net: phy: adjust fixed_phy_register() return value

Adjust fixed_phy_register() to return struct phy_device *, so that
it becomes easy to use fixed PHYs without device tree support:

  phydev = fixed_phy_register(PHY_POLL, &fixed_phy_status, NULL);
  fixed_phy_set_link_update(phydev, fixed_phy_link_update);
  phy_connect_direct(netdev, phydev, handler_fn, phy_interface);

This change is a prerequisite for modifying bcmgenet driver to work
without a device tree on Broadcom's MIPS-based 7xxx platforms.

Signed-off-by: Petri Gynther <pgynther@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 20 insertions, 17 deletions

diff --git a/drivers/net/phy/fixed.c b/drivers/net/phy/fixed.c
index 5b19fbbda6d4..47872caa0081 100644
--- a/drivers/net/phy/fixed.c
+++ b/drivers/net/phy/fixed.c
@@ -233,9 +233,9 @@ EXPORT_SYMBOL_GPL(fixed_phy_del);
 static int phy_fixed_addr;
 static DEFINE_SPINLOCK(phy_fixed_addr_lock);
 
-int fixed_phy_register(unsigned int irq,
-                       struct fixed_phy_status *status,
-                       struct device_node *np)
+struct phy_device *fixed_phy_register(unsigned int irq,
+                                      struct fixed_phy_status *status,
+                                      struct device_node *np)
 {
         struct fixed_mdio_bus *fmb = &platform_fmb;
         struct phy_device *phy;
@@ -246,19 +246,19 @@ int fixed_phy_register(unsigned int irq,
         spin_lock(&phy_fixed_addr_lock);
         if (phy_fixed_addr == PHY_MAX_ADDR) {
                 spin_unlock(&phy_fixed_addr_lock);
-                return -ENOSPC;
+                return ERR_PTR(-ENOSPC);
         }
         phy_addr = phy_fixed_addr++;
         spin_unlock(&phy_fixed_addr_lock);
 
         ret = fixed_phy_add(PHY_POLL, phy_addr, status);
         if (ret < 0)
-                return ret;
+                return ERR_PTR(ret);
 
         phy = get_phy_device(fmb->mii_bus, phy_addr, false);
         if (!phy || IS_ERR(phy)) {
                 fixed_phy_del(phy_addr);
-                return -EINVAL;
+                return ERR_PTR(-EINVAL);
         }
 
         of_node_get(np);
@@ -269,10 +269,10 @@ int fixed_phy_register(unsigned int irq,
                 phy_device_free(phy);
                 of_node_put(np);
                 fixed_phy_del(phy_addr);
-                return ret;
+                return ERR_PTR(ret);
         }
 
-        return 0;
+        return phy;
 }
 
 static int __init fixed_mdio_bus_init(void)
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index a85d80012993..1bd43053b8c7 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -286,6 +286,7 @@ int of_phy_register_fixed_link(struct device_node *np)
         struct device_node *fixed_link_node;
         const __be32 *fixed_link_prop;
         int len;
+        struct phy_device *phy;
 
         /* New binding */
         fixed_link_node = of_get_child_by_name(np, "fixed-link");
@@ -299,7 +300,8 @@ int of_phy_register_fixed_link(struct device_node *np)
                 status.asym_pause = of_property_read_bool(fixed_link_node,
                                                           "asym-pause");
                 of_node_put(fixed_link_node);
-                return fixed_phy_register(PHY_POLL, &status, np);
+                phy = fixed_phy_register(PHY_POLL, &status, np);
+                return IS_ERR(phy) ? PTR_ERR(phy) : 0;
         }
 
         /* Old binding */
@@ -310,7 +312,8 @@ int of_phy_register_fixed_link(struct device_node *np)
                 status.speed = be32_to_cpu(fixed_link_prop[2]);
                 status.pause = be32_to_cpu(fixed_link_prop[3]);
                 status.asym_pause = be32_to_cpu(fixed_link_prop[4]);
-                return fixed_phy_register(PHY_POLL, &status, np);
+                phy = fixed_phy_register(PHY_POLL, &status, np);
+                return IS_ERR(phy) ? PTR_ERR(phy) : 0;
         }
 
         return -ENODEV;
diff --git a/include/linux/phy_fixed.h b/include/linux/phy_fixed.h
index 941138664c1d..f2ca1b459377 100644
--- a/include/linux/phy_fixed.h
+++ b/include/linux/phy_fixed.h
@@ -14,9 +14,9 @@ struct device_node;
 #ifdef CONFIG_FIXED_PHY
 extern int fixed_phy_add(unsigned int irq, int phy_id,
                          struct fixed_phy_status *status);
-extern int fixed_phy_register(unsigned int irq,
-                              struct fixed_phy_status *status,
-                              struct device_node *np);
+extern struct phy_device *fixed_phy_register(unsigned int irq,
+                                             struct fixed_phy_status *status,
+                                             struct device_node *np);
 extern void fixed_phy_del(int phy_addr);
 extern int fixed_phy_set_link_update(struct phy_device *phydev,
                         int (*link_update)(struct net_device *,
@@ -27,11 +27,11 @@ static inline int fixed_phy_add(unsigned int irq, int phy_id,
 {
         return -ENODEV;
 }
-static inline int fixed_phy_register(unsigned int irq,
-                                     struct fixed_phy_status *status,
-                                     struct device_node *np)
+static inline struct phy_device *fixed_phy_register(unsigned int irq,
+                                                struct fixed_phy_status *status,
+                                                struct device_node *np)
 {
-        return -ENODEV;
+        return ERR_PTR(-ENODEV);
 }
 static inline int fixed_phy_del(int phy_addr)
 {