[RFC,net-next,13/24] phy: Add API for {un{registering an mdio device to a bus.

diff --git a/drivers/net/ethernet/broadcom/b44.c b/drivers/net/ethernet/broadcom/b44.c
index 15f3ccaef8b7..abc0fb76f28a 100644
--- a/drivers/net/ethernet/broadcom/b44.c
+++ b/drivers/net/ethernet/broadcom/b44.c
@@ -2272,7 +2272,7 @@  static int b44_register_phy_one(struct b44 *bp)
 		goto err_out_mdiobus;
 	}
 
-	if (!bp->mii_bus->phy_map[bp->phy_addr] &&
+	if (!mdiobus_is_registered_device(bp->mii_bus, bp->phy_addr) &&
 	    (sprom->boardflags_lo & (B44_BOARDFLAG_ROBO | B44_BOARDFLAG_ADM))) {
 
 		dev_info(sdev->dev,
diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 633b59db813a..0d775964b060 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -573,7 +573,7 @@  static int bcmgenet_mii_pd_init(struct bcmgenet_priv *priv)
 		}
 
 		if (pd->phy_address >= 0 && pd->phy_address < PHY_MAX_ADDR)
-			phydev = mdio->phy_map[pd->phy_address];
+			phydev = mdiobus_get_phy(mdio, pd->phy_address);
 		else
 			phydev = phy_find_first(mdio);
 
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 5d659a5c86b5..aaa5064672ac 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -1406,7 +1406,7 @@  static void tg3_mdio_config_5785(struct tg3 *tp)
 	u32 val;
 	struct phy_device *phydev;
 
-	phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+	phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 	switch (phydev->drv->phy_id & phydev->drv->phy_id_mask) {
 	case PHY_ID_BCM50610:
 	case PHY_ID_BCM50610M:
@@ -1554,7 +1554,7 @@  static int tg3_mdio_init(struct tg3 *tp)
 		return i;
 	}
 
-	phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+	phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 
 	if (!phydev || !phydev->drv) {
 		dev_warn(&tp->pdev->dev, "No PHY devices\n");
@@ -1964,7 +1964,7 @@  static void tg3_setup_flow_control(struct tg3 *tp, u32 lcladv, u32 rmtadv)
 	u32 old_tx_mode = tp->tx_mode;
 
 	if (tg3_flag(tp, USE_PHYLIB))
-		autoneg = tp->mdio_bus->phy_map[tp->phy_addr]->autoneg;
+		autoneg = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr)->autoneg;
 	else
 		autoneg = tp->link_config.autoneg;
 
@@ -2000,7 +2000,7 @@  static void tg3_adjust_link(struct net_device *dev)
 	u8 oldflowctrl, linkmesg = 0;
 	u32 mac_mode, lcl_adv, rmt_adv;
 	struct tg3 *tp = netdev_priv(dev);
-	struct phy_device *phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+	struct phy_device *phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 
 	spin_lock_bh(&tp->lock);
 
@@ -2089,7 +2089,7 @@  static int tg3_phy_init(struct tg3 *tp)
 	/* Bring the PHY back to a known state. */
 	tg3_bmcr_reset(tp);
 
-	phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+	phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 
 	/* Attach the MAC to the PHY. */
 	phydev = phy_connect(tp->dev, phydev_name(phydev),
@@ -2116,7 +2116,7 @@  static int tg3_phy_init(struct tg3 *tp)
 				      SUPPORTED_Asym_Pause);
 		break;
 	default:
-		phy_disconnect(tp->mdio_bus->phy_map[tp->phy_addr]);
+		phy_disconnect(mdiobus_get_phy(tp->mdio_bus, tp->phy_addr));
 		return -EINVAL;
 	}
 
@@ -2134,7 +2134,7 @@  static void tg3_phy_start(struct tg3 *tp)
 	if (!(tp->phy_flags & TG3_PHYFLG_IS_CONNECTED))
 		return;
 
-	phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+	phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 
 	if (tp->phy_flags & TG3_PHYFLG_IS_LOW_POWER) {
 		tp->phy_flags &= ~TG3_PHYFLG_IS_LOW_POWER;
@@ -2154,13 +2154,13 @@  static void tg3_phy_stop(struct tg3 *tp)
 	if (!(tp->phy_flags & TG3_PHYFLG_IS_CONNECTED))
 		return;
 
