net: dsa: b53: Add BCM7445 quirk

The Broadcom BCM7445 STB chip has an issued in its revision D0 which was
previously worked around in drivers/net/dsa/bcm_sf2.c where we may
end-up double programming the integrated BCM7445 switch (bcm_sf2) and an
external Broadcom switch such as BCM53125, since these are mostly
register compatible.

Add a small quirk which just defers probing until we are sitting on the
slave DSA MDIO bus, which will allow us to intercept reads/writes and
funnel them through the SF2 internal MDIO master (which happens to
disconnect its pseudo PHY).

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/b53/b53_mdio.c b/drivers/net/dsa/b53/b53_mdio.c
index c6cf7cf..aa87c3f 100644 (file)
--- a/drivers/net/dsa/b53/b53_mdio.c
+++ b/drivers/net/dsa/b53/b53_mdio.c
@@ -316,6 +316,17 @@ static int b53_mdio_probe(struct mdio_device *mdiodev)
                return -ENODEV;
        }
 
+       /* First probe will come from SWITCH_MDIO controller on the 7445D0
+        * switch, which will conflict with the 7445 integrated switch
+        * pseudo-phy (we end-up programming both). In that case, we return
+        * -EPROBE_DEFER for the first time we get here, and wait until we come
+        * back with the slave MDIO bus which has the correct indirection
+        * layer setup
+        */
+       if (of_machine_is_compatible("brcm,bcm7445d0") &&
+           strcmp(mdiodev->bus->name, "sf2 slave mii"))
+               return -EPROBE_DEFER;
+
        dev = b53_switch_alloc(&mdiodev->dev, &b53_mdio_ops, mdiodev->bus);
        if (!dev)
                return -ENOMEM;