net: stmmac: implement the SIOCGHWTSTAMP ioctl
This patch adds support for the SIOCGHWTSTAMP ioctl which enables user processes to read the current hwtstamp_config settings non-destructively. Signed-off-by: Artem Panfilov <panfilov.artyom@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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