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|
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
# Copyright 2019 Analog Devices Inc.
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/adi,ad7476.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: AD7476 and similar simple SPI ADCs from multiple manufacturers.
maintainers:
- Michael Hennerich <michael.hennerich@analog.com>
description: |
A lot of simple SPI ADCs have very straight forward interfaces.
They typically don't provide a MOSI pin, simply reading out data
on MISO when the clock toggles.
properties:
compatible:
enum:
- adi,ad7091
- adi,ad7091r
- adi,ad7273
- adi,ad7274
- adi,ad7276
- adi,ad7277
- adi,ad7278
- adi,ad7466
- adi,ad7467
- adi,ad7468
- adi,ad7475
- adi,ad7476
- adi,ad7476a
- adi,ad7477
- adi,ad7477a
- adi,ad7478
- adi,ad7478a
- adi,ad7495
- adi,ad7910
- adi,ad7920
- adi,ad7940
- ti,adc081s
- ti,adc101s
- ti,adc121s
- ti,ads7866
- ti,ads7867
- ti,ads7868
- lltc,ltc2314-14
reg:
maxItems: 1
vcc-supply:
description:
Main powersupply voltage for the chips, sometimes referred to as VDD on
datasheets. If there is no separate vref-supply, then this is needed
to establish channel scaling.
vdrive-supply:
description:
Some devices have separate supply for their digital control side.
vref-supply:
description:
Some devices have a specific reference voltage supplied on a different pin
to the other supplies. Needed to be able to establish channel scaling
unless there is also an internal reference available (e.g. ad7091r)
spi-max-frequency: true
adi,conversion-start-gpios:
description: A GPIO used to trigger the start of a conversion
maxItems: 1
required:
- compatible
- reg
additionalProperties: false
allOf:
# Devices where reference is vcc
- if:
properties:
compatible:
contains:
enum:
- adi,ad7091
- adi,ad7276
- adi,ad7277
- adi,ad7278
- adi,ad7466
- adi,ad7467
- adi,ad7468
- adi,ad7940
- ti,adc081s
- ti,adc101s
- ti,adc121s
- ti,ads7866
- ti,ads7868
required:
- vcc-supply
# Devices with a vref
- if:
properties:
compatible:
contains:
enum:
- adi,ad7091r
- adi,ad7273
- adi,ad7274
- adi,ad7475
- lltc,ltc2314-14
then:
properties:
vref-supply: true
else:
properties:
vref-supply: false
# Devices with a vref where it is not optional
- if:
properties:
compatible:
contains:
enum:
- adi,ad7273
- adi,ad7274
- adi,ad7475
- lltc,ltc2314-14
then:
required:
- vref-supply
- if:
properties:
compatible:
contains:
enum:
- adi,ad7475
- adi,ad7495
then:
properties:
vdrive-supply: true
else:
properties:
vdrive-supply: false
- if:
properties:
compatible:
contains:
enum:
- adi,ad7091
- adi,ad7091r
then:
properties:
adi,conversion-start-gpios: true
else:
properties:
adi,conversion-start-gpios: false
examples:
- |
spi {
#address-cells = <1>;
#size-cells = <0>;
adc@0 {
compatible = "adi,ad7091r";
reg = <0>;
spi-max-frequency = <5000000>;
vcc-supply = <&adc_vcc>;
vref-supply = <&adc_vref>;
};
};
...
|
