Re: SoCFPGA ethernet broken

Dinh Nguyen
2015-10-16T19:10:02Z

On Fri, 16 Oct 2015, David Daney wrote:

> On 10/16/2015 08:56 AM, Andrew Lunn wrote:
> > > So I think I'll move to inspect what Florian had suggested, and that was
> > > to look
> > > at:
> > > drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c::stmmac_mdio_register
> >
> > I have a suspicion. If you look at the phy driver it does:
> >
> > static int ksz9021_config_init(struct phy_device *phydev)
> > {
> > const struct device *dev = &phydev->dev;
> > const struct device_node *of_node = dev->of_node;
> >
> > if (!of_node && dev->parent->of_node)
> > of_node = dev->parent->of_node;
> >
>
> Maybe we need to walk up the hierarchy.
>
> Perhaps something like:
>
> const struct device *dev_walker;
>
> dev_walker = &phydev->dev;
> do {
> of_node = dev_walker->of_node;
> dev_walker = dev_walker->parent;
> } while (!of_node && dev_walker);
>

The above code seems to have fixed the issue.

> An alternative would be to assign the bus the same of_node as the bus parent.
>
> If either approach works, you can add:
> Acked-by: David Daney <david.daney@cavium.com>
>
> to the patch that implements it.
>
> >
> > In your case, you don't have a phy node in your device tree, so of_node
> > is NULL. So it looks in the parent device.
> >
> > phylib: Make PHYs children of their MDIO bus, not the bus' parent.
> >
> > changed what the parent is. It is now the mdio device. Before, i
> > suspect it was the MAC. Hence it found your properties in the MAC
> > node.
> >
> > What i think you might want to do is change this code. Rather than
> > look a dev->parent->of_node; you might want
> > phydev->attached_dev->dev->of_node.
> >
> > This assumes the phy has been attached to the MAC. I've no idea of the
> > ordering, so maybe it has not been attached yet?
> >
> > dp83867.c has similar code. However quick grep did not find any
> > mainline users with properties in the MAC node. If that is true, i
> > would suggest removing the code looking in the parent for that phy
> > driver.
> >
> > Andrew
> >
>
>

BR,
Dinh