xref: /freebsd/sys/contrib/device-tree/Bindings/serio/ps2-gpio.yaml (revision 8bab661a3316d8bd9b9fbd11a3b4371b91507bd2)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/serio/ps2-gpio.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: GPIO based PS/2

maintainers:
  - Danilo Krummrich <danilokrummrich@dk-develop.de>

properties:
  compatible:
    const: ps2-gpio

  data-gpios:
    description:
      the gpio used for the data signal - this should be flagged as
      active high using open drain with (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)
      from <dt-bindings/gpio/gpio.h> since the signal is open drain by
      definition
    maxItems: 1

  clk-gpios:
    description:
      the gpio used for the clock signal - this should be flagged as
      active high using open drain with (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)
      from <dt-bindings/gpio/gpio.h> since the signal is open drain by
      definition
    maxItems: 1

  interrupts:
    description:
      The given interrupt should trigger on the falling edge of the clock line.
    maxItems: 1

  write-enable:
    type: boolean
    description:
      Indicates whether write function is provided to serio device. Possibly
      providing the write function will not work, because of the tough timing
      requirements.

required:
  - compatible
  - data-gpios
  - clk-gpios
  - interrupts

additionalProperties: false

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

    ps2 {
        compatible = "ps2-gpio";
        interrupt-parent = <&gpio>;
        interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
        data-gpios = <&gpio 24 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
        clk-gpios = <&gpio 23 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
        write-enable;
    };