net: dsa: mv88e6xxx: change serdes lane parameter type from u8 type to int
Returning 0 is no more an error case with MV88E6393 family which has serdes lane numbers 0, 9 or 10. So with this change .serdes_get_lane will return lane number or -errno (-ENODEV or -EOPNOTSUPP). Signed-off-by: NPavana Sharma <pavana.sharma@digi.com> Reviewed-by: NAndrew Lunn <andrew@lunn.ch> Reviewed-by: NVladimir Oltean <olteanv@gmail.com> Signed-off-by: NMarek Behún <kabel@kernel.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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