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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/iio/amplifiers/adi,hmc425a.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Analog Devices HMC425A and similar Digital Step Attenuators8 9maintainers:10 - Michael Hennerich <michael.hennerich@analog.com>11 12description: |13 Digital Step Attenuator IIO devices with gpio interface.14 Offer various frequency and attenuation ranges.15 ADRF5750 2 dB LSB, 4-Bit, Silicon Digital Attenuator, 10 MHz to 60 GHz16 https://www.analog.com/media/en/technical-documentation/data-sheets/adrf5740.pdf17 18 HMC425A 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz19 https://www.analog.com/media/en/technical-documentation/data-sheets/hmc425A.pdf20 21 HMC540S 1 dB LSB Silicon MMIC 4-Bit Digital Positive Control Attenuator, 0.1 - 8 GHz22 https://www.analog.com/media/en/technical-documentation/data-sheets/hmc540s.pdf23 24 LTC6373 is a 3-Bit precision instrumentation amplifier with fully differential outputs25 https://www.analog.com/media/en/technical-documentation/data-sheets/ltc6373.pdf26 27properties:28 compatible:29 enum:30 - adi,adrf574031 - adi,hmc425a32 - adi,hmc540s33 - adi,ltc637334 35 vcc-supply: true36 37 ctrl-gpios:38 description:39 Must contain an array of GPIO specifiers, referring to the GPIO pins40 connected to the control pins.41 ADRF5740 - 4 GPIO connected to D2-D542 HMC540S - 4 GPIO connected to V1-V443 HMC425A - 6 GPIO connected to V1-V644 LTC6373 - 3 GPIO connected to A0-A245 minItems: 146 maxItems: 647 48allOf:49 - if:50 properties:51 compatible:52 contains:53 const: adi,hmc425a54 then:55 properties:56 ctrl-gpios:57 minItems: 658 maxItems: 659 - if:60 properties:61 compatible:62 contains:63 anyOf:64 - const: adi,adrf574065 - const: adi,hmc540s66 then:67 properties:68 ctrl-gpios:69 minItems: 470 maxItems: 471 - if:72 properties:73 compatible:74 contains:75 const: adi,ltc637376 then:77 properties:78 ctrl-gpios:79 minItems: 380 maxItems: 381 82required:83 - compatible84 - ctrl-gpios85 86additionalProperties: false87 88examples:89 - |90 #include <dt-bindings/gpio/gpio.h>91 gpio_hmc425a: hmc425a {92 compatible = "adi,hmc425a";93 ctrl-gpios = <&gpio 40 GPIO_ACTIVE_HIGH>,94 <&gpio 39 GPIO_ACTIVE_HIGH>,95 <&gpio 38 GPIO_ACTIVE_HIGH>,96 <&gpio 37 GPIO_ACTIVE_HIGH>,97 <&gpio 36 GPIO_ACTIVE_HIGH>,98 <&gpio 35 GPIO_ACTIVE_HIGH>;99 vcc-supply = <&foo>;100 };101...102