-	phy_stop(tp->mdio_bus->phy_map[tp->phy_addr]);
+	phy_stop(mdiobus_get_phy(tp->mdio_bus, tp->phy_addr));
 }
 
 static void tg3_phy_fini(struct tg3 *tp)
 {
 	if (tp->phy_flags & TG3_PHYFLG_IS_CONNECTED) {
-		phy_disconnect(tp->mdio_bus->phy_map[tp->phy_addr]);
+		phy_disconnect(mdiobus_get_phy(tp->mdio_bus, tp->phy_addr));
 		tp->phy_flags &= ~TG3_PHYFLG_IS_CONNECTED;
 	}
 }
@@ -4044,7 +4044,7 @@  static int tg3_power_down_prepare(struct tg3 *tp)
 			struct phy_device *phydev;
 			u32 phyid, advertising;
 
-			phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+			phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 
 			tp->phy_flags |= TG3_PHYFLG_IS_LOW_POWER;
 
@@ -12072,7 +12072,7 @@  static int tg3_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 		struct phy_device *phydev;
 		if (!(tp->phy_flags & TG3_PHYFLG_IS_CONNECTED))
 			return -EAGAIN;
-		phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+		phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 		return phy_ethtool_gset(phydev, cmd);
 	}
 
@@ -12139,7 +12139,7 @@  static int tg3_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 		struct phy_device *phydev;
 		if (!(tp->phy_flags & TG3_PHYFLG_IS_CONNECTED))
 			return -EAGAIN;
-		phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+		phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 		return phy_ethtool_sset(phydev, cmd);
 	}
 
@@ -12294,7 +12294,7 @@  static int tg3_nway_reset(struct net_device *dev)
 	if (tg3_flag(tp, USE_PHYLIB)) {
 		if (!(tp->phy_flags & TG3_PHYFLG_IS_CONNECTED))
 			return -EAGAIN;
-		r = phy_start_aneg(tp->mdio_bus->phy_map[tp->phy_addr]);
+		r = phy_start_aneg(mdiobus_get_phy(tp->mdio_bus, tp->phy_addr));
 	} else {
 		u32 bmcr;
 
@@ -12412,7 +12412,7 @@  static int tg3_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam
 		u32 newadv;
 		struct phy_device *phydev;
 
-		phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+		phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 
 		if (!(phydev->supported & SUPPORTED_Pause) ||
 		    (!(phydev->supported & SUPPORTED_Asym_Pause) &&
@@ -13922,7 +13922,7 @@  static int tg3_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 		struct phy_device *phydev;
 		if (!(tp->phy_flags & TG3_PHYFLG_IS_CONNECTED))
 			return -EAGAIN;
-		phydev = tp->mdio_bus->phy_map[tp->phy_addr];
+		phydev = mdiobus_get_phy(tp->mdio_bus, tp->phy_addr);
 		return phy_mii_ioctl(phydev, ifr, cmd);
 	}
 
diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
index c028b299ab3f..62fa136554ac 100644
--- a/drivers/net/ethernet/ethoc.c
+++ b/drivers/net/ethernet/ethoc.c
@@ -678,7 +678,7 @@  static int ethoc_mdio_probe(struct net_device *dev)
 	int err;
 
 	if (priv->phy_id != -1)
-		phy = priv->mdio->phy_map[priv->phy_id];
+		phy = mdiobus_get_phy(priv->mdio, priv->phy_id);
 	else
 		phy = phy_find_first(priv->mdio);
 
@@ -766,7 +766,7 @@  static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 		if (mdio->phy_id >= PHY_MAX_ADDR)
 			return -ERANGE;
 
-		phy = priv->mdio->phy_map[mdio->phy_id];
+		phy = mdiobus_get_phy(priv->mdio, mdio->phy_id);
 		if (!phy)
 			return -ENODEV;
 	} else {
diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 8f3f2cf0dcbf..bb116ad646f6 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -839,7 +839,7 @@  static int ftgmac100_mii_probe(struct ftgmac100 *priv)
 
 	/* search for connect PHY device */
 	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		struct phy_device *tmp = priv->mii_bus->phy_map[i];
+		struct phy_device *tmp = mdiobus_get_phy(priv->mii_bus, i);
 
