Merge branch 'net-phy-add-iterator-mdiobus_for_each_phy'

Heiner Kallweit says:

====================
net: phy: add iterator mdiobus_for_each_phy

Add and use an iterator for all PHY's on a MII bus, and phy_find_next()
as a prerequisite.
====================

Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/freescale/fec_main.c

···
 	int err = -ENXIO;
 	u32 mii_speed, holdtime;
 	u32 bus_freq;
-	int addr;
 
 	/*
 	 * The i.MX28 dual fec interfaces are not equal.
···
 	of_node_put(node);
 
 	/* find all the PHY devices on the bus and set mac_managed_pm to true */
-	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
-		phydev = mdiobus_get_phy(fep->mii_bus, addr);
-		if (phydev)
-			phydev->mac_managed_pm = true;
-	}
+	mdiobus_for_each_phy(fep->mii_bus, phydev)
+		phydev->mac_managed_pm = true;
 
 	mii_cnt++;
 

drivers/net/ethernet/ti/davinci_mdio.c

···
 	struct davinci_mdio_data *data;
 	struct resource *res;
 	struct phy_device *phy;
-	int ret, addr;
 	int autosuspend_delay_ms = -1;
+	int ret;
 
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
···
 		goto bail_out;
 
 	/* scan and dump the bus */
-	for (addr = 0; addr < PHY_MAX_ADDR; 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),
-				 phy->drv ? phy->drv->name : "unknown");
-		}
-	}
+	mdiobus_for_each_phy(data->bus, phy)
+		dev_info(dev, "phy[%d]: device %s, driver %s\n",
+			 phy->mdio.addr, phydev_name(phy),
+			 phy->drv ? phy->drv->name : "unknown");
 
 	return 0;
 

drivers/net/phy/mdio_bus_provider.c

···
  */
 static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)
 {
-	int i;
+	struct phy_device *phydev;
 
-	for (i = 0; i < PHY_MAX_ADDR; i++) {
-		struct phy_device *phydev;
-		u32 oui;
-
-		phydev = mdiobus_get_phy(bus, i);
-		if (!phydev)
-			continue;
-		oui = phydev->phy_id >> 10;
+	mdiobus_for_each_phy(bus, phydev) {
+		u32 oui = phydev->phy_id >> 10;
 
 		if (oui == MICREL_OUI)
 			return true;
 	}
+
 	return false;
 }
 

drivers/net/phy/phy_device.c

···
 EXPORT_SYMBOL(phy_get_c45_ids);
 
 /**
- * phy_find_first - finds the first PHY device on the bus
+ * phy_find_next - finds the next PHY device on the bus
  * @bus: the target MII bus
+ * @pos: cursor
+ *
+ * Return: next phy_device on the bus, or NULL
  */
-struct phy_device *phy_find_first(struct mii_bus *bus)
+struct phy_device *phy_find_next(struct mii_bus *bus, struct phy_device *pos)
 {
-	struct phy_device *phydev;
-	int addr;
+	for (int addr = pos ? pos->mdio.addr + 1 : 0;
+	     addr < PHY_MAX_ADDR; addr++) {
+		struct phy_device *phydev = mdiobus_get_phy(bus, addr);
 
-	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
-		phydev = mdiobus_get_phy(bus, addr);
 		if (phydev)
 			return phydev;
 	}
 	return NULL;
 }
-EXPORT_SYMBOL(phy_find_first);
+EXPORT_SYMBOL_GPL(phy_find_next);
 
 /**
  * phy_prepare_link - prepares the PHY layer to monitor link status

include/linux/phy.h

···
 	          const struct sfp_upstream_ops *ops);
 struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
 			      phy_interface_t interface);
-struct phy_device *phy_find_first(struct mii_bus *bus);
+struct phy_device *phy_find_next(struct mii_bus *bus, struct phy_device *pos);
 int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 		      u32 flags, phy_interface_t interface);
 int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
···
 
 int phy_restart_aneg(struct phy_device *phydev);
 int phy_reset_after_clk_enable(struct phy_device *phydev);
+
+static inline struct phy_device *phy_find_first(struct mii_bus *bus)
+{
+	return phy_find_next(bus, NULL);
+}
+
+#define mdiobus_for_each_phy(_bus, _phydev)		\
+	for (_phydev = phy_find_first(_bus); _phydev;	\
+	     _phydev = phy_find_next(_bus, _phydev))
 
 #if IS_ENABLED(CONFIG_PHYLIB)
 int phy_start_cable_test(struct phy_device *phydev,