fs_enet: MDIO on GPIO support

Port the fs_enet driver to support the MDIO on GPIO driver for PHY access
in addition to the mii-bitbang driver.
Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/fs_enet/fs_enet-main.c

@@ -43,6 +43,7 @@
 #include <asm/uaccess.h>
 
 #ifdef CONFIG_PPC_CPM_NEW_BINDING
+#include <linux/of_gpio.h>
 #include <asm/of_platform.h>
 #endif
 
@@ -1172,8 +1173,7 @@ static int __devinit find_phy(struct device_node *np,
                               struct fs_platform_info *fpi)
 {
 	struct device_node *phynode, *mdionode;
-	struct resource res;
-	int ret = 0, len;
+	int ret = 0, len, bus_id;
 	const u32 *data;
 
 	data  = of_get_property(np, "fixed-link", NULL);
@@ -1190,19 +1190,28 @@ static int __devinit find_phy(struct device_node *np,
 	if (!phynode)
 		return -EINVAL;
 
+	data = of_get_property(phynode, "reg", &len);
+	if (!data || len != 4) {
+		ret = -EINVAL;
+		goto out_put_phy;
+	}
+
 	mdionode = of_get_parent(phynode);
-	if (!mdionode)
+	if (!mdionode) {
+		ret = -EINVAL;
 		goto out_put_phy;
+	}
 
+	bus_id = of_get_gpio(mdionode, 0);
+	if (bus_id < 0) {
+		struct resource res;
 		ret = of_address_to_resource(mdionode, 0, &res);
 		if (ret)
 			goto out_put_mdio;
+		bus_id = res.start;
+	}
 
-	data = of_get_property(phynode, "reg", &len);
-	if (!data || len != 4)
-		goto out_put_mdio;
-
-	snprintf(fpi->bus_id, 16, "%x:%02x", res.start, *data);
+	snprintf(fpi->bus_id, 16, "%x:%02x", bus_id, *data);
 
 out_put_mdio:
 	of_node_put(mdionode);