Hi,
On 09. 03. 19 17:19, Andrew Lunn wrote:
>> Related to this, I have a query on how the DT node for gmii2rgmii should
>> look.
>> One of the users of gmii2rgmii is Cadence macb driver. In Xilinx tree, we use
>> this piece of code to register this mdiobus:
>> + mdio_np = of_get_child_by_name(np, "mdio");
>> + if (mdio_np) {
>> + of_node_put(mdio_np);
>> + err = of_mdiobus_register(bp->mii_bus, mdio_np);
>> + if (err)
>> + goto err_out_unregister_bus;
>>
>> And the DT node looks like this:
>> ethernet {
>> phy-mode = "gmii";
>> phy-handle = <&extphy>;
>>
>> mdio {
>> extphy {
>> reg = <x>;
>> };
>> gmii_to_rgmii{
>> compatible = "xlnx,gmii-to-rgmii-1.0";
>> phy-handle = <&extphy>;
>> reg = <x>;
>> };
>> };
>> };
>
> Hi Harini
>
> You have this setup:
>
> MAC <==> GMII2RGMII <==> RGMII_PHY
>
> So you want the MAC phy-handle to point to the gmii_to_rgmii 'PHY'.
That means that MAC should talk to GMII2RGMII bridge as normall talks to
RGMII_PHY and then GMII2RGMII bridge should talk to RGMII_PHY.
Anyway good to read it because that's exactly how we have done it in u-boot.
Thanks,
Michal
