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>

diff --git a/drivers/net/cpmac.c b/drivers/net/cpmac.c
index 55ee055d3321684ab9a01c1d34ea6431ef568cdf..baeb5bab05b5c135dab5dc63b0dc216494a98f15 100644 (file)
--- 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);