Merge branch 'hns3-ptp'

Guangbin Huang says:

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net: hns3: add support for PTP

This series adds PTP support for the HNS3 ethernet driver.

change log:
V1 -> V2:
1. use spinlock to prevent concurrency
2. add the handling when ptp_clock_register() returns NULL
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Signed-off-by: David S. Miller <davem@davemloft.net>