1# SPDX-License-Identifier: GPL-2.0-only 2# 3# PPS clients configuration 4# 5 6comment "PPS clients support" 7 8config PPS_CLIENT_KTIMER 9 tristate "Kernel timer client (Testing client, use for debug)" 10 help 11 If you say yes here you get support for a PPS debugging client 12 which uses a kernel timer to generate the PPS signal. 13 14 This driver can also be built as a module. If so, the module 15 will be called pps-ktimer. 16 17config PPS_CLIENT_LDISC 18 tristate "PPS line discipline" 19 depends on TTY 20 help 21 If you say yes here you get support for a PPS source connected 22 with the CD (Carrier Detect) pin of your serial port. 23 24config PPS_CLIENT_PARPORT 25 tristate "Parallel port PPS client" 26 depends on PARPORT 27 help 28 If you say yes here you get support for a PPS source connected 29 with the interrupt pin of your parallel port. 30 31config PPS_CLIENT_GPIO 32 tristate "PPS client using GPIO" 33 help 34 If you say yes here you get support for a PPS source using 35 GPIO. To be useful you must also register a platform device 36 specifying the GPIO pin and other options, usually in your board 37 setup. 38