cpmac: fallback to switch mode if no PHY chip found

If we were unable to detect a PHY on any of the MDIO bus id we tried instead of
bailing out with -ENODEV, assume the MAC is connected to a switch and use MDIO
bus 0. This unbreaks quite a lot of devices out there whose switch cannot be
detected.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/cpmac.c b/drivers/net/cpmac.c
index 55ee055d3321..baeb5bab05b5 100644
--- a/drivers/net/cpmac.c
+++ b/drivers/net/cpmac.c
@@ -1137,8 +1137,9 @@ static int __devinit cpmac_probe(struct platform_device *pdev)
         }
 
         if (phy_id == PHY_MAX_ADDR) {
-                dev_err(&pdev->dev, "no PHY present\n");
-                return -ENODEV;
+                dev_err(&pdev->dev, "no PHY present, falling back to switch on MDIO bus 0\n");
+                strncpy(mdio_bus_id, "0", MII_BUS_ID_SIZE); /* fixed phys bus */
+                phy_id = pdev->id;
         }
 
         dev = alloc_etherdev_mq(sizeof(*priv), CPMAC_QUEUES);