net: macb: add fixed-link node support

In case the MACB is directly connected to a
non-mdio PHY/device, it should be possible to provide
a fixed link configuration in the DT.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 4b0168b..3ae9d80 100644 (file)
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -425,32 +425,40 @@ static int macb_mii_probe(struct net_device *dev)
        int phy_irq;
        int ret;
 
-       phydev = phy_find_first(bp->mii_bus);
-       if (!phydev) {
-               netdev_err(dev, "no PHY found\n");
-               return -ENXIO;
-       }
+       if (bp->phy_node) {
+               phydev = of_phy_connect(dev, bp->phy_node,
+                                       &macb_handle_link_change, 0,
+                                       bp->phy_interface);
+               if (!phydev)
+                       return -ENODEV;
+       } else {
+               phydev = phy_find_first(bp->mii_bus);
+               if (!phydev) {
+                       netdev_err(dev, "no PHY found\n");
+                       return -ENXIO;
+               }
 
-       pdata = dev_get_platdata(&bp->pdev->dev);
-       if (pdata) {
-               if (gpio_is_valid(pdata->phy_irq_pin)) {
-                       ret = devm_gpio_request(&bp->pdev->dev,
-                                               pdata->phy_irq_pin, "phy int");
-                       if (!ret) {
-                               phy_irq = gpio_to_irq(pdata->phy_irq_pin);
-                               phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
+               pdata = dev_get_platdata(&bp->pdev->dev);
+               if (pdata) {
+                       if (gpio_is_valid(pdata->phy_irq_pin)) {
+                               ret = devm_gpio_request(&bp->pdev->dev,
+                                                       pdata->phy_irq_pin, "phy int");
+                               if (!ret) {
+                                       phy_irq = gpio_to_irq(pdata->phy_irq_pin);
+                                       phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
+                               }
+                       } else {
+                               phydev->irq = PHY_POLL;
                        }
-               } else {
-                       phydev->irq = PHY_POLL;
                }
-       }
 
-       /* attach the mac to the phy */
-       ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
-                                bp->phy_interface);
-       if (ret) {
-               netdev_err(dev, "Could not attach to PHY\n");
-               return ret;
+               /* attach the mac to the phy */
+               ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
+                                        bp->phy_interface);
+               if (ret) {
+                       netdev_err(dev, "Could not attach to PHY\n");
+                       return ret;
+               }
        }
 
        /* mask with MAC supported features */
@@ -499,26 +507,37 @@ static int macb_mii_init(struct macb *bp)
 
        np = bp->pdev->dev.of_node;
        if (np) {
-               /* try dt phy registration */
-               err = of_mdiobus_register(bp->mii_bus, np);
+               if (of_phy_is_fixed_link(np)) {
+                       if (of_phy_register_fixed_link(np) < 0) {
+                               dev_err(&bp->pdev->dev,
+                                       "broken fixed-link specification\n");
+                               goto err_out_unregister_bus;
+                       }
+                       bp->phy_node = of_node_get(np);
 
-               /* fallback to standard phy registration if no phy were
-                * found during dt phy registration
-                */
-               if (!err && !phy_find_first(bp->mii_bus)) {
-                       for (i = 0; i < PHY_MAX_ADDR; i++) {
-                               struct phy_device *phydev;
-
-                               phydev = mdiobus_scan(bp->mii_bus, i);
-                               if (IS_ERR(phydev) &&
-                                   PTR_ERR(phydev) != -ENODEV) {
-                                       err = PTR_ERR(phydev);
-                                       break;
+                       err = mdiobus_register(bp->mii_bus);
+               } else {
+                       /* try dt phy registration */
+                       err = of_mdiobus_register(bp->mii_bus, np);
+
+                       /* fallback to standard phy registration if no phy were
+                        * found during dt phy registration
+                        */
+                       if (!err && !phy_find_first(bp->mii_bus)) {
+                               for (i = 0; i < PHY_MAX_ADDR; i++) {
+                                       struct phy_device *phydev;
+
+                                       phydev = mdiobus_scan(bp->mii_bus, i);
+                                       if (IS_ERR(phydev) &&
+                                           PTR_ERR(phydev) != -ENODEV) {
+                                               err = PTR_ERR(phydev);
+                                               break;
+                                       }
                                }
-                       }
 
-                       if (err)
-                               goto err_out_unregister_bus;
+                               if (err)
+                                       goto err_out_unregister_bus;
+                       }
                }
        } else {
                for (i = 0; i < PHY_MAX_ADDR; i++)
@@ -3438,6 +3457,7 @@ static int macb_remove(struct platform_device *pdev)
                clk_disable_unprepare(bp->hclk);
                clk_disable_unprepare(bp->pclk);
                clk_disable_unprepare(bp->rx_clk);
+               of_node_put(bp->phy_node);
                free_netdev(dev);
        }
 

diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index ec037b0..2510661 100644 (file)
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -930,6 +930,7 @@ struct macb {
        struct macb_or_gem_ops  macbgem_ops;
 
        struct mii_bus          *mii_bus;
+       struct device_node      *phy_node;
        int                     link;
        int                     speed;
        int                     duplex;