fm-eth: Add ability for board code to disable a port

The SoC configuration may have more ports enabled than a given board
actually can utilize.  Add a routinue that allows the board code to
disable a port that it knows isn't being used.

fm_disable_port() needs to be called before cpu_eth_init().

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

drivers/net/fm/init.c

@@ -123,6 +123,14 @@ void fman_enet_init(void)
 	return ;
 }
 
+void fm_disable_port(enum fm_port port)
+{
+	int i = fm_port_to_index(port);
+
+	fm_info[i].enabled = 0;
+	fman_disable_port(port);
+}
+
 void fm_info_set_mdio(enum fm_port port, struct mii_dev *bus)
 {
 	int i = fm_port_to_index(port);