[RFC PATCH 0/2] ptp: add PTP_SYS_OFFSET_STAT ioctl, support it in virtio_rtc

[Peter Hilber]

This RFC patch series proposes a new ioctl PTP_SYS_OFFSET_STAT and adds
support for it in the proposed virtio_rtc driver [1]. The new
PTP_SYS_OFFSET_STAT ioctl provides a cross-timestamp like
PTP_SYS_OFFSET_PRECISE2, plus any the following status information (for
now):

- for UTC timescale clocks: leap second related status,

- clock accuracy.

The second commit adds support for the ioctl in the proposed virtio_rtc
driver, and hence depends on the patch series "Add virtio_rtc module" [1].

[1] https://lore.kernel.org/lkml/20241219201118.2233-1-quic_philber@xxxxxxxxxxx/T/#t

Signed-off-by: Peter Hilber <quic_philber@xxxxxxxxxxx>


Peter Hilber (2):
  ptp: add PTP_SYS_OFFSET_STAT for xtstamping with status
  virtio_rtc: Support PTP_SYS_OFFSET_STAT ioctl

 drivers/ptp/ptp_chardev.c             |  39 ++++++++
 drivers/ptp/ptp_clock.c               |   9 ++
 drivers/virtio/Kconfig                |   4 +-
 drivers/virtio/virtio_rtc_driver.c    | 122 +++++++++++++++++++++++-
 drivers/virtio/virtio_rtc_internal.h  |   3 +-
 drivers/virtio/virtio_rtc_ptp.c       |  25 +++--
 include/linux/ptp_clock_kernel.h      |  31 ++++++
 include/uapi/linux/ptp_clock.h        | 130 +++++++++++++++++++++++++-
 tools/testing/selftests/ptp/Makefile  |   2 +-
 tools/testing/selftests/ptp/testptp.c | 126 ++++++++++++++++++++++++-
 10 files changed, 471 insertions(+), 20 deletions(-)


base-commit: 8a8009abbfa04e58f1b01b20534cac9e8fe61a46
-- 
2.43.0