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Input: sysrq reset sequence
A simple binding to represent a set of keys as described in
include/uapi/linux/input.h. This is to communicate a sequence of keys to the
sysrq driver. Upon holding the keys for a specified amount of time (if
specified) the system is sync'ed and reset.
Key sequences are global to the system but all the keys in a set must be coming
from the same input device.
The /chosen node should contain a 'linux,sysrq-reset-seq' child node to define
a set of keys.
keyset: array of Linux keycodes, one keycode per cell.
timeout-ms: duration keys must be pressed together in milliseconds before
generating a sysrq. If omitted the system is rebooted immediately when a valid
sequence has been recognized.
keyset = <0x03
timeout-ms = <3000>;
Would represent KEY_2, KEY_3 and KEY_9.