linux/Documentation/devicetree/bindings/input/omap-keypad.txt
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Prefs
   1* TI's Keypad Controller device tree bindings
   2
   3TI's Keypad controller is used to interface a SoC with a matrix-type
   4keypad device. The keypad controller supports multiple row and column lines.
   5A key can be placed at each intersection of a unique row and a unique column.
   6The keypad controller can sense a key-press and key-release and report the
   7event using a interrupt to the cpu.
   8
   9This binding is based on the matrix-keymap binding with the following
  10changes:
  11
  12keypad,num-rows and keypad,num-columns are required.
  13
  14Required SoC Specific Properties:
  15- compatible: should be one of the following
  16   - "ti,omap4-keypad": For controllers compatible with omap4 keypad
  17      controller.
  18
  19Optional Properties specific to linux:
  20- linux,keypad-no-autorepeat: do no enable autorepeat feature.
  21
  22Example:
  23        keypad@4ae1c000{
  24                compatible = "ti,omap4-keypad";
  25                keypad,num-rows = <2>;
  26                keypad,num-columns = <8>;
  27                linux,keypad-no-autorepeat;
  28        };
  29