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of: add of_mdio_find_device() api

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Add a helper function which finds the mdio_device structure given a
device tree node. This is helpful for finding the PCS device based on a
DTS node but managing it as a mdio_device instead of a phy_device.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2020-09-23 18:41:22 +03:00 committed by David S. Miller
parent e7e95c9003
commit b5b6775d72
2 changed files with 35 additions and 9 deletions
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38
drivers/of/of_mdio.c
View File

@ -337,6 +337,29 @@ unregister:
}
EXPORT_SYMBOL(of_mdiobus_register);
/**
* of_mdio_find_device - Given a device tree node, find the mdio_device
* @np: pointer to the mdio_device's device tree node
*
* If successful, returns a pointer to the mdio_device with the embedded
* struct device refcount incremented by one, or NULL on failure.
* The caller should call put_device() on the mdio_device after its use
*/
struct mdio_device *of_mdio_find_device(struct device_node *np)
{
struct device *d;
if (!np)
return NULL;
d = bus_find_device_by_of_node(&mdio_bus_type, np);
if (!d)
return NULL;
return to_mdio_device(d);
}
EXPORT_SYMBOL(of_mdio_find_device);
/**
* of_phy_find_device - Give a PHY node, find the phy_device
* @phy_np: Pointer to the phy's device tree node
@ -346,19 +369,16 @@ EXPORT_SYMBOL(of_mdiobus_register);
*/
struct phy_device *of_phy_find_device(struct device_node *phy_np)
{
struct device *d;
struct mdio_device *mdiodev;
if (!phy_np)
mdiodev = of_mdio_find_device(phy_np);
if (!mdiodev)
return NULL;
d = bus_find_device_by_of_node(&mdio_bus_type, phy_np);
if (d) {
mdiodev = to_mdio_device(d);
if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
return to_phy_device(d);
put_device(d);
}
if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
return to_phy_device(&mdiodev->dev);
put_device(&mdiodev->dev);
return NULL;
}

6
include/linux/of_mdio.h
View File

@ -17,6 +17,7 @@ bool of_mdiobus_child_is_phy(struct device_node *child);
int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np);
int devm_of_mdiobus_register(struct device *dev, struct mii_bus *mdio,
struct device_node *np);
struct mdio_device *of_mdio_find_device(struct device_node *np);
struct phy_device *of_phy_find_device(struct device_node *phy_np);
struct phy_device *
of_phy_connect(struct net_device *dev, struct device_node *phy_np,
@ -74,6 +75,11 @@ static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *
return mdiobus_register(mdio);
}
static inline struct mdio_device *of_mdio_find_device(struct device_node *np)
{
return NULL;
}
static inline struct phy_device *of_phy_find_device(struct device_node *phy_np)
{
return NULL;