elan_i2c.txt

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    1 Elantech I2C Touchpad
    2 
    3 Required properties:
    4 - compatible: must be "elan,ekth3000".
    5 - reg: I2C address of the chip.
    6 - interrupts: interrupt to which the chip is connected (see interrupt
    7   binding[0]).
    8 
    9 Optional properties:
   10 - wakeup-source: touchpad can be used as a wakeup source.
   11 - pinctrl-names: should be "default" (see pinctrl binding [1]).
   12 - pinctrl-0: a phandle pointing to the pin settings for the device (see
   13   pinctrl binding [1]).
   14 - vcc-supply: a phandle for the regulator supplying 3.3V power.
   15 - elan,trackpoint: touchpad can support a trackpoint (boolean)
   16 - elan,clickpad: touchpad is a clickpad (the entire surface is a button)
   17 - elan,middle-button: touchpad has a physical middle button
   18 - elan,x_traces: number of antennas on the x axis
   19 - elan,y_traces: number of antennas on the y axis
   20 - some generic touchscreen properties [2]:
   21   * touchscreen-size-x
   22   * touchscreen-size-y
   23   * touchscreen-x-mm
   24   * touchscreen-y-mm
   25 
   26 
   27 [0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
   28 [1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
   29 [2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
   30 
   31 Example:
   32         &i2c1 {
   33                 /* ... */
   34 
   35                 touchpad@15 {
   36                         compatible = "elan,ekth3000";
   37                         reg = <0x15>;
   38                         interrupt-parent = <&gpio4>;
   39                         interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
   40                         wakeup-source;
   41                 };
   42 
   43                 /* ... */
   44         };

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sys/contrib/device-tree/Bindings/input/elan_i2c.txt