Re: [net-next PATCH v2 1/3] net: phy: introduce find_phy_device()

[Andy Shevchenko]

On Wed, Jul 1, 2020 at 9:13 AM Calvin Johnson
<calvin.johnson@xxxxxxxxxxx> wrote:
>
> The PHYs on a 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 find_phy_device() to get the PHY connected to the MAC.

...

> +       struct platform_device *pdev;

This...

> +       fwnode_mdio = fwnode_find_reference(fwnode, "mdio-handle", 0);
> +       dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode_mdio);

> +       if (IS_ERR_OR_NULL(dev))

IS_ERR()?!

> +               return NULL;

> +       pdev =  to_platform_device(dev);
> +       mdio = platform_get_drvdata(pdev);

...and this can be simple:

mdio = dev_get_drvdata(dev);

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

-- 
With Best Regards,
Andy Shevchenko