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authorRussell King <rmk+kernel@armlinux.org.uk>2020-09-23 17:41:22 +0200
committerDavid S. Miller <davem@davemloft.net>2020-09-25 04:49:36 +0200
commitb5b6775d72e8662b5ea7f892bf06db4831e2c1aa (patch)
tree1a26295076806814769f12e895aa033a1964443b /drivers/of
parentnet: pcs-lynx: add support for 10GBASER (diff)
downloadlinux-b5b6775d72e8662b5ea7f892bf06db4831e2c1aa.tar.xz
linux-b5b6775d72e8662b5ea7f892bf06db4831e2c1aa.zip
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>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/of_mdio.c38
1 files changed, 29 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;
}