Documentation/devicetree/bindings/input/atmel,maxtouch.yaml

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

title: Atmel maXTouch touchscreen/touchpad

maintainers:
  - Nick Dyer <nick@shmanahar.org>
  - Linus Walleij <linus.walleij@linaro.org>

description: |
  Atmel maXTouch touchscreen or touchpads such as the mXT244
  and similar devices.

properties:
  compatible:
    const: atmel,maxtouch

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  vdda-supply:
    description:
      Optional regulator for the AVDD analog voltage.

  vdd-supply:
    description:
      Optional regulator for the VDD digital voltage.

  reset-gpios:
    maxItems: 1
    description:
      Optional GPIO specifier for the touchscreen's reset pin
      (active low). The line must be flagged with
      GPIO_ACTIVE_LOW.

  linux,gpio-keymap:
    $ref: /schemas/types.yaml#/definitions/uint32-array
    description: |
      When enabled, the SPT_GPIOPWN_T19 object sends messages
      on GPIO bit changes. An array of up to 8 entries can be provided
      indicating the Linux keycode mapped to each bit of the status byte,
      starting at the LSB. Linux keycodes are defined in
      <dt-bindings/input/input.h>.

      Note: the numbering of the GPIOs and the bit they start at varies
      between maXTouch devices. You must either refer to the documentation,
      or experiment to determine which bit corresponds to which input. Use
      KEY_RESERVED for unused padding values.

required:
  - compatible
  - reg
  - interrupts

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/gpio/gpio.h>
    i2c {
      #address-cells = <1>;
      #size-cells = <0>;
      touchscreen@4a {
        compatible = "atmel,maxtouch";
        reg = <0x4a>;
        interrupt-parent = <&gpio>;
        interrupts = <26 IRQ_TYPE_EDGE_FALLING>;
        reset-gpios = <&gpio 27 GPIO_ACTIVE_LOW>;
        vdda-supply = <&ab8500_ldo_aux2_reg>;
        vdd-supply = <&ab8500_ldo_aux5_reg>;
      };
    };

...