Documentation/devicetree/bindings/input/input-reset.txt

   1 Input: sysrq reset sequence
   2
   3 A simple binding to represent a set of keys as described in
   4 include/uapi/linux/input.h. This is to communicate a sequence of keys to the
   5 sysrq driver. Upon holding the keys for a specified amount of time (if
   6 specified) the system is sync'ed and reset.
   7
   8 Key sequences are global to the system but all the keys in a set must be coming
   9 from the same input device.
  10
  11 The /chosen node should contain a 'linux,sysrq-reset-seq' child node to define
  12 a set of keys.
  13
  14 Required property:
  15 sysrq-reset-seq: array of Linux keycodes, one keycode per cell.
  16
  17 Optional property:
  18 timeout-ms: duration keys must be pressed together in milliseconds before
  19 generating a sysrq. If omitted the system is rebooted immediately when a valid
  20 sequence has been recognized.
  21
  22 Example:
  23
  24  chosen {
  25                 linux,sysrq-reset-seq {
  26                         keyset = <0x03
  27                                   0x04
  28                                   0x0a>;
  29                         timeout-ms = <3000>;
  30                 };
  31          };
  32
  33 Would represent KEY_2, KEY_3 and KEY_9.