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net: mdio: add mdiobus_modify_changed()

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Add mdiobus_modify_changed() helper to reflect the phylib and similar
equivalents. This will avoid this functionality being open-coded, as
has already happened in phylink, and it looks like other users will be
appearing soon.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle)
2021-10-06 13:19:20 +01:00
committed by Jakub Kicinski
parent 4c82708299
commit 79365f36d1
2 changed files with 24 additions and 0 deletions
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22
drivers/net/phy/mdio_bus.c
View File

@@ -926,6 +926,28 @@ int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)
}
EXPORT_SYMBOL_GPL(mdiobus_modify);
/**
* mdiobus_modify_changed - Convenience function for modifying a given mdio
* device register and returning if it changed
* @bus: the mii_bus struct
* @addr: the phy address
* @regnum: register number to write
* @mask: bit mask of bits to clear
* @set: bit mask of bits to set
*/
int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
u16 mask, u16 set)
{
int err;
mutex_lock(&bus->mdio_lock);
err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);
mutex_unlock(&bus->mdio_lock);
return err;
}
EXPORT_SYMBOL_GPL(mdiobus_modify_changed);
/**
* mdio_bus_match - determine if given MDIO driver supports the given
* MDIO device

2
include/linux/mdio.h
View File

@@ -349,6 +349,8 @@ int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,
u16 set);
int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
u16 mask, u16 set);
static inline u32 mdiobus_c45_addr(int devad, u16 regnum)
{