of: add of_mdio_find_device() api
Add a helper function which finds the mdio_device structure given a device tree node. This is helpful for finding the PCS device based on a DTS node but managing it as a mdio_device instead of a phy_device. Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk> Signed-off-by: NIoana Ciornei <ioana.ciornei@nxp.com> Reviewed-by: NAndrew Lunn <andrew@lunn.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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