net: ethernet: stmmac: update MDIO support for GMAC4
On new GMAC4 IP, MAC_MDIO_address register has been updated, and bitmaps changed. This patch takes into account those changes. Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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