net: ag71xx: fix mdio subnode support

This patch is syncing driver with actual devicetree documentation:
Documentation/devicetree/bindings/net/qca,ar71xx.txt
|Optional subnodes:
|- mdio : specifies the mdio bus, used as a container for phy nodes
|  according to phy.txt in the same directory

The driver was working with fixed phy without any noticeable issues. This bug
was uncovered by introducing dsa ar9331-switch driver.
Since no one reported this bug until now, I assume no body is using it
and this patch should not brake existing system.

Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c
index 7548247455d70bcd92ac8eedf6f08b29a3f08c8b..1b1a09095c0dcfc3a40d127d306349e4ec690b26 100644 (file)
--- a/drivers/net/ethernet/atheros/ag71xx.c
+++ b/drivers/net/ethernet/atheros/ag71xx.c
@@ -526,7 +526,7 @@ static int ag71xx_mdio_probe(struct ag71xx *ag)
        struct device *dev = &ag->pdev->dev;
        struct net_device *ndev = ag->ndev;
        static struct mii_bus *mii_bus;
-       struct device_node *np;
+       struct device_node *np, *mnp;
        int err;
 
        np = dev->of_node;
@@ -571,7 +571,9 @@ static int ag71xx_mdio_probe(struct ag71xx *ag)
                msleep(200);
        }
 
-       err = of_mdiobus_register(mii_bus, np);
+       mnp = of_get_child_by_name(np, "mdio");
+       err = of_mdiobus_register(mii_bus, mnp);
+       of_node_put(mnp);
        if (err)
                goto mdio_err_put_clk;