dt-bindings: adc: provide max34408/9 device tree binding document

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/iio/adc/maxim,max34408.yaml#

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

title: Maxim MAX34408/MAX34409 current monitors with overcurrent control

maintainers:

  - Ivan Mikhaylov <fr0st61te@gmail.com>

description: |

  The MAX34408/MAX34409 are two- and four-channel current monitors that are

  configured and monitored with a standard I2C/SMBus serial interface. Each

  unidirectional current sensor offers precision high-side operation with a

  low full-scale sense voltage. The devices automatically sequence through

  two or four channels and collect the current-sense samples and average them

  to reduce the effect of impulse noise. The raw ADC samples are compared to

  user-programmable digital thresholds to indicate overcurrent conditions.

  Overcurrent conditions trigger a hardware output to provide an immediate

  indication to shut down any necessary external circuitry.

  Specifications about the devices can be found at:

  https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409.pdf

properties:

  compatible:

    enum:

      - maxim,max34408

      - maxim,max34409

  "#address-cells":

    const: 1

  "#size-cells":

    const: 0

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  powerdown-gpios:

    description:

      Shutdown Output. Open-drain output. This output transitions to high impedance

      when any of the digital comparator thresholds are exceeded as long as the ENA

      pin is high.

    maxItems: 1

  powerdown-status-gpios:

    description:

      SHTDN Enable Input. CMOS digital input. Connect to GND to clear the latch and

      unconditionally deassert (force low) the SHTDN output and reset the shutdown

      delay. Connect to VDD to enable normal latch operation of the SHTDN output.

    maxItems: 1

  vdd-supply: true

patternProperties:

  "^channel@[0-3]$":

    $ref: adc.yaml

    type: object

    description:

      Represents the internal channels of the ADC.

    properties:

      reg:

        items:

          - minimum: 0

            maximum: 3

      maxim,rsense-val-micro-ohms:

        description:

          Adjust the Rsense value to monitor higher or lower current levels for

          input.

        enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000]

        default: 1000

    required:

      - reg

      - maxim,rsense-val-micro-ohms

    unevaluatedProperties: false

required:

  - compatible

  - reg

allOf:

  - if:

      properties:

        compatible:

          contains:

            const: maxim,max34408

    then:

      patternProperties:

        "^channel@[2-3]$": false

        "^channel@[0-1]$":

          properties:

            reg:

              maximum: 1

    else:

      patternProperties:

        "^channel@[0-3]$":

          properties:

            reg:

              maximum: 3

additionalProperties: false

examples:

  - |

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

    i2c {

        #address-cells = <1>;

        #size-cells = <0>;

        adc@1e {

              compatible = "maxim,max34409";

              reg = <0x1e>;

              powerdown-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;

              powerdown-status-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;

              #address-cells = <1>;

              #size-cells = <0>;

              channel@0 {

                  reg = <0x0>;

                  maxim,rsense-val-micro-ohms = <5000>;

              };

              channel@1 {

                  reg = <0x1>;

                  maxim,rsense-val-micro-ohms = <10000>;

             };

        };

    };