Commit 0830c980 authored by Florian Fainelli's avatar Florian Fainelli Committed by David S. Miller

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: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 967dd82f
...@@ -316,6 +316,17 @@ static int b53_mdio_probe(struct mdio_device *mdiodev) ...@@ -316,6 +316,17 @@ static int b53_mdio_probe(struct mdio_device *mdiodev)
return -ENODEV; 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); dev = b53_switch_alloc(&mdiodev->dev, &b53_mdio_ops, mdiodev->bus);
if (!dev) if (!dev)
return -ENOMEM; return -ENOMEM;
......
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