bfin_mac: offer a PTP Hardware Clock.
The BF518 has a PTP time unit that works in a similar way to other MAC based clocks, like gianfar, ixp46x, and igb. This patch adds support for using the blackfin as a PHC. Although the blackfin hardware does offer a few ancillary features, this patch implements only the basic operations. Compile tested only. Signed-off-by: NRichard Cochran <richardcochran@gmail.com> Tested-by: NBob Liu <lliubbo@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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