FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/input/touchscreen/cypress,cy8ctma340.yaml

     # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
     %YAML 1.2
     ---
     $id: http://devicetree.org/schemas/input/touchscreen/cypress,cy8ctma340.yaml#
     $schema: http://devicetree.org/meta-schemas/core.yaml#
     
     title: Cypress CY8CTMA340 series touchscreen controller bindings
     
     description: The Cypress CY8CTMA340 series (also known as "CYTTSP" after
      the marketing name Cypress TrueTouch Standard Product) touchscreens can
      be connected to either I2C or SPI buses.
    
    maintainers:
      - Javier Martinez Canillas <javier@dowhile0.org>
      - Linus Walleij <linus.walleij@linaro.org>
    
    allOf:
      - $ref: touchscreen.yaml#
    
    properties:
      $nodename:
        pattern: "^touchscreen(@.*)?$"
    
      compatible:
        oneOf:
          - const: cypress,cy8ctma340
          - const: cypress,cy8ctst341
          - const: cypress,cyttsp-spi
            description: Legacy compatible for SPI connected CY8CTMA340
            deprecated: true
          - const: cypress,cyttsp-i2c
            description: Legacy compatible for I2C connected CY8CTMA340
            deprecated: true
    
      reg:
        description: I2C address when used on the I2C bus, or the SPI chip
          select index when used on the SPI bus
    
      clock-frequency:
        description: I2C client clock frequency, defined for host when using
          the device on the I2C bus
        minimum: 0
        maximum: 400000
    
      spi-max-frequency:
        description: SPI clock frequency, defined for host, defined when using
          the device on the SPI bus. The throughput is maximum 2 Mbps so the
          typical value is 2000000, if higher rates are used the total throughput
          needs to be restricted to 2 Mbps.
        minimum: 0
        maximum: 6000000
    
      interrupts:
        description: Interrupt to host
        maxItems: 1
    
      vcpin-supply:
        description: Analog power supply regulator on VCPIN pin
    
      vdd-supply:
        description: Digital power supply regulator on VDD pin
    
      reset-gpios:
        description: Reset line for the touchscreen, should be tagged
          as GPIO_ACTIVE_LOW
    
      bootloader-key:
        description: the 8-byte bootloader key that is required to switch
          the chip from bootloader mode (default mode) to application mode
        $ref: /schemas/types.yaml#/definitions/uint8-array
        minItems: 8
        maxItems: 8
    
      touchscreen-size-x: true
      touchscreen-size-y: true
      touchscreen-fuzz-x: true
      touchscreen-fuzz-y: true
    
      active-distance:
        description: the distance in pixels beyond which a touch must move
          before movement is detected and reported by the device
        $ref: /schemas/types.yaml#/definitions/uint32
        minimum: 0
        maximum: 15
    
      active-interval-ms:
        description: the minimum period in ms between consecutive
          scanning/processing cycles when the chip is in active mode
        minimum: 0
        maximum: 255
    
      lowpower-interval-ms:
        description: the minimum period in ms between consecutive
          scanning/processing cycles when the chip is in low-power mode
        minimum: 0
        maximum: 2550
    
      touch-timeout-ms:
        description: minimum time in ms spent in the active power state while no
         touches are detected before entering low-power mode
       minimum: 0
       maximum: 2550
   
     use-handshake:
       description: enable register-based handshake (boolean). This should only
         be used if the chip is configured to use 'blocking communication with
         timeout' (in this case the device generates an interrupt at the end of
         every scanning/processing cycle)
       $ref: /schemas/types.yaml#/definitions/flag
   
   additionalProperties: false
   
   required:
     - compatible
     - reg
     - interrupts
     - bootloader-key
     - touchscreen-size-x
     - touchscreen-size-y
   
   examples:
     - |
       #include <dt-bindings/interrupt-controller/irq.h>
       #include <dt-bindings/gpio/gpio.h>
       spi {
         #address-cells = <1>;
         #size-cells = <0>;
         num-cs = <1>;
         cs-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
   
         touchscreen@0 {
           compatible = "cypress,cy8ctma340";
           reg = <0>;
           interrupt-parent = <&gpio>;
           interrupts = <20 IRQ_TYPE_EDGE_FALLING>;
           reset-gpios = <&gpio 21 GPIO_ACTIVE_LOW>;
           vdd-supply = <&ldo_aux1_reg>;
           vcpin-supply = <&ldo_aux2_reg>;
           bootloader-key = /bits/ 8 <0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07>;
           touchscreen-size-x = <480>;
           touchscreen-size-y = <800>;
           active-interval-ms = <0>;
           touch-timeout-ms = <255>;
           lowpower-interval-ms = <10>;
         };
       };
   
   ...

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