1ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only 2eae9d2baSRodolfo Giometti# 3eae9d2baSRodolfo Giometti# PPS support configuration 4eae9d2baSRodolfo Giometti# 5eae9d2baSRodolfo Giometti 698e959d4SVincent Legollmenuconfig PPS 7eae9d2baSRodolfo Giometti tristate "PPS support" 8*a7f7f624SMasahiro Yamada help 9eae9d2baSRodolfo Giometti PPS (Pulse Per Second) is a special pulse provided by some GPS 10eae9d2baSRodolfo Giometti antennae. Userland can use it to get a high-precision time 11eae9d2baSRodolfo Giometti reference. 12eae9d2baSRodolfo Giometti 13eae9d2baSRodolfo Giometti Some antennae's PPS signals are connected with the CD (Carrier 14eae9d2baSRodolfo Giometti Detect) pin of the serial line they use to communicate with the 15eae9d2baSRodolfo Giometti host. In this case use the SERIAL_LINE client support. 16eae9d2baSRodolfo Giometti 17eae9d2baSRodolfo Giometti Some antennae's PPS signals are connected with some special host 18eae9d2baSRodolfo Giometti inputs so you have to enable the corresponding client support. 19eae9d2baSRodolfo Giometti 20eae9d2baSRodolfo Giometti To compile this driver as a module, choose M here: the module 21eae9d2baSRodolfo Giometti will be called pps_core.ko. 22eae9d2baSRodolfo Giometti 23ab4f5260SRobert P. J. Dayif PPS 24ab4f5260SRobert P. J. Day 25eae9d2baSRodolfo Giometticonfig PPS_DEBUG 26eae9d2baSRodolfo Giometti bool "PPS debugging messages" 27eae9d2baSRodolfo Giometti help 28eae9d2baSRodolfo Giometti Say Y here if you want the PPS support to produce a bunch of debug 29eae9d2baSRodolfo Giometti messages to the system log. Select this if you are having a 30eae9d2baSRodolfo Giometti problem with PPS support and want to see more of what is going on. 31eae9d2baSRodolfo Giometti 32025b40abSAlexander Gordeevconfig NTP_PPS 33025b40abSAlexander Gordeev bool "PPS kernel consumer support" 34ab4f5260SRobert P. J. Day depends on !NO_HZ_COMMON 35025b40abSAlexander Gordeev help 36025b40abSAlexander Gordeev This option adds support for direct in-kernel time 3725985edcSLucas De Marchi synchronization using an external PPS signal. 38025b40abSAlexander Gordeev 39025b40abSAlexander Gordeev It doesn't work on tickless systems at the moment. 40025b40abSAlexander Gordeev 418636a1f9SMasahiro Yamadasource "drivers/pps/clients/Kconfig" 42697fb85fSRodolfo Giometti 438636a1f9SMasahiro Yamadasource "drivers/pps/generators/Kconfig" 44ab4f5260SRobert P. J. Day 45ab4f5260SRobert P. J. Dayendif # PPS 46