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net: phy: introduce phy_read_poll_timeout macro 

it is sometimes necessary to poll a phy register by phy_read()
function until its value satisfies some condition. introduce
phy_read_poll_timeout() macros that do this.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dejin Zheng 2020-03-23 23:05:57 +08:00 committed by David S. Miller
parent 8964a2174f
commit fcbd30d09b
1 changed files with 13 additions and 0 deletions
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13
include/linux/phy.h
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@ -717,6 +717,19 @@ static inline int phy_read(struct phy_device *phydev, u32 regnum)
return mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, regnum);
}
#define phy_read_poll_timeout(phydev, regnum, val, cond, sleep_us, \
timeout_us, sleep_before_read) \
({ \
int __ret = read_poll_timeout(phy_read, val, (cond) || val < 0, \
sleep_us, timeout_us, sleep_before_read, phydev, regnum); \
if (val < 0) \
__ret = val; \
if (__ret) \
phydev_err(phydev, "%s failed: %d\n", __func__, __ret); \
__ret; \
})
/**
* __phy_read - convenience function for reading a given PHY register
* @phydev: the phy_device struct