projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| eae9d2ba RG |
2 | # |
| 3 | # PPS support configuration | |
| 4 | # | |
| 5 | ||
| 98e959d4 | 6 | menuconfig PPS |
| eae9d2ba | 7 | tristate "PPS support" |
| a7f7f624 | 8 | help |
| eae9d2ba RG |
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 | ||
| ab4f5260 RD |
23 | if PPS |
| 24 | ||
| eae9d2ba RG |
25 | config PPS_DEBUG |
| 26 | bool "PPS debugging messages" | |
| eae9d2ba RG |
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 | ||
| 025b40ab AG |
32 | config NTP_PPS |
| 33 | bool "PPS kernel consumer support" | |
| ab4f5260 | 34 | depends on !NO_HZ_COMMON |
| 025b40ab AG |
35 | help |
| 36 | This option adds support for direct in-kernel time | |
| 25985edc | 37 | synchronization using an external PPS signal. |
| 025b40ab AG |
38 | |
| 39 | It doesn't work on tickless systems at the moment. | |
| 40 | ||
| 8636a1f9 | 41 | source "drivers/pps/clients/Kconfig" |
| 697fb85f | 42 | |
| 8636a1f9 | 43 | source "drivers/pps/generators/Kconfig" |
| ab4f5260 RD |
44 | |
| 45 | endif # PPS |