Re: [PATCH 0/2] add Ethernet driver support for mt2712

[Jose Abreu <Jose.Abreu@synopsys.com>]

Hi Biao,

On 18-09-2018 04:24, biao huang wrote:
> Hi Jose, Andrew,
> 	Thanks for your comments.
> 	Synopsys ip version in mt2712 is 4.21a, and followed ic will use 5.10a.
> it seems GMAC4+ is a good choice. I'll try to  extend STMMAC to support
> mt2712.
> 	Any tips about extend STMMAC? or anythings I should pay attention to?

STMMAC already supports 4.21a and 5.10a. You only have to make
sure that your regbank and descriptors matches.

Thanks and Best Regards,
Jose Miguel Abreu

> 	
> On Mon, 2018-09-17 at 17:18 +0100, Jose Abreu wrote:
>> Hi Andrew, Biao,
>>
>> On 17-09-2018 16:24, Andrew Lunn wrote:
>>> On Mon, Sep 17, 2018 at 02:29:21PM +0800, Biao Huang wrote:
>>>
>>> Adding in the STMMAC driver maintainers.
>>>
>>>> Ethernet in mt2712 is totally different from that in
>>>> drivers/net/ethernet/mediatek/*, so we add new folder for mt2712 SoC.
>>>>
>>>> The mt2712 Ethernet IP is from Synopsys, and we notice that there is a
>>>> reference driver in drivers/net/ethernet/synopsys/*. But
>>>> 1. our version is only for 10/100/1000Mbps, not for 2.5/4/5Gbps.
>>>> mt2712 Ethernet design is differnet from that in synopsys folder in many
>>>> aspects, and some key features are not included in mt2712, such as rss
>>>> and split header. At the same time, some features we need have not been
>>>> implenmented in synopsys folder.
>>> In general, we don't have two very similar drivers. We try to have one
>>> driver. If the problem was just missing features in the stmmac driver,
>>> you can add them. I doubt not supporting 2.5/4/5Gbps in your silicon
>>> is an issue, since very few STMMAC devices have this. By split header,
>>> do you mean support for TSO? That seems to be a gmac4 or newer
>>> feature, but the driver supports not having tso support in hardware.
>>>
>>> Giuseppe, Alexandre, Jose: Please can you look at the proposed driver
>>> and see how much it really differs from the STMMAC driver. 
>> Thanks for the cc Andrew, indeed this looks very similar and the
>> register bank matches, by what I've seen, GMAC 4+.
>>
>>> How easy
>>> would it be to extend stmmac it to support the mt2712?
>> Very easy, as I've just done with XGMAC2. If Biao wants to expand
>> stmmac functionality I'm all in favor!
>>
>> Thanks and Best Regards,
>> Jose Miguel Abreu
>>
>>> Thanks
>>> 	Andrew
> Best Regards!
> Biao
>