xref: /linux/Documentation/devicetree/bindings/gpio/maxim,max31910.yaml (revision fcb117e0758d1462128a50c5788555e03b48833b)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/gpio/maxim,max31910.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Maxim MAX3191x GPIO serializer

maintainers:
  - Lukas Wunner <lukas@wunner.de>

properties:
  compatible:
    enum:
      - maxim,max31910
      - maxim,max31911
      - maxim,max31912
      - maxim,max31913
      - maxim,max31953
      - maxim,max31963

  reg:
    maxItems: 1

  gpio-controller: true

  '#gpio-cells':
    const: 2

  '#daisy-chained-devices':
    description: Number of chips in the daisy-chain.
    default: 1

  maxim,modesel-gpios:
    description:
      GPIO pins to configure modesel of each chip. The number of GPIOs must
      equal "#daisy-chained-devices" (if each chip is driven by a separate pin)
      or 1 (if all chips are wired to the same pin).

  maxim,fault-gpios:
    description:
      GPIO pins to read fault of each chip. The number of GPIOs must equal
      "#daisy-chained-devices" or 1.

  maxim,db0-gpios:
    description:
      GPIO pins to configure debounce of each chip. The number of GPIOs must
      equal "#daisy-chained-devices" or 1.

  maxim,db1-gpios:
    description:
      GPIO pins to configure debounce of each chip. The number of GPIOs must
      equal "maxim,db0-gpios".

  maxim,modesel-8bit:
    description:
      Boolean whether the modesel pin of the chips is pulled high (8-bit mode).
      Use this if the modesel pin is hardwired and consequently
      "maxim,modesel-gpios" cannot be specified. By default if neither this nor
      "maxim,modesel-gpios" is given, the driver assumes that modesel is pulled
      low (16-bit mode).
    type: boolean

  maxim,ignore-undervoltage:
    description:
      Boolean whether to ignore undervoltage alarms signaled by the
      "maxim,fault-gpios" or by the status byte (in 16-bit mode). Use this if
      the chips are powered through 5VOUT instead of VCC24V, in which case they
      will constantly signal undervoltage.
    type: boolean

required:
  - compatible
  - reg
  - gpio-controller
  - '#gpio-cells'

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

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/gpio/gpio.h>

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

        gpio@0 {
            compatible = "maxim,max31913";
            reg = <0>;
            gpio-controller;
            #gpio-cells = <2>;

            maxim,modesel-gpios = <&gpio2 23>;
            maxim,fault-gpios   = <&gpio2 24 GPIO_ACTIVE_LOW>;
            maxim,db0-gpios     = <&gpio2 25>;
            maxim,db1-gpios     = <&gpio2 26>;

            spi-max-frequency = <25000000>;
        };
    };