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# SPDX-License-Identifier: (GPL-
2.
0-only OR BSD-
2-Clause)
%YAML
1.
2
---
$id:
http://devicetree.org/schemas/iio/adc/adi,ad4695.yaml#
$schema:
http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices Easy Drive Multiplexed SAR Analog to Digital Converters
maintainers:
- Michael Hennerich <Michael.Hennerich@analog.com>
- Nuno Sá <nuno.sa@analog.com>
description: |
A family of similar multi-channel analog to digital converters with SPI bus.
*
https://www.analog.com/en/products/ad4695.html
*
https://www.analog.com/en/products/ad4696.html
*
https://www.analog.com/en/products/ad4697.html
*
https://www.analog.com/en/products/ad4698.html
$ref: /schemas/spi/spi-peripheral-props.yaml#
properties:
compatible:
enum:
- adi,ad4695
- adi,ad4696
- adi,ad4697
- adi,ad4698
reg:
maxItems:
1
spi-max-frequency:
maximum:
80000000
spi-cpol: true
spi-cpha: true
spi-rx-bus-width:
minimum:
1
maximum:
4
avdd-supply:
description: Analog power supply.
vio-supply:
description: I/O pin power supply.
ldo-in-supply:
description: Internal LDO Input. Mutually exclusive with vdd-supply.
vdd-supply:
description: Core power supply. Mutually exclusive with ldo-in-supply.
ref-supply:
description:
External reference voltage. Mutually exclusive with refin-supply.
refin-supply:
description:
Internal reference buffer input. Mutually exclusive with ref-supply.
com-supply:
description: Common voltage supply for pseudo-differential analog inputs.
adi,no-ref-current-limit:
$ref: /schemas/types.yaml#/definitions/flag
description:
When this flag is present, the REF Overvoltage Reduced Current protection
is disabled.
adi,no-ref-high-z:
$ref: /schemas/types.yaml#/definitions/flag
description:
Enable this flag if the ref-supply requires Reference Input High-Z Mode
to be disabled for proper operation.
cnv-gpios:
description: The Convert Input (CNV). If omitted, CNV is tied to SPI CS.
maxItems:
1
reset-gpios:
description: The Reset Input (RESET). Should be configured GPIO_ACTIVE_LOW.
maxItems:
1
pwms:
description: PWM signal connected to the CNV pin.
maxItems:
1
interrupts:
minItems:
1
items:
- description: Signal coming from the BSY_ALT_GP0 pin (ALERT or BUSY).
- description: Signal coming from the GP2 pin (ALERT).
- description: Signal coming from the GP3 pin (BUSY).
interrupt-names:
minItems:
1
items:
- const: gp0
- const: gp2
- const: gp3
gpio-controller: true
"#gpio-cells":
const:
2
description: |
The first cell is the GPn number:
0 to
3.
The second cell takes standard GPIO flags.
'#trigger-source-cells':
description: |
First cell indicates the output signal:
0 = BUSY,
1 = ALERT.
Second cell indicates which GPn pin is used:
0,
2 or
3.
For convenience, macros for these values are available in
dt-bindings/iio/adc/adi,ad4695.h.
const:
2
"#address-cells":
const:
1
"#size-cells":
const:
0
patternProperties:
"^in(?:[
13579]|
1[
135])-supply$":
description:
Optional voltage supply for odd numbered channels when they are used as
the negative input for a pseudo-differential channel.
"^channel@[
0-
9a-f]$":
type: object
$ref: adc.yaml
unevaluatedProperties: false
description:
Describes each individual channel. In addition the properties defined
below, bipolar from adc.yaml is also supported.
properties:
reg:
maximum:
15
common-mode-channel:
description:
Describes the common mode channel for single channels.
0xFF is REFGND
and OxFE is COM. Macros are available for these values in
dt-bindings/iio/adc/adi,ad4695.h. Values
1 to
15 correspond to INx
inputs. Only odd numbered INx inputs can be used as common mode
channels.
enum: [
1,
3,
5,
7,
9,
11,
13,
15,
0xFE,
0xFF]
default:
0xFF
adi,no-high-z:
$ref: /schemas/types.yaml#/definitions/flag
description:
Enable this flag if the input pin requires the Analog Input High-Z
Mode to be disabled for proper operation.
required:
- reg
allOf:
# bipolar mode can't be used with REFGND
- if:
properties:
common-mode-channel:
const:
0xFF
then:
properties:
bipolar: false
required:
- compatible
- reg
- avdd-supply
- vio-supply
allOf:
- oneOf:
- required:
- ldo-in-supply
- required:
- vdd-supply
- oneOf:
- required:
- ref-supply
- required:
- refin-supply
# the internal reference buffer always requires high-z mode
- if:
required:
- refin-supply
then:
properties:
adi,no-ref-high-z: false
# limit channels for
8-channel chips
- if:
properties:
compatible:
contains:
enum:
- adi,ad4697
- adi,ad4698
then:
patternProperties:
"^in(?:
9|
1[
135])-supply$": false
"^channel@[
0-
7]$":
properties:
reg:
maximum:
7
common-mode-channel:
enum: [
1,
3,
5,
7,
0xFE,
0xFF]
"^channel@[
8-
9a-f]$": false
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/iio/adc/adi,ad4695.h>
spi {
#address-cells = <
1>;
#size-cells = <
0>;
adc@
0 {
compatible = "adi,ad4695";
reg = <
0>;
spi-cpol;
spi-cpha;
spi-max-frequency = <
80000000>;
avdd-supply = <&power_supply>;
ldo-in-supply = <&power_supply>;
vio-supply = <&io_supply>;
refin-supply = <&supply_5V>;
com-supply = <&supply_2V5>;
in3-supply = <&supply_2V5>;
reset-gpios = <&gpio
1 GPIO_ACTIVE_LOW>;
#address-cells = <
1>;
#size-cells = <
0>;
/* Pseudo-differential channel between IN0 and REFGND. */
channel@
0 {
reg = <
0>;
};
/* Pseudo-differential channel between IN1 and COM. */
channel@
1 {
reg = <
1>;
common-mode-channel = <AD4695_COMMON_MODE_COM>;
bipolar;
};
/* Pseudo-differential channel between IN2 and IN3. */
channel@
2 {
reg = <
2>;
common-mode-channel = <
3>;
bipolar;
};
};
};