drivers/pps/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # PPS support configuration
   4 #
   5
   6 menuconfig PPS
   7         tristate "PPS support"
   8         ---help---
   9           PPS (Pulse Per Second) is a special pulse provided by some GPS
  10           antennae. Userland can use it to get a high-precision time
  11           reference.
  12
  13           Some antennae's PPS signals are connected with the CD (Carrier
  14           Detect) pin of the serial line they use to communicate with the
  15           host. In this case use the SERIAL_LINE client support.
  16
  17           Some antennae's PPS signals are connected with some special host
  18           inputs so you have to enable the corresponding client support.
  19
  20           To compile this driver as a module, choose M here: the module
  21           will be called pps_core.ko.
  22
  23 if PPS
  24
  25 config PPS_DEBUG
  26         bool "PPS debugging messages"
  27         help
  28           Say Y here if you want the PPS support to produce a bunch of debug
  29           messages to the system log.  Select this if you are having a
  30           problem with PPS support and want to see more of what is going on.
  31
  32 config NTP_PPS
  33         bool "PPS kernel consumer support"
  34         depends on !NO_HZ_COMMON
  35         help
  36           This option adds support for direct in-kernel time
  37           synchronization using an external PPS signal.
  38
  39           It doesn't work on tickless systems at the moment.
  40
  41 source "drivers/pps/clients/Kconfig"
  42
  43 source "drivers/pps/generators/Kconfig"
  44
  45 endif # PPS