net: phy: Introduce fwnode_mdio_find_device()

Define fwnode_mdio_find_device() to get a pointer to the
mdio_device from fwnode passed to the function.

Refactor of_mdio_find_device() to use fwnode_mdio_find_device().

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Acked-by: Grant Likely <grant.likely@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 495d86b4af7c..dca454b5c209 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2876,6 +2876,29 @@ static bool phy_drv_supports_irq(struct phy_driver *phydrv)
 }
 
 /**
+ * fwnode_mdio_find_device - Given a fwnode, find the mdio_device
+ * @fwnode: pointer to the mdio_device's fwnode
+ *
+ * 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 *fwnode_mdio_find_device(struct fwnode_handle *fwnode)
+{
+	struct device *d;
+
+	if (!fwnode)
+		return NULL;
+
+	d = bus_find_device_by_fwnode(&mdio_bus_type, fwnode);
+	if (!d)
+		return NULL;
+
+	return to_mdio_device(d);
+}
+EXPORT_SYMBOL(fwnode_mdio_find_device);
+
+/**
  * phy_probe - probe and init a PHY device
  * @dev: device to probe and init
  *