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Commit 25106022 authored by David Daney's avatar David Daney Committed by David S. Miller
Browse files

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



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: default avatarDavid Daney <david.daney@cavium.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7dc2ce5f

drivers/net/phy/mdio_bus.c

+32 −0
Original line number Diff line number Diff line
@@ -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

drivers/of/of_mdio.c

+2 −0
Original line number Diff line number Diff line
@@ -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)

include/linux/of_mdio.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */