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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/iio/amplifiers/adi,hmc425a.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/iio/amplifiers/adi,hmc425a.yaml#

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$schema: http://devicetree.org/meta-schemas/core.yaml#

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title: Analog Devices HMC425A and similar Digital Step Attenuators

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maintainers:

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  - Michael Hennerich <michael.hennerich@analog.com>

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description: |

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  Digital Step Attenuator IIO devices with gpio interface.

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  Offer various frequency and attenuation ranges.

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  ADRF5750 2 dB LSB, 4-Bit, Silicon Digital Attenuator, 10 MHz to 60 GHz

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    https://www.analog.com/media/en/technical-documentation/data-sheets/adrf5740.pdf

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  HMC425A 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz

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    https://www.analog.com/media/en/technical-documentation/data-sheets/hmc425A.pdf

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  HMC540S 1 dB LSB Silicon MMIC 4-Bit Digital Positive Control Attenuator, 0.1 - 8 GHz

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    https://www.analog.com/media/en/technical-documentation/data-sheets/hmc540s.pdf

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  LTC6373 is a 3-Bit precision instrumentation amplifier with fully differential outputs

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    https://www.analog.com/media/en/technical-documentation/data-sheets/ltc6373.pdf

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properties:

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  compatible:

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    enum:

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      - adi,adrf5740

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      - adi,hmc425a

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      - adi,hmc540s

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      - adi,ltc6373

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  vcc-supply: true

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  ctrl-gpios:

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    description:

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      Must contain an array of GPIO specifiers, referring to the GPIO pins

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      connected to the control pins.

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        ADRF5740  - 4 GPIO connected to D2-D5

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        HMC540S   - 4 GPIO connected to V1-V4

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        HMC425A   - 6 GPIO connected to V1-V6

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        LTC6373   - 3 GPIO connected to A0-A2

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    minItems: 1

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    maxItems: 6

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allOf:

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  - if:

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      properties:

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        compatible:

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          contains:

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            const: adi,hmc425a

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    then:

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      properties:

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        ctrl-gpios:

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          minItems: 6

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          maxItems: 6

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  - if:

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      properties:

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        compatible:

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          contains:

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            anyOf:

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              - const: adi,adrf5740

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              - const: adi,hmc540s

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    then:

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      properties:

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        ctrl-gpios:

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          minItems: 4

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          maxItems: 4

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  - if:

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      properties:

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        compatible:

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          contains:

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            const: adi,ltc6373

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    then:

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      properties:

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        ctrl-gpios:

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          minItems: 3

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          maxItems: 3

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required:

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  - compatible

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  - ctrl-gpios

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additionalProperties: false

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examples:

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  - |

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    #include <dt-bindings/gpio/gpio.h>

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    gpio_hmc425a: hmc425a {

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      compatible = "adi,hmc425a";

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      ctrl-gpios = <&gpio 40 GPIO_ACTIVE_HIGH>,

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        <&gpio 39 GPIO_ACTIVE_HIGH>,

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        <&gpio 38 GPIO_ACTIVE_HIGH>,

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        <&gpio 37 GPIO_ACTIVE_HIGH>,

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        <&gpio 36 GPIO_ACTIVE_HIGH>,

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        <&gpio 35 GPIO_ACTIVE_HIGH>;

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      vcc-supply = <&foo>;

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    };

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...

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