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This patch adds fix_mac_speed() support for Altera socfpga Ethernet controller. Emac splitter is a soft IP core in FPGA system that converts GMII interface from Synopsys mac to RGMII/SGMII interface. This splitter core is an optional IP if user would like to use RGMII/SGMII interface in their system. Software needs to update a register in splitter core when there is speed change. Signed-off-by: Ley Foon Tan <lftan@altera.com> Signed-off-by: David S. Miller <davem@davemloft.net>