid values for the maximum allowed Vboost voltage supplied by
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the dc-to-dc converter is:
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23000000
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24500000
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27000000
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29500000
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Optional for every channel:
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- adi,mode:
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Valid values for DAC modes is:
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0: 0 V to 5 V voltage range.
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1: 0 V to 10 V voltage range.
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2: Plus minus 5 V voltage range.
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3: Plus minus 10 V voltage range.
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4: 4 mA to 20 mA current range.
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5: 0 mA to 20 mA current range.
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6: 0 mA to 24 mA current range.
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- adi,ext-current-sense-resistor: boolean set if the hardware a external
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current sense resistor.
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- adi,enable-voltage-overrange: boolean enable voltage overrange
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- adi,slew: Array of slewrate settings should contain 3 fields:
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1: Should be either 0 or 1 in order to enable or disable slewrate.
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2: Slew rate settings:
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Valid values for the slew rate update frequency:
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64000
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32000
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16000
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8000
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4000
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2000
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1000
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500
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250
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125
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64
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32
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16
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8
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4
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0
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3: Slew step size:
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Valid values for the step size LSBs:
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1
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2
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4
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16
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32
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64
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128
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256
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Example:
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dac@0 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "adi,ad5755";
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reg = <0>;
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spi-max-frequency = <1000000>;
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spi-cpha;
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adi,dc-dc-phase = <0>;
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adi,dc-dc-freq-hz = <410000>;
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adi,dc-dc-max-microvolt = <23000000>;
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channel@0 {
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reg = <0>;
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adi,mode = <4>;
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adi,ext-current-sense-resistor;
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adi,slew = <0 64000 1>;
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};
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channel@1 {
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reg = <1>;
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adi,mode = <4>;
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adi,ext-current-sense-resistor;
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adi,slew = <0 64000 1>;
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};
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channel@2 {
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reg = <2>;
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adi,mode = <4>;
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adi,ext-current-sense-resistor;
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adi,slew = <0 64000 1>;
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};
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channel@3 {
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reg = <3>;
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adi,mode = <4>;
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adi,ext-current-sense-resistor;
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adi,slew = <0 64000 1>;
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};
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};
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