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ptp: Add .getmaxphase callback to ptp_clock_info

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Enables advertisement of the maximum offset supported by the phase control
functionality of PHCs. The callback is used to return an error if an offset
not supported by the PHC is used in ADJ_OFFSET. The ioctls
PTP_CLOCK_GETCAPS and PTP_CLOCK_GETCAPS2 now advertise the maximum offset a
PHC's phase control functionality is capable of supporting. Introduce new
sysfs node, max_phase_adjustment.

Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Maciek Machnikowski <maciek@machnikowski.net>
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rahul Rameshbabu 2023-06-12 14:14:56 -07:00 • committed by David S. Miller
parent 3a9a9a6139
commit c3b60ab7a4
6 changed files with 31 additions and 4 deletions
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3
include/uapi/linux/ptp_clock.h
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@ -95,7 +95,8 @@ struct ptp_clock_caps {
int cross_timestamping;
/* Whether the clock supports adjust phase */
int adjust_phase;
int rsv[12]; /* Reserved for future use. */
int max_phase_adj; /* Maximum phase adjustment in nanoseconds. */
int rsv[11]; /* Reserved for future use. */
};
struct ptp_extts_request {