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Add support for the PCS to specify which interfaces it supports, which can be used by MAC drivers to build the main supported_interfaces bitmap. Phylink also validates that the PCS returned by the MAC driver supports the interface that the MAC was asked for. An empty supported_interfaces bitmap from the PCS indicates that it does not provide this information, and we handle that appropriately. Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Link: https://patch.msgid.link/E1tTffL-007RoD-1Y@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>