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