ptp: Add ioctl commands to expose raw cycle counter values

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Introduce two new ioctl commands, PTP_SYS_OFFSET_PRECISE_CYCLES and
PTP_SYS_OFFSET_EXTENDED_CYCLES, to allow user space to access the
raw free-running cycle counter from PTP devices.

These ioctls are variants of the existing PRECISE and EXTENDED
offset queries, but instead of returning device time in realtime,
they return the raw cycle counter value.

Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Link: https://patch.msgid.link/1755008228-88881-2-git-send-email-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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Carolina Jubran 2025-08-12 17:17:06 +03:00 • committed by Paolo Abeni

parent 9f0730b063

commit faf23f54d3

2 changed files with 30 additions and 8 deletions

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34

drivers/ptp/ptp_chardev.c

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4

include/uapi/linux/ptp_clock.h

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