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it is sometimes necessary to poll a phy register by phy_read_mmd() function until its value satisfies some condition. introduce phy_read_mmd_poll_timeout() macros that do this. Suggested-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>