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e755e49eb3
The switch may want to instantiate its own MDIO bus. Only do it centrally if the switch has not already created one, and the read op is implemented. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>