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* Analog Devices 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>;
};
};
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