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For PHY related DT information, refer to:
https://github.com/Xilinx/linux-xlnx/blob/master/Documentation/devicetree/bindings/net/phy.txt
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When selecting phy specific settings, make sure to mention interface type, speed (if limited/fixed) and phy address properties.
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DO NOT set compatible strings in ethernet PHY nodes. Ethernet phy devices are recognized based on identifier registers and phy address; it is not recommended to use compatible string.