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-rw-r--r--net/dsa/dsa.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index b445d492c115..78d4ac97aae3 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -574,7 +574,7 @@ static int dsa_of_probe(struct device *dev)
{
struct device_node *np = dev->of_node;
struct device_node *child, *mdio, *ethernet, *port, *link;
- struct mii_bus *mdio_bus;
+ struct mii_bus *mdio_bus, *mdio_bus_switch;
struct net_device *ethernet_dev;
struct dsa_platform_data *pd;
struct dsa_chip_data *cd;
@@ -636,6 +636,16 @@ static int dsa_of_probe(struct device *dev)
if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
cd->eeprom_len = eeprom_len;
+ mdio = of_parse_phandle(child, "mii-bus", 0);
+ if (mdio) {
+ mdio_bus_switch = of_mdio_find_bus(mdio);
+ if (!mdio_bus_switch) {
+ ret = -EPROBE_DEFER;
+ goto out_free_chip;
+ }
+ cd->host_dev = &mdio_bus_switch->dev;
+ }
+
for_each_available_child_of_node(child, port) {
port_reg = of_get_property(port, "reg", NULL);
if (!port_reg)