1# 2# PPS support configuration 3# 4 5menu "PPS support" 6 7config 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 25config 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 33config 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 38 synchronization using an external PPS signal. 39 40 It doesn't work on tickless systems at the moment. 41 42source drivers/pps/clients/Kconfig 43 44source drivers/pps/generators/Kconfig 45 46endmenu 47