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2019-06-14docs: pps.txt: convert to ReST and rename to pps.rstMauro Carvalho Chehab1-239/+0
This file is already in a good shape: just its title and adding some literal block markups is needed for it to be part of the document. While it has a small chapter with sysfs stuff, most of the document is focused on driver development. As it describes a kernel API, move it to the driver-api directory. In order to avoid conflicts, let's add an :orphan: tag to it, to be removed when added to the driver-api book. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Acked-by: Rodolfo Giometti <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
2017-09-08drivers/pps: aesthetic tweaks to PPS-related contentRobert P. J. Day1-21/+23
Collection of aesthetic adjustments to various PPS-related files, directories and Documentation, some quite minor just for the sake of consistency, including: * Updated example of pps device tree node (courtesy Rodolfo G.) * "PPS-API" -> "PPS API" * "pps_source_info_s" -> "pps_source_info" * "ktimer driver" -> "pps-ktimer driver" * "ppstest /dev/pps0" -> "ppstest /dev/pps1" to match example * Add missing PPS-related entries to MAINTAINERS file * Other trivialities Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Robert P. J. Day <[email protected]> Acked-by: Rodolfo Giometti <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2017-01-04Doc: clarify source of jitter in USB1.1, and USB2.0Sanjeev1-2/+5
Even though the jitter due to USB1.1 may be 1ms, NTP can reduce its effect significantly. And USB2.0 reduces this anyway. Signed-off-by: Sanjeev Gupta <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
2017-01-04Doc: Typos in documentationSanjeev1-2/+2
No semantic changes. The next patch in this series will do the actual changes to sync with NTP current best practices Signed-off-by: Sanjeev Gupta <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
2017-01-04Doc: Correct PPS doc to reflect code locationSanjeev1-3/+4
timepps.h , as well as PPS sample test utilities, are no longer in the kernel tree. Update documentation to point to new locations. Signed-off-by: Sanjeev Gupta <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
2016-04-28Documentation: pps: fix spelling mistakeEric Engestrom1-1/+1
Signed-off-by: Eric Engestrom <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
2015-07-14Doc: pps: Fix file name in pps.txtMasanari Iida1-1/+1
This patch fix a file name of example code. Signed-off-by: Masanari Iida <[email protected]> Acked-by: Rodolfo Giometti <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
2015-06-22Doc:pps: Fix typo in pps.txtMasanari Iida1-1/+1
This patch fix a spelling typo in Documentation/pps/pps.txt Signed-off-by: Masanari Iida <[email protected]> Acked-by: Rodolfo Giometti <[email protected]> [jc: did s/into/in the/ on the same line while we were there] Signed-off-by: Jonathan Corbet <[email protected]>
2013-09-26USB: serial: invoke dcd_change ldisc's handler.Paul Chavent1-0/+15
The DCD pin of the serial port can receive a PPS signal. By calling the port line discipline dcd handle, this patch allow to monitor PPS through USB serial devices. However the performance aren't as good as the uart drivers, so document this point too. Signed-off-by: Paul Chavent <[email protected]> Acked-by: Rodolfo Giometti <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
2011-01-13pps: add parallel port PPS signal generatorAlexander Gordeev1-0/+46
Add PPS signal generator which utilizes STROBE pin of a parallel port to send PPS signals. It uses parport abstraction layer and hrtimers to precisely control the signal. [[email protected]: fix build] Signed-off-by: Alexander Gordeev <[email protected]> Acked-by: Rodolfo Giometti <[email protected]> Cc: john stultz <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2009-06-18LinuxPPS: core supportRodolfo Giometti1-0/+172
This patch adds the kernel side of the PPS support currently named "LinuxPPS". PPS means "pulse per second" and a PPS source is just a device which provides a high precision signal each second so that an application can use it to adjust system clock time. Common use is the combination of the NTPD as userland program with a GPS receiver as PPS source to obtain a wallclock-time with sub-millisecond synchronisation to UTC. To obtain this goal the userland programs shoud use the PPS API specification (RFC 2783 - Pulse-Per-Second API for UNIX-like Operating Systems, Version 1.0) which in part is implemented by this patch. It provides a set of chars devices, one per PPS source, which can be used to get the time signal. The RFC's functions can be implemented by accessing to these char devices. Signed-off-by: Rodolfo Giometti <[email protected]> Cc: David Woodhouse <[email protected]> Cc: Greg KH <[email protected]> Cc: Randy Dunlap <[email protected]> Cc: Kay Sievers <[email protected]> Acked-by: Alan Cox <[email protected]> Cc: Michael Kerrisk <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Roman Zippel <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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