Commit 0ef44e5c authored by Antoine Tenart's avatar Antoine Tenart Committed by David S. Miller
Browse files

net: phy: add support for a common probe between shared PHYs 



Shared PHYs (PHYs in the same hardware package) may have shared
registers and their drivers would usually need to share information.
There is currently a way to have a shared (part of the) init, by using
phy_package_init_once(). This patch extends the logic to share parts of
the probe to allow sharing the initialization of locks or resources
retrieval.

Signed-off-by: default avatarAntoine Tenart <antoine.tenart@bootlin.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7b0cc34a

include/linux/phy.h

+15 −3
Original line number Diff line number Diff line
@@ -245,6 +245,7 @@ struct phy_package_shared { 


/* used as bit number in atomic bitops */

#define PHY_SHARED_F_INIT_DONE  0

#define PHY_SHARED_F_PROBE_DONE 1



/*

 * The Bus class for PHYs.  Devices which provide access to
@@ -1566,14 +1567,25 @@ static inline int __phy_package_write(struct phy_device *phydev, 
	return __mdiobus_write(phydev->mdio.bus, shared->addr, regnum, val);

}



static inline bool phy_package_init_once(struct phy_device *phydev)

static inline bool __phy_package_set_once(struct phy_device *phydev,

					  unsigned int b)

{

	struct phy_package_shared *shared = phydev->shared;



	if (!shared)

		return false;



	return !test_and_set_bit(PHY_SHARED_F_INIT_DONE, &shared->flags);

	return !test_and_set_bit(b, &shared->flags);

}



static inline bool phy_package_init_once(struct phy_device *phydev)

{

	return __phy_package_set_once(phydev, PHY_SHARED_F_INIT_DONE);

}



static inline bool phy_package_probe_once(struct phy_device *phydev)

{

	return __phy_package_set_once(phydev, PHY_SHARED_F_PROBE_DONE);

}



extern struct bus_type mdio_bus_type;