net/cadence/macb: add support for dt phy definition

The macb driver only handle PHY description through platform_data
(macb_platform_data).
Thus, when using dt you cannot define phy properties like phy address or
phy irq pin.

This patch makes use of the of_mdiobus_register to add support for
phy device definition using dt.
A fallback to the autoscan procedure is added in case there is no phy
devices defined in dt.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
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 e866608..fe06ab0 100644 (file)
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -27,6 +27,7 @@
 #include <linux/phy.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_mdio.h>
 #include <linux/of_net.h>
 #include <linux/pinctrl/consumer.h>
 
@@ -314,6 +315,7 @@ static int macb_mii_probe(struct net_device *dev)
 int macb_mii_init(struct macb *bp)
 {
        struct macb_platform_data *pdata;
+       struct device_node *np;
        int err = -ENXIO, i;
 
        /* Enable management port */
@@ -335,21 +337,46 @@ int macb_mii_init(struct macb *bp)
        bp->mii_bus->parent = &bp->dev->dev;
        pdata = bp->pdev->dev.platform_data;
 
-       if (pdata)
-               bp->mii_bus->phy_mask = pdata->phy_mask;
-
        bp->mii_bus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
        if (!bp->mii_bus->irq) {
                err = -ENOMEM;
                goto err_out_free_mdiobus;
        }
 
-       for (i = 0; i < PHY_MAX_ADDR; i++)
-               bp->mii_bus->irq[i] = PHY_POLL;
-
        dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
 
-       if (mdiobus_register(bp->mii_bus))
+       np = bp->pdev->dev.of_node;
+       if (np) {
+               /* 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)) {
+                                       err = PTR_ERR(phydev);
+                                       break;
+                               }
+                       }
+
+                       if (err)
+                               goto err_out_unregister_bus;
+               }
+       } else {
+               for (i = 0; i < PHY_MAX_ADDR; i++)
+                       bp->mii_bus->irq[i] = PHY_POLL;
+
+               if (pdata)
+                       bp->mii_bus->phy_mask = pdata->phy_mask;
+
+               err = mdiobus_register(bp->mii_bus);
+       }
+
+       if (err)
                goto err_out_free_mdio_irq;
 
        if (macb_mii_probe(bp->dev) != 0) {