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net: of_mdio: add of_mdiobus_link_phydev()

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Add a function to walk the list of subnodes of a mdio bus and look for
a node that matches the phy's address with its 'reg' property. If found,
set the of_node pointer for the phy. This allows auto-probed pyh
devices to be augmented by information passed in via DT.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Mack 2014-05-24 09:34:26 +02:00 committed by David S. Miller
parent 8f8382888c
commit 86f6cf4127
3 changed files with 47 additions and 0 deletions
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6
drivers/net/phy/mdio_bus.c
View File

@ -300,6 +300,12 @@ struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
if (IS_ERR(phydev) || phydev == NULL)
return phydev;
/*
* For DT, see if the auto-probed phy has a correspoding child
* in the bus node, and set the of_node pointer in this case.
*/
of_mdiobus_link_phydev(bus, phydev);
err = phy_device_register(phydev);
if (err) {
phy_device_free(phydev);

33
drivers/of/of_mdio.c
View File

@ -183,6 +183,39 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
}
EXPORT_SYMBOL(of_mdiobus_register);
/**
* of_mdiobus_link_phydev - Find a device node for a phy
* @mdio: pointer to mii_bus structure
* @phydev: phydev for which the of_node pointer should be set
*
* Walk the list of subnodes of a mdio bus and look for a node that matches the
* phy's address with its 'reg' property. If found, set the of_node pointer for
* the phy. This allows auto-probed pyh devices to be supplied with information
* passed in via DT.
*/
void of_mdiobus_link_phydev(struct mii_bus *mdio,
struct phy_device *phydev)
{
struct device *dev = &phydev->dev;
struct device_node *child;
if (dev->of_node || !mdio->dev.of_node)
return;
for_each_available_child_of_node(mdio->dev.of_node, child) {
int addr;
addr = of_mdio_parse_addr(&mdio->dev, child);
if (addr < 0)
continue;
if (addr == phydev->addr) {
dev->of_node = child;
return;
}
}
}
/* Helper function for of_phy_find_device */
static int of_phy_match(struct device *dev, void *phy_np)
{

8
include/linux/of_mdio.h
View File

@ -25,6 +25,9 @@ struct phy_device *of_phy_attach(struct net_device *dev,
extern struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
extern void of_mdiobus_link_phydev(struct mii_bus *mdio,
struct phy_device *phydev);
#else /* CONFIG_OF */
static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
{
@ -60,6 +63,11 @@ static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
{
return NULL;
}
static inline void of_mdiobus_link_phydev(struct mii_bus *mdio,
struct phy_device *phydev)
{
}
#endif /* CONFIG_OF */
#if defined(CONFIG_OF) && defined(CONFIG_FIXED_PHY)