openwrt/target/linux/atheros/patches-3.3/220-enet_micrel_workaround.patch

--- a/drivers/net/ethernet/ar231x/ar231x.c
+++ b/drivers/net/ethernet/ar231x/ar231x.c
@@ -151,6 +151,7 @@ static int ar231x_mdiobus_write(struct m
 static int ar231x_mdiobus_reset(struct mii_bus *bus);
 static int ar231x_mdiobus_probe (struct net_device *dev);
 static void ar231x_adjust_link(struct net_device *dev);
+static bool no_phy = false;
 
 #ifndef ERR
 #define ERR(fmt, args...) printk("%s: " fmt, __func__, ##args)
@@ -300,6 +301,21 @@ int __devinit ar231x_probe(struct platfo
 
 	mdiobus_register(sp->mii_bus);
 
+	/* Workaround for Micrel switch, which is only available on
+	 * one PHY and cannot be configured through MDIO */
+	if (!no_phy) {
+		u32 phy_id = 0;
+		get_phy_id(sp->mii_bus, 1, &phy_id);
+		if (phy_id == 0x00221450)
+			no_phy = true;
+	}
+	if (no_phy) {
+		sp->link = 1;
+		netif_carrier_on(dev);
+		return 0;
+	}
+	no_phy = true;
+
 	if (ar231x_mdiobus_probe(dev) != 0) {
 		printk(KERN_ERR "%s: mdiobus_probe failed\n", dev->name);
 		rx_tasklet_cleanup(dev);
@@ -356,8 +372,10 @@ static int __devexit ar231x_remove(struc
 	rx_tasklet_cleanup(dev);
 	ar231x_init_cleanup(dev);
 	unregister_netdev(dev);
-	mdiobus_unregister(sp->mii_bus);
-	mdiobus_free(sp->mii_bus);
+	if (sp->mii_bus) {
+		mdiobus_unregister(sp->mii_bus);
+		mdiobus_free(sp->mii_bus);
+	}
 	kfree(dev);
 	return 0;
 }
@@ -1133,6 +1151,9 @@ static int ar231x_ioctl(struct net_devic
 	struct ar231x_private *sp = netdev_priv(dev);
 	int ret;
 
+	if (!sp->phy_dev)
+		return -ENODEV;
+
 	switch (cmd) {
 
 	case SIOCETHTOOL: