On Thu, Mar 15, 2018 at 03:08:41PM -0400, A wrote:
> I've got a Xilinx ZCU102 with a macb driver from xilinx's 2017.3 branch
> which has 4.9 linux kernel and PTP support).

Their vendor kernel is, well, "different".  Their mainline MAC drivers
are also of questionable quality.  Good luck.

> I've also found other variables online in various places that I felt need
> to be set for this board:
> 
> CONFIG_DP83640_PHY (because it has this PHY onboard, the TI DP83640)

If you want PHY time stamping, then you must disable the PHC in the
MAC (if there is one).

HTH,
Richard

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