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netdev/of/phy: New function: of_mdio_find_bus().

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Add of_mdio_find_bus() which allows an mii_bus to be located given its
associated the device tree node.

This is needed by the follow-on patch to add a driver for MDIO bus
multiplexers.

The of_mdiobus_register() function is modified so that the device tree
node is recorded in the mii_bus.  Then we can find it again by
iterating over all mdio_bus_class devices.

Because the OF device tree has now become an integral part of the
kernel, this can live in mdio_bus.c (which contains the needed
mdio_bus_class structure) instead of of_mdio.c.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Daney 2012-05-02 15:16:37 +00:00 committed by David S. Miller
parent 7dc2ce5f12
commit 2510602200
3 changed files with 36 additions and 0 deletions
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32
drivers/net/phy/mdio_bus.c
View File

@ -88,6 +88,38 @@ static struct class mdio_bus_class = {
.dev_release = mdiobus_release,
};
#ifdef CONFIG_OF_MDIO
/* Helper function for of_mdio_find_bus */
static int of_mdio_bus_match(struct device *dev, void *mdio_bus_np)
{
return dev->of_node == mdio_bus_np;
}
/**
* of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
* @mdio_np: Pointer to the mii_bus.
*
* Returns a pointer to the mii_bus, or NULL if none found.
*
* Because the association of a device_node and mii_bus is made via
* of_mdiobus_register(), the mii_bus cannot be found before it is
* registered with of_mdiobus_register().
*
*/
struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
{
struct device *d;
if (!mdio_bus_np)
return NULL;
d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np,
of_mdio_bus_match);
return d ? to_mii_bus(d) : NULL;
}
EXPORT_SYMBOL(of_mdio_find_bus);
#endif
/**
* mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
* @bus: target mii_bus

2
drivers/of/of_mdio.c
View File

@ -45,6 +45,8 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
for (i=0; i<PHY_MAX_ADDR; i++)
mdio->irq[i] = PHY_POLL;
mdio->dev.of_node = np;
/* Register the MDIO bus */
rc = mdiobus_register(mdio);
if (rc)

2
include/linux/of_mdio.h
View File

@ -22,4 +22,6 @@ extern struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
void (*hndlr)(struct net_device *),
phy_interface_t iface);
extern struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
#endif /* __LINUX_OF_MDIO_H */