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Subject[PATCH net-next 1/8] net: phy: add support for a common probe between shared PHYs
Date
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>
---
include/linux/phy.h | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 8c05d0fb5c00..058219b6441f 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -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
@@ -1554,14 +1555,25 @@ 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;
--
2.26.2
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