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There are 4 MDIO bus controllers in AST2600 SOC. Each of them can connect to one or more PHY chips and is flexible to work with the 4 MAC devices in AST2600. On AST2600 EVB, MDIO 0,1,2,3 connect to the PHY chips used by MAC 0,1,2,3 respectively. Signed-off-by: Dylan Hung <dylan_hung@aspeedtech.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com>