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|
# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/adi,ad7768-1.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices AD7768-1 ADC device driver
maintainers:
- Michael Hennerich <michael.hennerich@analog.com>
description: |
Datasheet at:
https://www.analog.com/media/en/technical-documentation/data-sheets/ad7768-1.pdf
properties:
compatible:
const: adi,ad7768-1
reg:
maxItems: 1
clocks:
maxItems: 1
clock-names:
const: mclk
trigger-sources:
$ref: /schemas/types.yaml#/definitions/phandle-array
minItems: 1
maxItems: 2
description: |
A list of phandles referencing trigger source providers. Each entry
represents a trigger source for the ADC:
- First entry specifies the device responsible for driving the
synchronization (SYNC_IN) pin, as an alternative to adi,sync-in-gpios.
This can be a `gpio-trigger` or another `ad7768-1` device. If the
device's own SYNC_OUT pin is internally connected to its SYNC_IN pin,
reference the device itself or omit this property.
- Second entry optionally defines a GPIO3 pin used as a START signal trigger.
Use the accompanying trigger source cell to identify the type of each entry.
interrupts:
description:
DRDY (Data Ready) pin, which signals conversion results are available.
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
vref-supply:
description:
ADC reference voltage supply
adi,sync-in-gpios:
maxItems: 1
description:
Enables synchronization of multiple devices that require simultaneous
sampling. A pulse is always required if the configuration is changed
in any way, for example if the filter decimation rate changes.
As the line is active low, it should be marked GPIO_ACTIVE_LOW.
regulators:
type: object
description:
list of regulators provided by this controller.
properties:
vcm-output:
$ref: /schemas/regulator/regulator.yaml#
type: object
unevaluatedProperties: false
additionalProperties: false
reset-gpios:
maxItems: 1
spi-cpol: true
spi-cpha: true
"#io-channel-cells":
const: 1
"#trigger-source-cells":
description: |
Cell indicates the trigger output signal: 0 = SYNC_OUT, 1 = GPIO3,
2 = DRDY.
For better readability, macros for these values are available in
dt-bindings/iio/adc/adi,ad7768-1.h.
const: 1
gpio-controller: true
"#gpio-cells":
const: 2
description: |
The first cell is for the GPIO number: 0 to 3.
The second cell takes standard GPIO flags.
required:
- compatible
- reg
- clocks
- clock-names
- vref-supply
- spi-cpol
- spi-cpha
dependencies:
adi,sync-in-gpios:
not:
required:
- trigger-sources
trigger-sources:
not:
required:
- adi,sync-in-gpios
patternProperties:
"^channel@([0-9]|1[0-5])$":
type: object
description: |
Represents the external channels which are connected to the device.
properties:
reg:
maxItems: 1
description: |
The channel number.
label:
description: |
Unique name to identify which channel this is.
required:
- reg
additionalProperties: false
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/gpio/gpio.h>
spi {
#address-cells = <1>;
#size-cells = <0>;
adc@0 {
compatible = "adi,ad7768-1";
reg = <0>;
spi-max-frequency = <2000000>;
spi-cpol;
spi-cpha;
gpio-controller;
#gpio-cells = <2>;
vref-supply = <&adc_vref>;
interrupts = <25 IRQ_TYPE_EDGE_RISING>;
interrupt-parent = <&gpio>;
adi,sync-in-gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
clocks = <&ad7768_mclk>;
clock-names = "mclk";
#address-cells = <1>;
#size-cells = <0>;
channel@0 {
reg = <0>;
label = "channel_0";
};
regulators {
vcm_reg: vcm-output {
regulator-name = "ad7768-1-vcm";
};
};
};
};
...
|
