| # |
| # PPS support configuration |
| # |
| |
| menuconfig PPS |
| tristate "PPS support" |
| ---help--- |
| PPS (Pulse Per Second) is a special pulse provided by some GPS |
| antennae. Userland can use it to get a high-precision time |
| reference. |
| |
| Some antennae's PPS signals are connected with the CD (Carrier |
| Detect) pin of the serial line they use to communicate with the |
| host. In this case use the SERIAL_LINE client support. |
| |
| Some antennae's PPS signals are connected with some special host |
| inputs so you have to enable the corresponding client support. |
| |
| To compile this driver as a module, choose M here: the module |
| will be called pps_core.ko. |
| |
| if PPS |
| |
| config PPS_DEBUG |
| bool "PPS debugging messages" |
| help |
| Say Y here if you want the PPS support to produce a bunch of debug |
| messages to the system log. Select this if you are having a |
| problem with PPS support and want to see more of what is going on. |
| |
| config NTP_PPS |
| bool "PPS kernel consumer support" |
| depends on !NO_HZ_COMMON |
| help |
| This option adds support for direct in-kernel time |
| synchronization using an external PPS signal. |
| |
| It doesn't work on tickless systems at the moment. |
| |
| source drivers/pps/clients/Kconfig |
| |
| source drivers/pps/generators/Kconfig |
| |
| endif # PPS |
