phy: add phy_find_by_mask/phy_connect_dev

It is useful to be able to try a range of
possible phy addresses to connect.

Also, an ethernet device is not required
to use phy_find_by_mask leading to better
separation of mii vs ethernet, as suggested
by Andy Fleming.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

drivers/net/phy/phy.c

@@ -31,6 +31,7 @@
 #include <miiphy.h>
 #include <phy.h>
 #include <errno.h>
+#include <linux/err.h>
 
 /* Generic PHY support and helper functions */
 
@@ -574,6 +575,61 @@ static int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
 	return 0;
 }
 
+static struct phy_device *create_phy_by_mask(struct mii_dev *bus,
+		unsigned phy_mask, int devad, phy_interface_t interface)
+{
+	u32 phy_id = 0xffffffff;
+	while (phy_mask) {
+		int addr = ffs(phy_mask) - 1;
+		int r = get_phy_id(bus, addr, devad, &phy_id);
+		if (r < 0)
+			return ERR_PTR(r);
+		/* If the PHY ID is mostly f's, we didn't find anything */
+		if ((phy_id & 0x1fffffff) != 0x1fffffff)
+			return phy_device_create(bus, addr, phy_id, interface);
+		phy_mask &= ~(1 << addr);
+	}
+	return NULL;
+}
+
+static struct phy_device *search_for_existing_phy(struct mii_dev *bus,
+		unsigned phy_mask, phy_interface_t interface)
+{
+	/* If we have one, return the existing device, with new interface */
+	while (phy_mask) {
+		int addr = ffs(phy_mask) - 1;
+		if (bus->phymap[addr]) {
+			bus->phymap[addr]->interface = interface;
+			return bus->phymap[addr];
+		}
+		phy_mask &= ~(1 << addr);
+	}
+	return NULL;
+}
+
+static struct phy_device *get_phy_device_by_mask(struct mii_dev *bus,
+		unsigned phy_mask, phy_interface_t interface)
+{
+	int i;
+	struct phy_device *phydev;
+
+	phydev = search_for_existing_phy(bus, phy_mask, interface);
+	if (phydev)
+		return phydev;
+	/* Try Standard (ie Clause 22) access */
+	/* Otherwise we have to try Clause 45 */
+	for (i = 0; i < 5; i++) {
+		phydev = create_phy_by_mask(bus, phy_mask,
+				i ? i : MDIO_DEVAD_NONE, interface);
+		if (IS_ERR(phydev))
+			return NULL;
+		if (phydev)
+			return phydev;
+	}
+	printf("Phy not found\n");
+	return phy_device_create(bus, ffs(phy_mask) - 1, 0xffffffff, interface);
+}
+
 /**
  * get_phy_device - reads the specified PHY device and returns its @phy_device struct
  * @bus: the target MII bus
@@ -585,38 +641,7 @@ static int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
 static struct phy_device *get_phy_device(struct mii_dev *bus, int addr,
 					 phy_interface_t interface)
 {
-	u32 phy_id = 0x1fffffff;
-	int i;
-	int r;
-
-	/* If we have one, return the existing device, with new interface */
-	if (bus->phymap[addr]) {
-		bus->phymap[addr]->interface = interface;
-
-		return bus->phymap[addr];
-	}
-
-	/* Try Standard (ie Clause 22) access */
-	r = get_phy_id(bus, addr, MDIO_DEVAD_NONE, &phy_id);
-	if (r)
-		return NULL;
-
-	/* If the PHY ID is mostly f's, we didn't find anything */
-	if ((phy_id & 0x1fffffff) != 0x1fffffff)
-		return phy_device_create(bus, addr, phy_id, interface);
-
-	/* Otherwise we have to try Clause 45 */
-	for (i = 1; i < 5; i++) {
-		r = get_phy_id(bus, addr, i, &phy_id);
-		if (r)
-			return NULL;
-
-		/* If the phy_id is mostly Fs, there is no device there */
-		if ((phy_id & 0x1fffffff) != 0x1fffffff)
-			break;
-	}
-
-	return phy_device_create(bus, addr, phy_id, interface);
+	return get_phy_device_by_mask(bus, 1 << addr, interface);
 }
 
 int phy_reset(struct phy_device *phydev)
@@ -689,38 +714,41 @@ int miiphy_reset(const char *devname, unsigned char addr)
 	return phy_reset(phydev);
 }
 
-struct phy_device *phy_connect(struct mii_dev *bus, int addr,
-				struct eth_device *dev,
-				phy_interface_t interface)
+struct phy_device *phy_find_by_mask(struct mii_dev *bus, unsigned phy_mask,
+		phy_interface_t interface)
 {
-	struct phy_device *phydev;
-
 	/* Reset the bus */
 	if (bus->reset)
 		bus->reset(bus);
 
 	/* Wait 15ms to make sure the PHY has come out of hard reset */
 	udelay(15000);
+	return get_phy_device_by_mask(bus, phy_mask, interface);
+}
 
-	phydev = get_phy_device(bus, addr, interface);
-
-	if (!phydev) {
-		printf("Could not get PHY for %s:%d\n", bus->name, addr);
-
-		return NULL;
-	}
-
+void phy_connect_dev(struct phy_device *phydev, struct eth_device *dev)
+{
 	/* Soft Reset the PHY */
 	phy_reset(phydev);
-
-	if (phydev->dev)
+	if (phydev->dev) {
 		printf("%s:%d is connected to %s.  Reconnecting to %s\n",
-			bus->name, addr, phydev->dev->name, dev->name);
-
+				phydev->bus->name, phydev->addr,
+				phydev->dev->name, dev->name);
+	}
 	phydev->dev = dev;
-
 	debug("%s connected to %s\n", dev->name, phydev->drv->name);
+}
+
+struct phy_device *phy_connect(struct mii_dev *bus, int addr,
+		struct eth_device *dev, phy_interface_t interface)
+{
+	struct phy_device *phydev;
 
+	phydev = phy_find_by_mask(bus, 1 << addr, interface);
+	if (phydev)
+		phy_connect_dev(phydev, dev);
+	else
+		printf("Could not get PHY for %s: addr %d\n", bus->name, addr);
 	return phydev;
 }
 

include/phy.h

@@ -199,6 +199,9 @@ static inline int is_10g_interface(phy_interface_t interface)
 
 int phy_init(void);
 int phy_reset(struct phy_device *phydev);
+struct phy_device *phy_find_by_mask(struct mii_dev *bus, unsigned phy_mask,
+		phy_interface_t interface);
+void phy_connect_dev(struct phy_device *phydev, struct eth_device *dev);
 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
 				struct eth_device *dev,
 				phy_interface_t interface);