From b5b6775d72e8662b5ea7f892bf06db4831e2c1aa Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 23 Sep 2020 18:41:22 +0300 Subject: 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 Signed-off-by: Ioana Ciornei Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller --- drivers/of/of_mdio.c | 38 +++++++++++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 9 deletions(-) (limited to 'drivers/of') 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 @@ -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; } -- cgit v1.2.3