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DWMAC4 is capable to support clause 45 mdio communication. This patch enable the feature on stmmac_mdio_write() and stmmac_mdio_read() by following phy_write_mmd() and phy_read_mmd() mdiobus read write implementation format. Reviewed-by: Li, Yifan <yifan2.li@intel.com> Signed-off-by: Kweh Hock Leong <hock.leong.kweh@intel.com> Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com> Signed-off-by: Voon Weifeng <weifeng.voon@intel.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>