mdio_bus: Simplify reset handling and extend to non-DT systems
Convert mdiobus_register_reset() from open-coded DT-only optional reset handling to reset_control_get_optional_exclusive(). This not only simplifies the code, but also adds support for lookup-based resets on non-DT systems. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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