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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 <[email protected]>
Cc: Grant Likely <[email protected]>
Cc: "David S. Miller" <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David Daney 2012-05-02 15:16:37 +00:00 • committed by David S. Miller
commit 2510602200
3 changed files with 36 additions and 0 deletions
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drivers/of/of_mdio.c
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@ -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)