Commit 0830c980 authored Jun 09, 2016 by Florian Fainelli Committed by David S. Miller Jun 09, 2016

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>

parent 967dd82f

drivers/net/dsa/b53/b53_mdio.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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;