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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>
This commit is contained in:
Carolina Jubran
2025-09-09 09:33:24 +02:00
committed by Paolo Abeni
parent 9f0730b063
commit faf23f54d3
2 changed files with 30 additions and 8 deletions
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include/uapi/linux/ptp_clock.h
+4
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@@ -245,6 +245,10 @@ struct ptp_pin_desc {
_IOWR(PTP_CLK_MAGIC, 18, struct ptp_sys_offset_extended)
#define PTP_MASK_CLEAR_ALL _IO(PTP_CLK_MAGIC, 19)
#define PTP_MASK_EN_SINGLE _IOW(PTP_CLK_MAGIC, 20, unsigned int)
#define PTP_SYS_OFFSET_PRECISE_CYCLES \
_IOWR(PTP_CLK_MAGIC, 21, struct ptp_sys_offset_precise)
#define PTP_SYS_OFFSET_EXTENDED_CYCLES \
_IOWR(PTP_CLK_MAGIC, 22, struct ptp_sys_offset_extended)
struct ptp_extts_event {
struct ptp_clock_time t; /* Time event occurred. */