Commit ce69e216 authored by Jeremy Linton's avatar Jeremy Linton Committed by David S. Miller

mdio_bus: Add generic mdio_find_bus()

It appears most ethernet drivers follow one of two main strategies
for mdio bus/phy management. A monolithic model where the net driver
itself creates, probes and uses the phy, and one where an external
mdio/phy driver instantiates the mdio bus/phy and the net driver
only attaches to a known phy. Usually in this latter model the phys
are discovered via DT relationships or simply phy name/address
hardcoding.

This is a shame because modern well behaved mdio buses are self
describing and can be probed. The mdio layer itself is fully capable
of this, yet there isn't a clean way for a standalone net driver
to attach and enumerate the discovered devices. This is because
outside of of_mdio_find_bus() there isn't a straightforward way
to acquire the mii_bus pointer.

So, lets add a mdio_find_bus which can return the mii_bus based
only on its name.
Signed-off-by: default avatarJeremy Linton <jeremy.linton@arm.com>
Acked-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cc5b48b5
......@@ -462,6 +462,23 @@ static struct class mdio_bus_class = {
.dev_groups = mdio_bus_groups,
};
/**
* mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
* @mdio_bus_np: Pointer to the mii_bus.
*
* Returns a reference to the mii_bus, or NULL if none found. The
* embedded struct device will have its reference count incremented,
* and this must be put_deviced'ed once the bus is finished with.
*/
struct mii_bus *mdio_find_bus(const char *mdio_name)
{
struct device *d;
d = class_find_device_by_name(&mdio_bus_class, mdio_name);
return d ? to_mii_bus(d) : NULL;
}
EXPORT_SYMBOL(mdio_find_bus);
#if IS_ENABLED(CONFIG_OF_MDIO)
/**
* of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
......
......@@ -289,6 +289,7 @@ static inline struct mii_bus *devm_mdiobus_alloc(struct device *dev)
return devm_mdiobus_alloc_size(dev, 0);
}
struct mii_bus *mdio_find_bus(const char *mdio_name);
void devm_mdiobus_free(struct device *dev, struct mii_bus *bus);
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
......
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