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phylink_get_fixed_state() currently consults an optional "link_gpio" GPIO descriptor, expand this mechanism to allow specifying a custom callback. This is necessary to support out of band link notifcation (e.g: from an interrupt within a MMIO register). Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>