net: add comments to phy APIs
Added a comment on the limitations of phy_find_by_mask API when scanning MDIO buses with multiple PHYs present. Added short descriptions to the other APIs in phy.h for consistency. Signed-off-by: NAlex Marginean <alexm.osslist@gmail.com> Acked-by: NJoe Hershberger <joe.hershberger@ni.com> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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