net: mdiobus: Introduce fwnode_mdiobus_register_phy()

Introduce fwnode_mdiobus_register_phy() to register PHYs on the
mdiobus. From the compatible string, identify whether the PHY is
c45 and based on this create a PHY device instance which is
registered on the mdiobus.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>

drivers/net/phy/mdio_bus.c

@@ -106,6 +106,46 @@ int mdiobus_unregister_device(struct mdio_device *mdiodev)
 }
 EXPORT_SYMBOL(mdiobus_unregister_device);
 
+int fwnode_mdiobus_register_phy(struct mii_bus *bus,
+				struct fwnode_handle *child, u32 addr)
+{
+	struct phy_device *phy;
+	bool is_c45;
+	const char *cp;
+	u32 phy_id;
+	int rc;
+
+	rc = fwnode_property_read_string(child, "compatible", &cp);
+	is_c45 = !(rc || strcmp(cp, "ethernet-phy-ieee802.3-c45"));
+
+	if (is_c45 || fwnode_get_phy_id(child, &phy_id))
+		phy = get_phy_device(bus, addr, is_c45);
+	else
+		phy = phy_device_create(bus, addr, phy_id, 0, NULL);
+	if (IS_ERR(phy))
+		return PTR_ERR(phy);
+
+	phy->irq = bus->irq[addr];
+
+	/* Associate the fwnode with the device structure so it
+	 * can be looked up later.
+	 */
+	phy->mdio.dev.fwnode = child;
+
+	/* All data is now stored in the phy struct, so register it */
+	rc = phy_device_register(phy);
+	if (rc) {
+		phy_device_free(phy);
+		fwnode_handle_put(phy->mdio.dev.fwnode);
+		return rc;
+	}
+
+	dev_dbg(&bus->dev, "registered phy at address %i\n", addr);
+
+	return 0;
+}
+EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
+
 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
 {
 	struct mdio_device *mdiodev = bus->mdio_map[addr];

include/linux/mdio.h

@@ -368,6 +368,8 @@ int mdiobus_register_device(struct mdio_device *mdiodev);
 int mdiobus_unregister_device(struct mdio_device *mdiodev);
 bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
 struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);
+int fwnode_mdiobus_register_phy(struct mii_bus *bus,
+				      struct fwnode_handle *child, u32 addr);
 
 /**
  * mdio_module_driver() - Helper macro for registering mdio drivers