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Add helper which returns the MAC termination resistance value. Modifying the resistance to an appropriate value can reduce signal reflections and therefore improve signal quality. Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com> Link: https://patch.msgid.link/20250416-dp83822-mac-impedance-v3-3-028ac426cddb@liebherr.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>