wpan-phy: follow usual patter of devices registration

Follow the usual pattern of devices registration by adding new function
(wpan_phy_set_dev) that sets child->parent relationship and removing
parent argument from wpan_phy_register call.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

drivers/ieee802154/fakehard.c

@@ -372,11 +372,12 @@ static int __devinit ieee802154fake_probe(struct platform_device *pdev)
 			goto out;
 	}
 
+	wpan_phy_set_dev(phy, &pdev->dev);
 	SET_NETDEV_DEV(dev, &phy->dev);
 
 	platform_set_drvdata(pdev, dev);
 
-	err = wpan_phy_register(&pdev->dev, phy);
+	err = wpan_phy_register(phy);
 	if (err)
 		goto out;
 

include/net/wpan-phy.h

@@ -45,7 +45,11 @@ struct wpan_phy {
 };
 
 struct wpan_phy *wpan_phy_alloc(size_t priv_size);
-int wpan_phy_register(struct device *parent, struct wpan_phy *phy);
+static inline void wpan_phy_set_dev(struct wpan_phy *phy, struct device *dev)
+{
+	phy->dev.parent = dev;
+}
+int wpan_phy_register(struct wpan_phy *phy);
 void wpan_phy_unregister(struct wpan_phy *phy);
 void wpan_phy_free(struct wpan_phy *phy);
 /* Same semantics as for class_for_each_device */

net/ieee802154/wpan-class.c

@@ -168,10 +168,8 @@ struct wpan_phy *wpan_phy_alloc(size_t priv_size)
 }
 EXPORT_SYMBOL(wpan_phy_alloc);
 
-int wpan_phy_register(struct device *parent, struct wpan_phy *phy)
+int wpan_phy_register(struct wpan_phy *phy)
 {
-	phy->dev.parent = parent;
-
 	return device_add(&phy->dev);
 }
 EXPORT_SYMBOL(wpan_phy_register);