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stmmac: add the support for PTP hw clock driver
This patch implements PHC (ptp hardware clock) driver for stmmac driver to support 1588 PTP. V2: added support for FINE method, reduced loop delay and review spinlock. Signed-off-by: Rayagond Kokatanur <rayagond@vayavyalabs.com> Hacked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Cc: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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