2009-06-18 07:28:37 +08:00
|
|
|
#
|
|
|
|
|
# PPS support configuration
|
|
|
|
|
#
|
|
|
|
|
|
|
|
|
|
menu "PPS support"
|
|
|
|
|
|
|
|
|
|
config PPS
|
|
|
|
|
tristate "PPS support"
|
|
|
|
|
depends on EXPERIMENTAL
|
|
|
|
|
---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.
|
|
|
|
|
|
|
|
|
|
config PPS_DEBUG
|
|
|
|
|
bool "PPS debugging messages"
|
|
|
|
|
depends on PPS
|
|
|
|
|
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.
|
|
|
|
|
|
2011-01-13 09:00:56 +08:00
|
|
|
config NTP_PPS
|
|
|
|
|
bool "PPS kernel consumer support"
|
|
|
|
|
depends on PPS && !NO_HZ
|
|
|
|
|
help
|
|
|
|
|
This option adds support for direct in-kernel time
|
|
|
|
|
syncronization using an external PPS signal.
|
|
|
|
|
|
|
|
|
|
It doesn't work on tickless systems at the moment.
|
|
|
|
|
|
2010-03-11 07:23:45 +08:00
|
|
|
source drivers/pps/clients/Kconfig
|
|
|
|
|
|
2011-01-13 09:00:59 +08:00
|
|
|
source drivers/pps/generators/Kconfig
|
|
|
|
|
|
2009-06-18 07:28:37 +08:00
|
|
|
endmenu
|
