net: phy: dp83867: Add documentation for optional impedance control
Add documention of ti,min-output-impedance and ti,max-output-impedance which can be used to correct MAC impedance mismatch using phy extended registers. Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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