1# SPDX-License-Identifier: GPL-2.0-only
2#
3# PPS support configuration
4#
5
6menuconfig PPS
7	tristate "PPS support"
8	help
9	  PPS (Pulse Per Second) is a special pulse provided by some GPS
10	  antennae. Userland can use it to get a high-precision time
11	  reference.
12
13	  Some antennae's PPS signals are connected with the CD (Carrier
14	  Detect) pin of the serial line they use to communicate with the
15	  host. In this case use the SERIAL_LINE client support.
16
17	  Some antennae's PPS signals are connected with some special host
18	  inputs so you have to enable the corresponding client support.
19
20	  To compile this driver as a module, choose M here: the module
21	  will be called pps_core.ko.
22
23if PPS
24
25config PPS_DEBUG
26	bool "PPS debugging messages"
27	help
28	  Say Y here if you want the PPS support to produce a bunch of debug
29	  messages to the system log.  Select this if you are having a
30	  problem with PPS support and want to see more of what is going on.
31
32config NTP_PPS
33	bool "PPS kernel consumer support"
34	depends on !NO_HZ_COMMON
35	help
36	  This option adds support for direct in-kernel time
37	  synchronization using an external PPS signal.
38
39	  It doesn't work on tickless systems at the moment.
40
41source "drivers/pps/clients/Kconfig"
42
43source "drivers/pps/generators/Kconfig"
44
45endif # PPS
46