xref: /linux/Documentation/devicetree/bindings/input/touchscreen/fsl,imx25-tcq.yaml (revision 0fc8f6200d2313278fbf4539bbab74677c685531)

# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/touchscreen/fsl,imx25-tcq.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Freescale mx25 TS conversion queue module

maintainers:
  - Frank Li <Frank.Li@nxp.com>

description:
  mx25 touchscreen conversion queue module which controls the ADC unit of the
  mx25 for attached touchscreens.

properties:
  compatible:
    const: fsl,imx25-tcq

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  fsl,wires:
    description: touch wires number.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [4, 5]

  fsl,pen-debounce-ns:
    description:
      Pen debounce time in nanoseconds.

  fsl,pen-threshold:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      Pen-down threshold for the touchscreen. This is a value
      between 1 and 4096. It is the ratio between the internal reference voltage
      and the measured voltage after the plate was precharged. Resistance between
      plates and therefore the voltage decreases with pressure so that a smaller
      value is equivalent to a higher pressure.

  fsl,settling-time-ns:
    description:
      Settling time in nanoseconds. The settling time is before
      the actual touch detection to wait for an even charge distribution in the
      plate.

allOf:
  - $ref: touchscreen.yaml

required:
  - compatible
  - reg
  - interrupts
  - fsl,wires

unevaluatedProperties: false

examples:
  - |
    touchscreen@50030400 {
        compatible = "fsl,imx25-tcq";
        reg = <0x50030400 0x60>;
        interrupt-parent = <&tscadc>;
        interrupts = <0>;
        fsl,wires = <4>;
    };