 		if (tmp) {
 			phydev = tmp;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 351ee6e1e438..dd710a8478ff 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -48,6 +48,7 @@ 
 #include <linux/irq.h>
 #include <linux/clk.h>
 #include <linux/platform_device.h>
+#include <linux/mdio.h>
 #include <linux/phy.h>
 #include <linux/fec.h>
 #include <linux/of.h>
@@ -1926,11 +1927,7 @@  static int fec_enet_mii_probe(struct net_device *ndev)
 	} else {
 		/* check for attached phy */
 		for (phy_id = 0; (phy_id < PHY_MAX_ADDR); phy_id++) {
-			if ((fep->mii_bus->phy_mask & (1 << phy_id)))
-				continue;
-			if (fep->mii_bus->phy_map[phy_id] == NULL)
-				continue;
-			if (fep->mii_bus->phy_map[phy_id]->phy_id == 0)
+			if (!mdiobus_is_registered_device(fep->mii_bus, phy_id))
 				continue;
 			if (dev_id--)
 				continue;
diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_mdio.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_mdio.c
index 5b13b8c11bef..467ff7033606 100644
--- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_mdio.c
+++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_mdio.c
@@ -180,7 +180,7 @@  int sxgbe_mdio_register(struct net_device *ndev)
 	}
 
 	for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
-		struct phy_device *phy = mdio_bus->phy_map[phy_addr];
+		struct phy_device *phy = mdiobus_get_phy(mdio_bus, phy_addr);
 
 		if (phy) {
 			char irq_num[4];
diff --git a/drivers/net/ethernet/smsc/smsc9420.c b/drivers/net/ethernet/smsc/smsc9420.c
index a7fa004a28a6..d5650a1bd7c7 100644
--- a/drivers/net/ethernet/smsc/smsc9420.c
+++ b/drivers/net/ethernet/smsc/smsc9420.c
@@ -1157,8 +1157,9 @@  static int smsc9420_mii_probe(struct net_device *dev)
 
 	BUG_ON(pd->phy_dev);
 
+	phydev = mdiobus_get_phy(pd->mii_bus, 1);
 	/* Device only supports internal PHY at address 1 */
-	if (!pd->mii_bus->phy_map[1]) {
+	if (!phydev) {
 		netdev_err(dev, "no PHY found at address 1\n");
 		return -ENODEV;
 	}
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index f0990eb9460f..bff28595b427 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -252,7 +252,7 @@  int stmmac_mdio_register(struct net_device *ndev)
 
 	found = 0;
 	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
-		struct phy_device *phydev = new_bus->phy_map[addr];
+		struct phy_device *phydev = mdiobus_get_phy(new_bus, addr);
 		if (phydev) {
 			int act = 0;
 			char irq_num[4];
diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 78299c1592c1..4e7c9b9b042a 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -393,7 +393,7 @@  static int davinci_mdio_probe(struct platform_device *pdev)
 
 	/* scan and dump the bus */
 	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
-		phy = data->bus->phy_map[addr];
+		phy = mdiobus_get_phy(data->bus, addr);
 		if (phy) {
 			dev_info(dev, "phy[%d]: device %s, driver %s\n",
 				 phy->mdio.addr, phydev_name(phy),
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index e5b1ccde835b..f28f89e109ba 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -38,6 +38,48 @@ 
 
 #include <asm/irq.h>
 
+int mdiobus_register_device(struct mdio_device *mdiodev)
+{
+	if (mdiodev->bus->mdio_map[mdiodev->addr])
+		return -EBUSY;
+
+	mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;
+
+	return 0;
+}
+EXPORT_SYMBOL(mdiobus_register_device);
+
+int mdiobus_unregister_device(struct mdio_device *mdiodev)
+{
+	if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)
+		return -EINVAL;
+
+	mdiodev->bus->mdio_map[mdiodev->addr] = NULL;
+
+	return 0;
+}
+EXPORT_SYMBOL(mdiobus_unregister_device);
+
+struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
+{
+	struct mdio_device *mdiodev = bus->mdio_map[addr];
+
+	if (!mdiodev)
+		return NULL;
+
+	if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))
+		return NULL;
+
+	return container_of(mdiodev, struct phy_device, mdio);
+}
+EXPORT_SYMBOL(mdiobus_get_phy);
+
+bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)
+{
+	return bus->mdio_map[addr];
+}
+EXPORT_SYMBOL(mdiobus_is_registered_device);
+
 /**
  * mdiobus_alloc_size - allocate a mii_bus structure
  * @size: extra amount of memory to allocate for private storage.
@@ -299,7 +341,7 @@  int __mdiobus_register(struct mii_bus *bus, struct module *owner)
 
 error:
 	while (--i >= 0) {
-		struct phy_device *phydev = bus->phy_map[i];
+		struct phy_device *phydev = mdiobus_get_phy(bus, i);
 		if (phydev) {
 			phy_device_remove(phydev);
 			phy_device_free(phydev);
@@ -318,7 +360,7 @@  void mdiobus_unregister(struct mii_bus *bus)
 	bus->state = MDIOBUS_UNREGISTERED;
 
