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

   1 NXP LPC32xx Key Scan Interface
   2
   3 This binding is based on the matrix-keymap binding with the following
   4 changes:
   5
   6 Required Properties:
   7 - compatible: Should be "nxp,lpc3220-key"
   8 - reg: Physical base address of the controller and length of memory mapped
   9   region.
  10 - interrupts: The interrupt number to the cpu.
  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 Note: keypad,num-rows and keypad,num-columns are required, and must be equal
  18 since LPC32xx only supports square matrices
  19
  20 Example:
  21
  22         key@40050000 {
  23                 compatible = "nxp,lpc3220-key";
  24                 reg = <0x40050000 0x1000>;
  25                 interrupts = <54 0>;
  26                 keypad,num-rows = <1>;
  27                 keypad,num-columns = <1>;
  28                 nxp,debounce-delay-ms = <3>;
  29                 nxp,scan-delay-ms = <34>;
  30                 linux,keymap = <0x00000002>;
  31         };