[PATCH] net: mdio: of_mdio: check for already registered phy before creating new instances

[Daniel Mack <zonque@gmail.com>]

In of_mdiobus_register_phy(), check if the phy with the given address is
already registered within the mii bus before calling phy_device_create()
or get_phy_device().

This allows us to augment auto-probed phy devices with extra information
via DT. Without this patch, a second instance of the phydev is created
unnecessarily.

Signed-off-by: Daniel Mack <zonque@gmail.com>
---
 drivers/of/of_mdio.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 9a95831..264ea3f 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -72,10 +72,15 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *chi
 	is_c45 = of_device_is_compatible(child,
 					 "ethernet-phy-ieee802.3-c45");
 
-	if (!is_c45 && !of_get_phy_id(child, &phy_id))
-		phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
-	else
-		phy = get_phy_device(mdio, addr, is_c45);
+	/* Check if the phy we're looking for is already registered */
+	phy = mdio->phy_map[addr];
+	if (!phy) {
+		if (!is_c45 && !of_get_phy_id(child, &phy_id))
+			phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
+		else
+			phy = get_phy_device(mdio, addr, is_c45);
+	}
+
 	if (!phy || IS_ERR(phy))
 		return 1;
 
-- 
1.9.0