[deliverable/linux.git] / Documentation / devicetree / bindings / input / input-reset.txt

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.

Required property:
sysrq-reset-seq: array of Linux keycodes, one keycode per cell.

Optional property:
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.

Example:

 chosen {
                linux,sysrq-reset-seq {
                        keyset = <0x03
                                  0x04
                                  0x0a>;
                        timeout-ms = <3000>;
                };
         };

Would represent KEY_2, KEY_3 and KEY_9.
Commit	Line	Data
4c076eb0 MP	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.