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A lot of modern SoC have the ability to store MAC addresses in their NVMEM. So extend the generic function device_get_mac_address() to obtain the MAC address from an nvmem cell named 'mac-address' in case there is no firmware node which contains the MAC address directly. Signed-off-by: Stefan Wahren <wahrenst@gmx.net> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://patch.msgid.link/20250912140332.35395-3-wahrenst@gmx.net Signed-off-by: Jakub Kicinski <kuba@kernel.org>