22 Sep, 2016
1 commit
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Drivers must be ready to accept NULL from ptp_clock_register() if the
PTP clock subsystem is configured out.This patch documents that and ensures that all drivers cope well
with a NULL return.Signed-off-by: Nicolas Pitre
Reviewed-by: Eugenia Emantayev
Acked-by: Richard Cochran
Acked-by: Edward Cree
Signed-off-by: David S. Miller
04 Mar, 2016
1 commit
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Currently, network /system cross-timestamping is performed in the
PTP_SYS_OFFSET ioctl. The PTP clock driver reads gettimeofday() and
the gettime64() callback provided by the driver. The cross-timestamp
is best effort where the latency between the capture of system time
(getnstimeofday()) and the device time (driver callback) may be
significant.The getcrosststamp() callback and corresponding PTP_SYS_OFFSET_PRECISE
ioctl allows the driver to perform this device/system correlation when
for example cross timestamp hardware is available. Modern Intel
systems can do this for onboard Ethernet controllers using the ART
counter. There is virtually zero latency between captures of the ART
and network device clock.The capabilities ioctl (PTP_CLOCK_GETCAPS), is augmented allowing
applications to query whether or not drivers implement the
getcrosststamp callback, providing more precise cross timestamping.Cc: Prarit Bhargava
Cc: Richard Cochran
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: Andy Lutomirski
Cc: kevin.b.stanton@intel.com
Cc: kevin.j.clarke@intel.com
Cc: hpa@zytor.com
Cc: jeffrey.t.kirsher@intel.com
Cc: netdev@vger.kernel.org
Acked-by: Richard Cochran
Signed-off-by: Christopher S. Hall
[jstultz: Commit subject tweaks]
Signed-off-by: John Stultz
01 Apr, 2015
2 commits
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All of the PHC drivers have been converted to the new methods. This patch
converts the three remaining callers within the core code and removes the
older methods for good. As a result, the core PHC code is ready for the
year 2038. However, some of the PHC drivers are not quite ready yet.Signed-off-by: Richard Cochran
Signed-off-by: David S. Miller -
Converting the PHC drivers over to the new methods is one step along the
way to making them ready for 2038. Once all the drivers are up to date,
then the old methods will be removed.Signed-off-by: Richard Cochran
Signed-off-by: David S. Miller
22 Mar, 2014
1 commit
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This patch adds a pair of new ioctls to the PTP Hardware Clock device
interface. Using the ioctls, user space programs can query each pin to
find out its current function and also reprogram a different function
if desired.Signed-off-by: Richard Cochran
Signed-off-by: David S. Miller
04 Nov, 2012
1 commit
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This patch updates the adjfreq callback description to include a note that the
delta in ppb is always relative to the base frequency, and not to the current
frequency of the hardware clock.Signed-off-by: Jacob Keller
CC: stable@vger.kernel.org [v3.5+]
CC: Richard Cochran
CC: John Stultz
Signed-off-by: Jeff Kirsher
Signed-off-by: David S. Miller
23 Sep, 2012
2 commits
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There has been some confusion among PHC driver authors about the
intended purpose of the clock_name attribute. This patch expands the
documation in order to clarify how the clock_name field should be
understood.Signed-off-by: Richard Cochran
Signed-off-by: David S. Miller -
PTP Hardware Clock devices appear as class devices in sysfs. This patch
changes the registration API to use the parent device, clarifying the
clock's relationship to the underlying device.Signed-off-by: Richard Cochran
Acked-by: Ben Hutchings
Acked-by: Jeff Kirsher
Signed-off-by: David S. Miller
08 Sep, 2012
1 commit
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Initial version by Stuart Hodgson
Some PHC device drivers may deliver PPS events with a significant
and variable delay, but still be able to measure precisely what
that delay is.Add a pps_sub_ts() function for subtracting a delay from the
timestamp(s) in a PPS event, and a PTP event type (PTP_CLOCK_PPSUSR)
for which the caller provides a complete PPS event.Signed-off-by: Ben Hutchings
04 Apr, 2012
1 commit
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This commit adds a method that MAC drivers may call in order to find out
the device number of their associated PTP Hardware Clock.Signed-off-by: Richard Cochran
Signed-off-by: David S. Miller
24 May, 2011
1 commit
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This patch adds an infrastructure for hardware clocks that implement
IEEE 1588, the Precision Time Protocol (PTP). A class driver offers a
registration method to particular hardware clock drivers. Each clock is
presented as a standard POSIX clock.The ancillary clock features are exposed in two different ways, via
the sysfs and by a character device.Signed-off-by: Richard Cochran
Acked-by: Arnd Bergmann
Acked-by: David S. Miller
Signed-off-by: John Stultz