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TI's J721E SoC supports SGMII mode with the CPSW9G instance of the CPSW Ethernet Switch. Thus, enable it by adding SGMII mode to the list of the corresponding extra_modes member. Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com> Reviewed-by: Roger Quadros <rogerq@kernel.org> Link: https://lore.kernel.org/r/20230309063514.398705-4-s-vadapalli@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>