eae9d2ba - LinuxPPS: core support

Wed, 17 Jun 2009 23:28:37 +0000

LinuxPPS: core supportThis 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 whichprovides a high precision signal each second so that an application canuse it to adjust system clock time.Common use is the combination of the NTPD as userland program with a GPSreceiver as PPS source to obtain a wallclock-time with sub-millisecondsynchronisation to UTC.To obtain this goal the userland programs shoud use the PPS APIspecification (RFC 2783 - Pulse-Per-Second API for UNIX-like OperatingSystems, Version 1.0) which in part is implemented by this patch. Itprovides a set of chars devices, one per PPS source, which can be used toget the time signal. The RFC's functions can be implemented by accessingto these char devices.Signed-off-by: Rodolfo Giometti Cc: David Woodhouse Cc: Greg KH Cc: Randy Dunlap Cc: Kay Sievers Acked-by: Alan Cox Cc: Michael Kerrisk Cc: Christoph Hellwig Cc: Roman Zippel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds List of files: /linux-6.15/Documentation/ABI/testing/sysfs-pps

Changes in sysfs-pps

eae9d2ba - LinuxPPS: core support