| Rodolfo Giometti | eae9d2b | 2009-06-17 16:28:37 -0700 | [diff] [blame] | 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 | |
| Alexander Gordeev | 025b40a | 2011-01-12 17:00:56 -0800 | [diff] [blame] | 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 |
| Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 38 | synchronization using an external PPS signal. |
| Alexander Gordeev | 025b40a | 2011-01-12 17:00:56 -0800 | [diff] [blame] | 39 | |
| 40 | It doesn't work on tickless systems at the moment. |
| 41 | |
| Rodolfo Giometti | 697fb85 | 2010-03-10 15:23:45 -0800 | [diff] [blame] | 42 | source drivers/pps/clients/Kconfig |
| 43 | |
| Alexander Gordeev | 46b402a | 2011-01-12 17:00:59 -0800 | [diff] [blame] | 44 | source drivers/pps/generators/Kconfig |
| 45 | |
| Rodolfo Giometti | eae9d2b | 2009-06-17 16:28:37 -0700 | [diff] [blame] | 46 | endmenu |