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# SPDX-License-Identifier: (GPL-
2.
0 OR BSD-
2-Clause)
# Copyright
2022 Analog Devices Inc.
%YAML
1.
2
---
$id:
http://devicetree.org/schemas/iio/adc/adi,ad4130.yaml#
$schema:
http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices AD4130 ADC device driver
maintainers:
- Cosmin Tanislav <cosmin.tanislav@analog.com>
description: |
Bindings for the Analog Devices AD4130 ADC. Datasheet can be found here:
https://www.analog.com/media/en/technical-documentation/data-sheets/AD4130-8.pdf
properties:
compatible:
enum:
- adi,ad4130
reg:
maxItems:
1
clocks:
maxItems:
1
description: phandle to the master clock (mclk)
clock-names:
items:
- const: mclk
interrupts:
maxItems:
1
interrupt-names:
description: |
Specify which interrupt pin should be configured as Data Ready / FIFO
interrupt.
Default if not supplied is int.
enum:
- int
- clk
- p2
- dout
'#address-cells':
const:
1
'#size-cells':
const:
0
'#clock-cells':
const:
0
clock-output-names:
maxItems:
1
refin1-supply:
description: refin1 supply. Can be used as reference for conversion.
refin2-supply:
description: refin2 supply. Can be used as reference for conversion.
avdd-supply:
description: AVDD voltage supply. Can be used as reference for conversion.
iovdd-supply:
description: IOVDD voltage supply. Used for the chip interface.
spi-max-frequency:
maximum:
5000000
adi,ext-clk-freq-hz:
description: Specify the frequency of the external clock.
enum: [
76800,
153600]
default:
76800
adi,bipolar:
description: Specify if the device should be used in bipolar mode.
type: boolean
adi,vbias-pins:
description: Analog inputs to apply a voltage bias of (AVDD − AVSS) /
2 to.
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems:
1
maxItems:
16
items:
minimum:
0
maximum:
15
required:
- compatible
- reg
- interrupts
patternProperties:
"^channel@([
0-
9a-f])$":
type: object
$ref: adc.yaml
unevaluatedProperties: false
properties:
reg:
description: The channel number.
minimum:
0
maximum:
15
diff-channels:
description: |
Besides the analog inputs available, internal inputs can be used.
16: Internal temperature sensor.
17: AVSS
18: Internal reference
19: DGND
20: (AVDD − AVSS)/
6+
21: (AVDD − AVSS)/
6-
22: (IOVDD − DGND)/
6+
23: (IOVDD − DGND)/
6-
24: (ALDO − AVSS)/
6+
25: (ALDO − AVSS)/
6-
26: (DLDO − DGND)/
6+
27: (DLDO − DGND)/
6-
28: V_MV_P
29: V_MV_M
items:
minimum:
0
maximum:
29
adi,reference-select:
description: |
Select the reference source to use when converting on the
specific channel. Valid values are:
0: REFIN1(+)/REFIN1(−)
1: REFIN2(+)/REFIN2(−)
2: REFOUT/AVSS (Internal reference)
3: AVDD/AVSS
If not specified, REFIN1 is used.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [
0,
1,
2,
3]
default:
0
adi,excitation-pin-
0:
description: |
Analog input to apply excitation current to while the channel
is active.
$ref: /schemas/types.yaml#/definitions/uint32
minimum:
0
maximum:
15
default:
0
adi,excitation-pin-
1:
description: |
Analog input to apply excitation current to while this channel
is active.
$ref: /schemas/types.yaml#/definitions/uint32
minimum:
0
maximum:
15
default:
0
adi,excitation-current-
0-nanoamp:
description: |
Excitation current in nanoamps to be applied to pin specified in
adi,excitation-pin-
0 while this channel is active.
enum: [
0,
100,
10000,
20000,
50000,
100000,
150000,
200000]
default:
0
adi,excitation-current-
1-nanoamp:
description: |
Excitation current in nanoamps to be applied to pin specified in
adi,excitation-pin-
1 while this channel is active.
enum: [
0,
100,
10000,
20000,
50000,
100000,
150000,
200000]
default:
0
adi,burnout-current-nanoamp:
description: |
Burnout current in nanoamps to be applied for this channel.
enum: [
0,
500,
2000,
4000]
default:
0
adi,buffered-positive:
description: Enable buffered mode for positive input.
type: boolean
adi,buffered-negative:
description: Enable buffered mode for negative input.
type: boolean
required:
- reg
- diff-channels
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
spi {
#address-cells = <
1>;
#size-cells = <
0>;
adc@
0 {
compatible = "adi,ad4130";
reg = <
0>;
#address-cells = <
1>;
#size-cells = <
0>;
spi-max-frequency = <
5000000>;
interrupts = <
27 IRQ_TYPE_EDGE_FALLING>;
interrupt-parent = <&gpio>;
channel@
0 {
reg = <
0>;
adi,reference-select = <
2>;
/* AIN8, AIN9 */
diff-channels = <
8 9>;
};
channel@
1 {
reg = <
1>;
adi,reference-select = <
2>;
/* AIN10, AIN11 */
diff-channels = <
10 11>;
};
channel@
2 {
reg = <
2>;
adi,reference-select = <
2>;
/* Temperature Sensor, DGND */
diff-channels = <
16 19>;
};
channel@
3 {
reg = <
3>;
adi,reference-select = <
2>;
/* Internal reference, DGND */
diff-channels = <
18 19>;
};
channel@
4 {
reg = <
4>;
adi,reference-select = <
2>;
/* DGND, DGND */
diff-channels = <
19 19>;
};
};
};