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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/amplifiers/adi,hmc425a.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices HMC425A and similar Digital Step Attenuators
maintainers:
- Michael Hennerich <michael.hennerich@analog.com>
description: |
Digital Step Attenuator IIO devices with gpio interface.
Offer various frequency and attenuation ranges.
ADRF5750 2 dB LSB, 4-Bit, Silicon Digital Attenuator, 10 MHz to 60 GHz
https://www.analog.com/media/en/technical-documentation/data-sheets/adrf5740.pdf
HMC425A 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
https://www.analog.com/media/en/technical-documentation/data-sheets/hmc425A.pdf
HMC540S 1 dB LSB Silicon MMIC 4-Bit Digital Positive Control Attenuator, 0.1 - 8 GHz
https://www.analog.com/media/en/technical-documentation/data-sheets/hmc540s.pdf
LTC6373 is a 3-Bit precision instrumentation amplifier with fully differential outputs
https://www.analog.com/media/en/technical-documentation/data-sheets/ltc6373.pdf
properties:
compatible:
enum:
- adi,adrf5740
- adi,hmc425a
- adi,hmc540s
- adi,ltc6373
vcc-supply: true
ctrl-gpios:
description:
Must contain an array of GPIO specifiers, referring to the GPIO pins
connected to the control pins.
ADRF5740 - 4 GPIO connected to D2-D5
HMC540S - 4 GPIO connected to V1-V4
HMC425A - 6 GPIO connected to V1-V6
LTC6373 - 3 GPIO connected to A0-A2
minItems: 1
maxItems: 6
allOf:
- if:
properties:
compatible:
contains:
const: adi,hmc425a
then:
properties:
ctrl-gpios:
minItems: 6
maxItems: 6
- if:
properties:
compatible:
contains:
anyOf:
- const: adi,adrf5740
- const: adi,hmc540s
then:
properties:
ctrl-gpios:
minItems: 4
maxItems: 4
- if:
properties:
compatible:
contains:
const: adi,ltc6373
then:
properties:
ctrl-gpios:
minItems: 3
maxItems: 3
required:
- compatible
- ctrl-gpios
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
gpio_hmc425a: hmc425a {
compatible = "adi,hmc425a";
ctrl-gpios = <&gpio 40 GPIO_ACTIVE_HIGH>,
<&gpio 39 GPIO_ACTIVE_HIGH>,
<&gpio 38 GPIO_ACTIVE_HIGH>,
<&gpio 37 GPIO_ACTIVE_HIGH>,
<&gpio 36 GPIO_ACTIVE_HIGH>,
<&gpio 35 GPIO_ACTIVE_HIGH>;
vcc-supply = <&foo>;
};
...
|
