dt-bindings: net: add pcs-handle attribute
Document the new pcs-handle attribute to support connecting to an external PHY. For Xilinx's AXI Ethernet, this is used when the core operates in SGMII or 1000Base-X modes and links through the internal PCS/PMA PHY. Signed-off-by: Andy Chiu <andy.chiu@sifive.com> Reviewed-by: Greentime Hu <greentime.hu@sifive.com> Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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