Jacob Keller cd875625b4 ptp: document behavior of PTP_STRICT_FLAGS ... Commit 6138e687c7 ("ptp: Introduce strict checking of external time stamp options.") added the PTP_STRICT_FLAGS to the set of flags supported for the external timestamp request ioctl. It is only supported by PTP_EXTTS_REQUEST2, as it was introduced the introduction of the new ioctls. Further, the kernel has always set this flag for PTP_EXTTS_REQUEST2 regardless of whether or not the user requested the behavior. This effectively means that the flag is not useful for userspace. If the user issues a PTP_EXTTS_REQUEST ioctl, the flag is ignored due to not being supported on the old ioctl. If the user issues a PTP_EXTTS_REQUEST2 ioctl, the flag will be set by the kernel regardless of whether the user set the flag in their structure. Add a comment documenting this behavior in the uAPI header file. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev> Acked-by: Richard Cochran <richardcochran@gmail.com> Reviewed-by: Kory Maincent <kory.maincent@bootlin.com> Tested-by: James Clark <jjc@jclark.com> Link: https://patch.msgid.link/20250918-jk-fix-bcm-phy-supported-flags-v1-3-747b60407c9c@intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2025-09-22 11:36:30 -07:00
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uapi	ptp: document behavior of PTP_STRICT_FLAGS	2025-09-22 11:36:30 -07:00
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