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