phylib: Add of_phy_attach

10G PHYs don't currently support running the state machine, which
is implicitly setup via of_phy_connect(). Therefore, it is necessary
to implement an OF version of phy_attach(), which does everything
except start the state machine.

Signed-off-by: Andy Fleming <[e-mail]>
Signed-off-by: Shaohui Xie <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/of/of_mdio.c

···
 	return IS_ERR(phy) ? NULL : phy;
 }
 EXPORT_SYMBOL(of_phy_connect_fixed_link);
+
+/**
+ * of_phy_attach - Attach to a PHY without starting the state machine
+ * @dev: pointer to net_device claiming the phy
+ * @phy_np: Node pointer for the PHY
+ * @flags: flags to pass to the PHY
+ * @iface: PHY data interface type
+ */
+struct phy_device *of_phy_attach(struct net_device *dev,
+				 struct device_node *phy_np, u32 flags,
+				 phy_interface_t iface)
+{
+	struct phy_device *phy = of_phy_find_device(phy_np);
+
+	if (!phy)
+		return NULL;
+
+	return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy;
+}
+EXPORT_SYMBOL(of_phy_attach);

include/linux/of_mdio.h

···
 					 struct device_node *phy_np,
 					 void (*hndlr)(struct net_device *),
 					 u32 flags, phy_interface_t iface);
+struct phy_device *of_phy_attach(struct net_device *dev,
+				 struct device_node *phy_np, u32 flags,
+				 phy_interface_t iface);
 extern struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
 					 void (*hndlr)(struct net_device *),
 					 phy_interface_t iface);
···
 						struct device_node *phy_np,
 						void (*hndlr)(struct net_device *),
 						u32 flags, phy_interface_t iface)
+{
+	return NULL;
+}
+
+static inline struct phy_device *of_phy_attach(struct net_device *dev,
+					       struct device_node *phy_np,
+					       u32 flags, phy_interface_t iface)
 {
 	return NULL;
 }