linux/Documentation/devicetree/bindings/input/tca8418_keypad.txt
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   1This binding is based on the matrix-keymap binding with the following
   2changes:
   3
   4keypad,num-rows and keypad,num-columns are required.
   5
   6Required properties:
   7- compatible: "ti,tca8418"
   8- reg: the I2C address
   9- interrupts: IRQ line number, should trigger on falling edge
  10- linux,keymap: Keys definitions, see keypad-matrix.
  11