Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt

   1 * GPIO driven matrix keypad device tree bindings
   2
   3 GPIO driven matrix keypad is used to interface a SoC with a matrix keypad.
   4 The matrix keypad supports multiple row and column lines, a key can be
   5 placed at each intersection of a unique row and a unique column. The matrix
   6 keypad can sense a key-press and key-release by means of GPIO lines and
   7 report the event using GPIO interrupts to the cpu.
   8
   9 Required Properties:
  10 - compatible:           Should be "gpio-matrix-keypad"
  11 - row-gpios:            List of gpios used as row lines. The gpio specifier
  12                         for this property depends on the gpio controller to
  13                         which these row lines are connected.
  14 - col-gpios:            List of gpios used as column lines. The gpio specifier
  15                         for this property depends on the gpio controller to
  16                         which these column lines are connected.
  17 - linux,keymap:         The definition can be found at
  18                         bindings/input/matrix-keymap.txt
  19
  20 Optional Properties:
  21 - linux,no-autorepeat:  do no enable autorepeat feature.
  22 - wakeup-source:        use any event on keypad as wakeup event.
  23                         (Legacy property supported: "linux,wakeup")
  24 - debounce-delay-ms:    debounce interval in milliseconds
  25 - col-scan-delay-us:    delay, measured in microseconds, that is needed
  26                         before we can scan keypad after activating column gpio
  27
  28 Example:
  29         matrix-keypad {
  30                 compatible = "gpio-matrix-keypad";
  31                 debounce-delay-ms = <5>;
  32                 col-scan-delay-us = <2>;
  33
  34                 row-gpios = <&gpio2 25 0
  35                              &gpio2 26 0
  36                              &gpio2 27 0>;
  37
  38                 col-gpios = <&gpio2 21 0
  39                              &gpio2 22 0>;
  40
  41                 linux,keymap = <0x0000008B
  42                                 0x0100009E
  43                                 0x02000069
  44                                 0x0001006A
  45                                 0x0101001C
  46                                 0x0201006C>;
  47         };