Merge branch 'support-external-snapshots-on-dwmac1000'

Maxime Chevallier says:

====================
Support external snapshots on dwmac1000

The main change since v3 is the move of the fifo flush wait in the
ptp_clock_info enable() function within the mutex that protects the ptp
registers. Thanks Jakub and Paolo for spotting this.

This series also aggregates Daniel's reviews, except for the patch 4
which was modified since then.

This series is another take on the previous work [1] done by
Alexis Lothoré, that fixes the support for external snapshots
timestamping in GMAC3-based devices.

Details on why this is needed are mentionned on the cover [2] from V1.

[1]: https://lore.kernel.org/netdev/[email protected]/
[2]: https://lore.kernel.org/netdev/[email protected]/

Link to V1: https://lore.kernel.org/netdev/[email protected]/
Link to V2: https://lore.kernel.org/netdev/[email protected]/
Link to V3: https://lore.kernel.org/netdev/[email protected]/
====================

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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