xref: /linux/Documentation/devicetree/bindings/iio/adc/ti,ads131m02.yaml (revision c17ee635fd3a482b2ad2bf5e269755c2eae5f25e)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/ti,ads131m02.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Texas Instruments ADS131M0x 2-, 3-, 4-, 6- and 8-Channel ADCs

maintainers:
  - Oleksij Rempel <o.rempel@pengutronix.de>

description: |
  The ADS131M0x are a family of multichannel, simultaneous sampling,
  24-bit, delta-sigma, analog-to-digital converters (ADCs) with a
  built-in programmable gain amplifier (PGA) and internal reference.
  Communication with the ADC chip is via SPI.

  Datasheets:
  - ADS131M02: https://www.ti.com/lit/ds/symlink/ads131m02.pdf
  - ADS131M03: https://www.ti.com/lit/ds/symlink/ads131m03.pdf
  - ADS131M04: https://www.ti.com/lit/ds/symlink/ads131m04.pdf
  - ADS131M06: https://www.ti.com/lit/ds/symlink/ads131m06.pdf
  - ADS131M08: https://www.ti.com/lit/ds/symlink/ads131m08.pdf

properties:
  compatible:
    enum:
      - ti,ads131m02
      - ti,ads131m03
      - ti,ads131m04
      - ti,ads131m06
      - ti,ads131m08

  reg:
    description: SPI chip select number.

  clocks:
    description:
      Phandle to the external clock source required by the ADC's CLKIN pin.
      The datasheet recommends specific frequencies based on the desired power
      mode (e.g., 8.192 MHz for High-Resolution mode).
    maxItems: 1

  avdd-supply:
    description: Analog power supply (AVDD).

  dvdd-supply:
    description: Digital power supply (DVDD).

  interrupts:
    description: DRDY (Data Ready) output signal.
    maxItems: 1

  reset-gpios:
    description: Optional RESET signal.
    maxItems: 1

  clock-names:
    description:
      Indicates if a crystal oscillator (XTAL) or CMOS signal is connected
      (CLKIN). Note that XTAL mode is only supported on ADS131M06 and ADS131M08.
    enum: [xtal, clkin]

  refin-supply:
    description: Optional external reference supply (REFIN).

  '#address-cells':
    const: 1

  '#size-cells':
    const: 0

required:
  - compatible
  - reg
  - clocks
  - clock-names
  - avdd-supply
  - dvdd-supply

patternProperties:
  "^channel@[0-7]$":
    type: object
    $ref: /schemas/iio/adc/adc.yaml#
    description: Properties for a single ADC channel.

    properties:
      reg:
        description: The channel index (0-7).
        minimum: 0
        maximum: 7  # Max channels on ADS131M08

      label: true

    required:
      - reg

    unevaluatedProperties: false

allOf:
  - $ref: /schemas/spi/spi-peripheral-props.yaml#

  - if:
      # 20-pin devices: M02, M03, M04
      # These do not support XTAL or REFIN.
      properties:
        compatible:
          enum:
            - ti,ads131m02
            - ti,ads131m03
            - ti,ads131m04
    then:
      properties:
        clock-names:
          const: clkin
        refin-supply: false

  - if:
      # ADS131M02: 2 channels max (0-1)
      properties:
        compatible:
          contains:
            const: ti,ads131m02
    then:
      patternProperties:
        "^channel@[0-1]$":
          properties:
            reg:
              maximum: 1
        "^channel@[2-7]$": false

  - if:
      # ADS131M03: 3 channels max (0-2)
      properties:
        compatible:
          contains:
            const: ti,ads131m03
    then:
      patternProperties:
        "^channel@[0-2]$":
          properties:
            reg:
              maximum: 2
        "^channel@[3-7]$": false

  - if:
      # ADS131M04: 4 channels max (0-3)
      properties:
        compatible:
          contains:
            const: ti,ads131m04
    then:
      patternProperties:
        "^channel@[0-3]$":
          properties:
            reg:
              maximum: 3
        "^channel@[4-7]$": false

  - if:
      # ADS131M06: 6 channels max (0-5)
      properties:
        compatible:
          contains:
            const: ti,ads131m06
    then:
      patternProperties:
        "^channel@[0-5]$":
          properties:
            reg:
              maximum: 5
        "^channel@[6-7]$": false

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/clock/stm32mp1-clks.h>

    spi1 {
        #address-cells = <1>;
        #size-cells = <0>;

        adc@0 {
            compatible = "ti,ads131m02";
            reg = <0>;
            spi-max-frequency = <8000000>;

            clocks = <&rcc CK_MCO2>;
            clock-names = "clkin";

            avdd-supply = <&vdd_ana>;
            dvdd-supply = <&vdd_dig>;

            #address-cells = <1>;
            #size-cells = <0>;

            channel@0 {
                reg = <0>;
                label = "input_voltage";
            };

            channel@1 {
                reg = <1>;
                label = "input_current";
            };
        };
    };