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net: phy: add unlocked accessors

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Add unlocked versions of the bus accessors, which allows access to the
bus with all the tracing. These accessors validate that the bus mutex
is held, which is a basic requirement for all mii bus accesses.

Also added is a read-modify-write unlocked accessor with the same
locking requirements.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King
2018-01-02 10:58:37 +00:00
committed by David S. Miller
parent 1b2dea2e6a
commit 788f9933db
2 changed files with 53 additions and 0 deletions
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25
drivers/net/phy/phy-core.c
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@@ -323,3 +323,28 @@ int phy_write_mmd(struct phy_device *phydev, int devad, u32 regnum, u16 val)
return ret;
}
EXPORT_SYMBOL(phy_write_mmd);
/**
* __phy_modify() - Convenience function for modifying a PHY register
* @phydev: a pointer to a &struct phy_device
* @regnum: register number
* @mask: bit mask of bits to clear
* @set: bit mask of bits to set
*
* Unlocked helper function which allows a PHY register to be modified as
* new register value = (old register value & mask) | set
*/
int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
{
int ret, res;
ret = __phy_read(phydev, regnum);
if (ret >= 0) {
res = __phy_write(phydev, regnum, (ret & ~mask) | set);
if (res < 0)
ret = res;
}
return ret;
}
EXPORT_SYMBOL_GPL(__phy_modify);