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ls1b_dwmac_syscon_init() was getting the stmmac iomem resource to detect which GMAC block is being used. Move this to a separate setup() function that only runs at probe time, so it can sensibly behave with an unrecognised resource adress. Use this to set a MAC index (id) which is then used in place of testing the base address. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Simon Horman <horms@kernel.org> Reviewed-by: Keguang Zhang <keguang.zhang@gmail.com> Tested-by: Keguang Zhang <keguang.zhang@gmail.com> # on LS1B & LS1C Link: https://patch.msgid.link/E1uRqEE-004c7M-Go@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>