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Some drivers, e.g. stmmac, use the speed_up()/speed_down() APIs to gain additional power saving during Wake-on-LAN where the PHY is managing the state. Add support to phylink for this, which can be enabled by the MAC driver. Only change the PHY speed if the PHY is configured for wake-up, but without any wake-up on the MAC side, as MAC side means changing the configuration once the negotiation has completed. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Link: https://patch.msgid.link/E1vBrR7-0000000BLza-2PjK@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>