altera tse: add support for fixed-links.

Add support for fixed-links in configurations without PHY.
(e.g. connection to a switch, SGMII point to point, SFPs)

Check: Documentation/devicetree/bindings/net/fixed-link.txt.
Signed-off-by: Andreas Oetken <ennoerlangen@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 29 insertions, 8 deletions

diff --git a/drivers/net/ethernet/altera/altera_tse_main.c b/drivers/net/ethernet/altera/altera_tse_main.c
index 90a76306ad0f..0533c051a3e5 100644
--- a/drivers/net/ethernet/altera/altera_tse_main.c
+++ b/drivers/net/ethernet/altera/altera_tse_main.c
@@ -777,6 +777,8 @@ static int init_phy(struct net_device *dev)
         struct altera_tse_private *priv = netdev_priv(dev);
         struct phy_device *phydev;
         struct device_node *phynode;
+        bool fixed_link = false;
+        int rc = 0;
 
         /* Avoid init phy in case of no phy present */
         if (!priv->phy_iface)
@@ -789,13 +791,32 @@ static int init_phy(struct net_device *dev)
         phynode = of_parse_phandle(priv->device->of_node, "phy-handle", 0);
 
         if (!phynode) {
-                netdev_dbg(dev, "no phy-handle found\n");
-                if (!priv->mdio) {
-                        netdev_err(dev,
-                                   "No phy-handle nor local mdio specified\n");
-                        return -ENODEV;
+                /* check if a fixed-link is defined in device-tree */
+                if (of_phy_is_fixed_link(priv->device->of_node)) {
+                        rc = of_phy_register_fixed_link(priv->device->of_node);
+                        if (rc < 0) {
+                                netdev_err(dev, "cannot register fixed PHY\n");
+                                return rc;
+                        }
+
+                        /* In the case of a fixed PHY, the DT node associated
+                         * to the PHY is the Ethernet MAC DT node.
+                         */
+                        phynode = of_node_get(priv->device->of_node);
+                        fixed_link = true;
+
+                        netdev_dbg(dev, "fixed-link detected\n");
+                        phydev = of_phy_connect(dev, phynode,
+                                                &altera_tse_adjust_link,
+                                                0, priv->phy_iface);
+                } else {
+                        netdev_dbg(dev, "no phy-handle found\n");
+                        if (!priv->mdio) {
+                                netdev_err(dev, "No phy-handle nor local mdio specified\n");
+                                return -ENODEV;
+                        }
+                        phydev = connect_local_phy(dev);
                 }
-                phydev = connect_local_phy(dev);
         } else {
                 netdev_dbg(dev, "phy-handle found\n");
                 phydev = of_phy_connect(dev, phynode,
@@ -819,10 +840,10 @@ static int init_phy(struct net_device *dev)
         /* Broken HW is sometimes missing the pull-up resistor on the
          * MDIO line, which results in reads to non-existent devices returning
          * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
-         * device as well.
+         * device as well. If a fixed-link is used the phy_id is always 0.
          * Note: phydev->phy_id is the result of reading the UID PHY registers.
          */
-        if (phydev->phy_id == 0) {
+        if ((phydev->phy_id == 0) && !fixed_link) {
                 netdev_err(dev, "Bad PHY UID 0x%08x\n", phydev->phy_id);
                 phy_disconnect(phydev);
                 return -ENODEV;