I'm new to kernel driver development and was wondering if it is possible to
obtain a PTP timestamp direct from the NIC's PHC within a kernel module? E.g.
timestamping an IRQ after a GPIO pin is triggered?
If we synchronize the system clock to a NIC PHC clock (e.g. phc2sys -s enp6s0
-m -O 0), in the kernel module calling getnstimeofday() looks like we get what
we need. I'd be curious if there is a more direct way to query the NIC PHC
clock from within the kernel module without relying on the system clock to be
synchronized using phc2sys?
Cheers,
Randy
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