net: dsa: OF-ware slave_mii_bus

If found, register the DSA internally allocated slave_mii_bus with an OF
"mdio" child object. It can save some drivers from creating their
custom internal MDIO bus.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index d0a2452..cac48a7 100644 (file)
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/rtnetlink.h>
 #include <linux/of.h>
+#include <linux/of_mdio.h>
 #include <linux/of_net.h>
 #include <net/devlink.h>
 #include <net/sch_generic.h>
@@ -852,6 +853,7 @@ disconnect:
 static int dsa_switch_setup(struct dsa_switch *ds)
 {
        struct dsa_devlink_priv *dl_priv;
+       struct device_node *dn;
        struct dsa_port *dp;
        int err;
 
@@ -907,7 +909,10 @@ static int dsa_switch_setup(struct dsa_switch *ds)
 
                dsa_slave_mii_bus_init(ds);
 
-               err = mdiobus_register(ds->slave_mii_bus);
+               dn = of_get_child_by_name(ds->dev->of_node, "mdio");
+
+               err = of_mdiobus_register(ds->slave_mii_bus, dn);
+               of_node_put(dn);
                if (err < 0)
                        goto free_slave_mii_bus;
        }