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[ Upstream commit2160428bcb] For 1000BASE-X or SGMII interface mode, the PCS also need to be selected. Only return null pointer when there is a copper NIC with external PHY. Fixes:02b2a6f91b("net: txgbe: support copper NIC with external PHY") Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com> Link: https://patch.msgid.link/20241115073508.1130046-1-jiawenwu@trustnetic.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>