net: phy: Add nested variants of mdiobus read/write
Since nested variants of mdiobus_read/write are used in multiple drivers, add nested variants in the mdiobus core. Suggested-by: NAndrew Lunn <andrew@lunn.ch> Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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