On Wed, Jul 8, 2020 at 8:35 PM Calvin Johnson
[off-list ref] wrote:

The PHYs on an mdiobus are probed and registered using mdiobus_register().
Later, for connecting these PHYs to MAC, the PHYs registered on the
mdiobus have to be referenced.

For each MAC node, a property "mdio-handle" is used to reference the
MDIO bus on which the PHYs are registered. On getting hold of the MDIO
bus, use phy_find_by_fwnode() to get the PHY connected to the MAC.

Introduce fwnode_mdio_find_bus() to find the mii_bus that corresponds
to given mii_bus fwnode.

...

+       err = fwnode_property_read_u32(fwnode, "phy-channel", &addr);
+       if (err < 0 || addr < 0 || addr >= PHY_MAX_ADDR)
+               return NULL;

Just wondering if we can return an error pointer here (sorry if it has
been discussed already).

-- 
With Best Regards,
Andy Shevchenko