[ Upstream commit b097bea10215315e8ee17f88b4c1bbb521b1878c ] mdio drivers should not use REGCHACHE. Also disable locking since it's handled by the mdio users and regmap is always accessed atomically. Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>