xref: /linux/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml (revision 3a39d672e7f48b8d6b91a09afa4b55352773b4b5)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/touchscreen/zinitix,bt400.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Zinitix BT4xx and BT5xx series touchscreen controller

description: The Zinitix BT4xx and BT5xx series of touchscreen controllers
  are Korea-produced touchscreens with embedded microcontrollers. The
  BT4xx series was produced 2010-2013 and the BT5xx series 2013-2014.

maintainers:
  - Michael Srba <Michael.Srba@seznam.cz>
  - Linus Walleij <linus.walleij@linaro.org>

allOf:
  - $ref: touchscreen.yaml#
  - $ref: ../input.yaml#

properties:
  $nodename:
    pattern: "^touchscreen(@.*)?$"

  compatible:
    enum:
      - zinitix,bt402
      - zinitix,bt403
      - zinitix,bt404
      - zinitix,bt412
      - zinitix,bt413
      - zinitix,bt431
      - zinitix,bt432
      - zinitix,bt531
      - zinitix,bt532
      - zinitix,bt538
      - zinitix,bt541
      - zinitix,bt548
      - zinitix,bt554
      - zinitix,at100

  reg:
    description: I2C address on the I2C bus

  clock-frequency:
    description: I2C client clock frequency, defined for host when using
      the device on the I2C bus
    minimum: 0
    maximum: 400000

  interrupts:
    description: Interrupt to host
    maxItems: 1

  vcca-supply:
    description: Analog power supply regulator on the VCCA pin

  vdd-supply:
    description: Digital power supply regulator on the VDD pin.
      In older device trees this can be the accidental name for the analog
      supply on the VCCA pin, and in that case the deprecated vddo-supply is
      used for the digital power supply.

  vddo-supply:
    description: Deprecated name for the digital power supply, use vdd-supply
      as this reflects the real name of the pin. If this supply is present,
      the vdd-supply represents VCCA instead of VDD. Implementers should first
      check for this property, and if it is present assume that the vdd-supply
      represents the analog supply.
    deprecated: true

  reset-gpios:
    description: Reset line for the touchscreen, should be tagged
      as GPIO_ACTIVE_LOW

  zinitix,mode:
    description: Mode of reporting touch points. Some modes may not work
      with a particular ts firmware for unknown reasons. Available modes are
      1 and 2. Mode 2 is the default and preferred.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [1, 2]

  linux,keycodes:
    description:
      This property specifies an array of keycodes assigned to the
      touch-keys that can be present in some touchscreen configurations.
      If the touch-keys are enabled, controller firmware will assign some
      touch sense lines to those keys.
    minItems: 1
    maxItems: 8

  touchscreen-size-x: true
  touchscreen-size-y: true
  touchscreen-fuzz-x: true
  touchscreen-fuzz-y: true

additionalProperties: false

required:
  - compatible
  - reg
  - interrupts
  - touchscreen-size-x
  - touchscreen-size-y

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    #include <dt-bindings/gpio/gpio.h>
    i2c {
      #address-cells = <1>;
      #size-cells = <0>;

      touchscreen@20 {
        compatible = "zinitix,bt541";
        reg = <0x20>;
        interrupt-parent = <&gpio>;
        interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
        vcca-supply = <&reg_vcca_tsp>;
        vdd-supply = <&reg_vdd_tsp>;
        touchscreen-size-x = <540>;
        touchscreen-size-y = <960>;
        zinitix,mode = <2>;
      };
    };