diff options
author | Russell King <rmk+kernel@armlinux.org.uk> | 2020-09-23 18:41:22 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2020-09-24 19:49:36 -0700 |
commit | b5b6775d72e8662b5ea7f892bf06db4831e2c1aa (patch) | |
tree | 1a26295076806814769f12e895aa033a1964443b | |
parent | e7e95c900338904536f7f7af98d467118909e5eb (diff) |
of: add of_mdio_find_device() api
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>
-rw-r--r-- | drivers/of/of_mdio.c | 38 | ||||
-rw-r--r-- | include/linux/of_mdio.h | 6 |
2 files changed, 35 insertions, 9 deletions
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c index cb32d7ef4938..4daf94bb56a5 100644 --- a/drivers/of/of_mdio.c +++ b/drivers/of/of_mdio.c @@ -338,6 +338,29 @@ 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; } diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h index 1efb88d9f892..cfe8c607a628 100644 --- a/include/linux/of_mdio.h +++ b/include/linux/of_mdio.h @@ -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; |