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Tip revision: e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd authored by Linus Torvalds on 06 May 2019, 00:42:58 UTC
Linux 5.1
Linux 5.1
Tip revision: e93c9c9
Kconfig
#
# 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