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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: Antoine Tenart <antoine.tenart@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Antoine Tenart 2020-06-23 16:30:07 +02:00 committed by David S. Miller
parent 7b0cc34ac4
commit 0ef44e5cab
1 changed files with 15 additions and 3 deletions
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18
include/linux/phy.h
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@ -244,7 +244,8 @@ struct phy_package_shared {
};
/* used as bit number in atomic bitops */
#define PHY_SHARED_F_INIT_DONE 0
#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;