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>

1 files changed, 20 insertions, 11 deletions

diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
index a5baaf59ff66..fb7c47790bd6 100644
--- a/drivers/net/fs_enet/fs_enet-main.c
+++ b/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;
 
-        mdionode = of_get_parent(phynode);
-        if (!mdionode)
+        data = of_get_property(phynode, "reg", &len);
+        if (!data || len != 4) {
+                ret = -EINVAL;
                 goto out_put_phy;
+        }
 
-        ret = of_address_to_resource(mdionode, 0, &res);
-        if (ret)
-                goto out_put_mdio;
+        mdionode = of_get_parent(phynode);
+        if (!mdionode) {
+                ret = -EINVAL;
+                goto out_put_phy;
+        }
 
-        data = of_get_property(phynode, "reg", &len);
-        if (!data || len != 4)
-                goto out_put_mdio;
+        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;
+        }
 
-        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);