Re: [PATCH 1/3] net: thunderx: Cleanup PHY probing code.

From: Andrew Lunn
Date: Fri Mar 11 2016 - 16:35:29 EST

> For this phy, we have:
> compatible = "cortina,cs4223-slice";

That actually means something else is happening, i think.

of_mdiobus_register() looks at the children, and decides if each child
is a phy or an mdio device, by calling of_mdiobus_child_is_phy().
Since this compatible string is not in whitelist_phys[], it will
return false. of_mdiobus_register() will then do a
of_mdiobus_register_device(). This compatible means it is an MDIO
device, not a PHY. So when you later call of_phy_find_device() it is
always going to return NULL, because there is no PHY there, only an
MDIO device.

How usable is the hardware without a PHY driver? Is a better solution
that your write a very minimal PHY driver?