FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/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.
    
      wake-gpios:
        maxItems: 1
        description:
          Optional GPIO specifier for the touchscreen's wake 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.
    
      atmel,wakeup-method:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: |
          The WAKE line is an active-low input that is used to wake up the touch
          controller from deep-sleep mode before communication with the controller
          could be started. This optional feature used to minimize current
          consumption when the controller is in deep sleep mode. This feature is
          relevant only to some controller families, like mXT1386 controller for
          example.
    
          The WAKE pin can be connected in one of the following ways:
           1) left permanently low
           2) connected to the I2C-compatible SCL pin
           3) connected to a GPIO pin on the host
        enum:
          - 0 # ATMEL_MXT_WAKEUP_NONE
          - 1 # ATMEL_MXT_WAKEUP_I2C_SCL
          - 2 # ATMEL_MXT_WAKEUP_GPIO
        default: 0
    
      wakeup-source:
        type: boolean
    
    required:
      - compatible
      - reg
      - interrupts
    
    additionalProperties: false
    
    examples:
      - |
        #include <dt-bindings/interrupt-controller/irq.h>
        #include <dt-bindings/input/atmel-maxtouch.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>;
           atmel,wakeup-method = <ATMEL_MXT_WAKEUP_I2C_SCL>;
         };
       };
   
   ...

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