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eae9d2ba RG |
1 | # |
2 | # PPS support configuration | |
3 | # | |
4 | ||
5 | menu "PPS support" | |
6 | ||
7 | config PPS | |
8 | tristate "PPS support" | |
9 | depends on EXPERIMENTAL | |
10 | ---help--- | |
11 | PPS (Pulse Per Second) is a special pulse provided by some GPS | |
12 | antennae. Userland can use it to get a high-precision time | |
13 | reference. | |
14 | ||
15 | Some antennae's PPS signals are connected with the CD (Carrier | |
16 | Detect) pin of the serial line they use to communicate with the | |
17 | host. In this case use the SERIAL_LINE client support. | |
18 | ||
19 | Some antennae's PPS signals are connected with some special host | |
20 | inputs so you have to enable the corresponding client support. | |
21 | ||
22 | To compile this driver as a module, choose M here: the module | |
23 | will be called pps_core.ko. | |
24 | ||
25 | config PPS_DEBUG | |
26 | bool "PPS debugging messages" | |
27 | depends on PPS | |
28 | help | |
29 | Say Y here if you want the PPS support to produce a bunch of debug | |
30 | messages to the system log. Select this if you are having a | |
31 | problem with PPS support and want to see more of what is going on. | |
32 | ||
025b40ab AG |
33 | config NTP_PPS |
34 | bool "PPS kernel consumer support" | |
35 | depends on PPS && !NO_HZ | |
36 | help | |
37 | This option adds support for direct in-kernel time | |
25985edc | 38 | synchronization using an external PPS signal. |
025b40ab AG |
39 | |
40 | It doesn't work on tickless systems at the moment. | |
41 | ||
697fb85f RG |
42 | source drivers/pps/clients/Kconfig |
43 | ||
46b402a0 AG |
44 | source drivers/pps/generators/Kconfig |
45 | ||
eae9d2ba | 46 | endmenu |