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     1 Cypress I2C Touchpad
    2 
    3 Required properties:
    4 - compatible: must be "cypress,cyapa".
    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 
   16 [0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
   17 [1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
   18 
   19 Example:
   20         &i2c0 {
   21                 /* ... */
   22 
   23                 /* Cypress Gen3 touchpad */
   24                 touchpad@67 {
   25                         compatible = "cypress,cyapa";
   26                         reg = <0x67>;
   27                         interrupt-parent = <&gpio>;
   28                         interrupts = <2 IRQ_TYPE_EDGE_FALLING>; /* GPIO 2 */
   29                         wakeup-source;
   30                 };
   31 
   32                 /* Cypress Gen5 and later touchpad */
   33                 touchpad@24 {
   34                         compatible = "cypress,cyapa";
   35                         reg = <0x24>;
   36                         interrupt-parent = <&gpio>;
   37                         interrupts = <2 IRQ_TYPE_EDGE_FALLING>; /* GPIO 2 */
   38                         wakeup-source;
   39                 };
   40 
   41                 /* ... */
   42         };
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