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 22if PPS 23 24config PPS_DEBUG 25 bool "PPS debugging messages" 26 help 27 Say Y here if you want the PPS support to produce a bunch of debug 28 messages to the system log. Select this if you are having a 29 problem with PPS support and want to see more of what is going on. 30 31config NTP_PPS 32 bool "PPS kernel consumer support" 33 depends on !NO_HZ_COMMON 34 help 35 This option adds support for direct in-kernel time 36 synchronization using an external PPS signal. 37 38 It doesn't work on tickless systems at the moment. 39 40source "drivers/pps/clients/Kconfig" 41 42source "drivers/pps/generators/Kconfig" 43 44endif # PPS 45