 	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		struct phy_device *phydev = bus->phy_map[i];
+		struct phy_device *phydev = mdiobus_get_phy(bus, i);
 		if (phydev) {
 			phy_device_remove(phydev);
 			phy_device_free(phydev);
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index f16de04b65b6..37fc8d6269ec 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -166,6 +166,7 @@  struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 	mdiodev->dev.bus = &mdio_bus_type;
 	mdiodev->bus = bus;
 	mdiodev->addr = addr;
+	mdiodev->flags = MDIO_DEVICE_FLAG_PHY;
 
 	dev->speed = 0;
 	dev->duplex = -1;
@@ -383,10 +384,9 @@  int phy_device_register(struct phy_device *phydev)
 {
 	int err;
 
-	/* Don't register a phy if one is already registered at this address */
-	if (phydev->mdio.bus->phy_map[phydev->mdio.addr])
-		return -EINVAL;
-	phydev->mdio.bus->phy_map[phydev->mdio.addr] = phydev;
+	err = mdiobus_register_device(&phydev->mdio);
+	if (err)
+		return err;
 
 	/* Run all of the fixups for this PHY */
 	err = phy_scan_fixups(phydev);
@@ -404,7 +404,7 @@  int phy_device_register(struct phy_device *phydev)
 	return 0;
 
  out:
-	phydev->mdio.bus->phy_map[phydev->mdio.addr] = NULL;
+	mdiobus_unregister_device(&phydev->mdio);
 	return err;
 }
 EXPORT_SYMBOL(phy_device_register);
@@ -419,11 +419,8 @@  EXPORT_SYMBOL(phy_device_register);
  */
 void phy_device_remove(struct phy_device *phydev)
 {
-	struct mii_bus *bus = phydev->mdio.bus;
-	int addr = phydev->mdio.addr;
-
 	device_del(&phydev->mdio.dev);
-	bus->phy_map[addr] = NULL;
+	mdiobus_unregister_device(&phydev->mdio);
 }
 EXPORT_SYMBOL(phy_device_remove);
 
@@ -433,11 +430,13 @@  EXPORT_SYMBOL(phy_device_remove);
  */
 struct phy_device *phy_find_first(struct mii_bus *bus)
 {
+	struct phy_device *phydev;
 	int addr;
 
 	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
-		if (bus->phy_map[addr])
-			return bus->phy_map[addr];
+		phydev = mdiobus_get_phy(bus, addr);
+		if (phydev)
+			return phydev;
 	}
 	return NULL;
 }
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 75a415d7cf8c..2c0430208fe3 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -194,7 +194,7 @@  int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 
 		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
 			/* skip already registered PHYs */
-			if (mdio->phy_map[addr])
+			if (mdiobus_is_registered_device(mdio, addr))
 				continue;
 
 			/* be noisy to encourage people to set reg property */
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index 94f9f1491cde..8cd9579e18ea 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -19,9 +19,12 @@  struct mdio_device {
 	struct mii_bus *bus;
 	/* Bus address of the MDIO device (0-31) */
 	int addr;
+	int flags;
 };
 #define to_mdio_device(d) container_of(d, struct mdio_device, dev)
 
+#define MDIO_DEVICE_FLAG_PHY		1
+
 static inline bool mdio_phy_id_is_c45(int phy_id)
 {
 	return (phy_id & MDIO_PHY_ID_C45) && !(phy_id & ~MDIO_PHY_ID_C45_MASK);
@@ -188,4 +191,9 @@  int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
 int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 
+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);
+
 #endif /* __LINUX_MDIO_H__ */
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 46e725be6730..7dc5f7b9d066 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -179,7 +179,7 @@  struct mii_bus {
 	struct device dev;
 
 	/* list of all PHYs on bus */
-	struct phy_device *phy_map[PHY_MAX_ADDR];
+	struct mdio_device *mdio_map[PHY_MAX_ADDR];
 
 	/* PHY addresses to be ignored when probing */
 	u32 phy_mask;
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index ee1114613847..68fae0cf17cd 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -15,6 +15,7 @@ 
 #include <linux/phy_fixed.h>
 #include <linux/of_net.h>
 #include <linux/of_mdio.h>
+#include <linux/mdio.h>
 #include <net/rtnetlink.h>
 #include <net/switchdev.h>
 #include <linux/if_bridge.h>
@@ -997,7 +998,7 @@  static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
 {
 	struct dsa_switch *ds = p->parent;
 
-	p->phy = ds->slave_mii_bus->phy_map[addr];
+	p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
 	if (!p->phy) {
 		netdev_err(slave_dev, "no phy at %d\n", addr);
 		return -ENODEV;