net: mvpp2: allow MDIO registration for fixed links

Currently, there are 2 valid cases for interface, PHY
and mdio relation:
  - If an interface has PHY handler, it'll call
    mdio_mii_bus_get_from_phy(), which will register
    MDIO bus.
  - If we want to use fixed-link for an interface,
    PHY handle is not defined in the DTS, and no
    MDIO is registered.

There is a third case, for some boards (with switch),
the MDIO is used for switch configuration, but the interface
itself uses fixed link. This patch allows this option by
checking if fixed-link subnode is defined, in this case,
MDIO bus is registers, but the PHY address is set to
PHY_MAX_ADDR for this interface, so this interface will
not try to access the PHY later on.

Signed-off-by: Stefan Chulski <stefanc@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/drivers/net/mvpp2.c b/drivers/net/mvpp2.c
index 3d920e8..c5bfe41 100644 (file)
--- a/drivers/net/mvpp2.c
+++ b/drivers/net/mvpp2.c
@@ -4787,16 +4787,25 @@ static int phy_info_parse(struct udevice *dev, struct mvpp2_port *port)
        u32 id;
        u32 phyaddr = 0;
        int phy_mode = -1;
+       int fixed_link = 0;
        int ret;
 
        phy_node = fdtdec_lookup_phandle(gd->fdt_blob, port_node, "phy");
+       fixed_link = fdt_subnode_offset(gd->fdt_blob, port_node, "fixed-link");
 
        if (phy_node > 0) {
                int parent;
-               phyaddr = fdtdec_get_int(gd->fdt_blob, phy_node, "reg", 0);
-               if (phyaddr < 0) {
-                       dev_err(dev, "could not find phy address\n");
-                       return -1;
+
+               if (fixed_link != -FDT_ERR_NOTFOUND) {
+                       /* phy_addr is set to invalid value for fixed links */
+                       phyaddr = PHY_MAX_ADDR;
+               } else {
+                       phyaddr = fdtdec_get_int(gd->fdt_blob, phy_node,
+                                                "reg", 0);
+                       if (phyaddr < 0) {
+                               dev_err(dev, "could not find phy address\n");
+                               return -1;
+                       }
                }
                parent = fdt_parent_offset(gd->fdt_blob, phy_node);
                ret = uclass_get_device_by_of_offset(UCLASS_MDIO, parent,