Documentation/devicetree/bindings/input/lpc32xx-key.txt

   1 NXP LPC32xx Key Scan Interface
   2
   3 Required Properties:
   4 - compatible: Should be "nxp,lpc3220-key"
   5 - reg: Physical base address of the controller and length of memory mapped
   6   region.
   7 - interrupts: The interrupt number to the cpu.
   8 - keypad,num-rows: Number of rows and columns, e.g. 1: 1x1, 6: 6x6
   9 - keypad,num-columns: Must be equal to keypad,num-rows since LPC32xx only
  10   supports square matrices
  11 - nxp,debounce-delay-ms: Debounce delay in ms
  12 - nxp,scan-delay-ms: Repeated scan period in ms
  13 - linux,keymap: the key-code to be reported when the key is pressed
  14   and released, see also
  15   Documentation/devicetree/bindings/input/matrix-keymap.txt
  16
  17 Example:
  18
  19         key@40050000 {
  20                 compatible = "nxp,lpc3220-key";
  21                 reg = <0x40050000 0x1000>;
  22                 interrupts = <54 0>;
  23                 keypad,num-rows = <1>;
  24                 keypad,num-columns = <1>;
  25                 nxp,debounce-delay-ms = <3>;
  26                 nxp,scan-delay-ms = <34>;
  27                 linux,keymap = <0x00000002>;
  28         };