netdev - Re: [PATCH net-next v3 2/3] net: ethernet: mediatek: Re-add support SGMII

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Date:   Sun, 25 Aug 2019 11:41:48 +0000
From:   René van Dorst <opensource@...rst.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Nelson Chang <nelson.chang@...iatek.com>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-mips@...r.kernel.org,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Stefan Roese <sr@...x.de>
Subject: Re: [PATCH net-next v3 2/3] net: ethernet: mediatek: Re-add support
 SGMII

Hi Russell,

Quoting Russell King - ARM Linux admin <linux@...linux.org.uk>:

> Hi René,
>
> On Sat, Aug 24, 2019 at 01:11:17PM +0000, René van Dorst wrote:
>> Hi Russell,
>>
>> Mediatek calls it Turbo RGMII. It is a overclock version of RGMII mode.
>> It is used between first GMAC and port 6 of the mt7530 switch. Can be used
>> with
>> an internal and an external mt7530 switch.
>>
>> TRGMII speed are:
>> * mt7621: 1200Mbit
>> * mt7623: 2000Mbit and 2600Mbit.
>>
>> I think that TRGMII is only used in a fixed-link situation in combination
>> with a
>> mt7530 switch and running and maximum speed/full duplex. So reporting
>> 1000baseT_Full seems to me the right option.
>
> I think we can ignore this one for the purposes of merging this patch
> set, since this seems to be specific to this setup.  Neither 1000BaseT
> nor 1000BaseX fit very well, but we have to choose something.
>
>> PHY_INTERFACE_MODE_GMII:
>> 	  10baseT_Half
>> 	  10baseT_Full
>> 	 100baseT_Half
>> 	 100baseT_Full
>> 	1000baseT_Half
>> 	1000baseT_Full
>
> I think GMII can be connected to a PHY that can convert to 1000BaseX, so
> should probably include that here too.
>

Thanks for reviewing.
I shall add that too.

I send v4 today.

Greats,

René


> Thanks.
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
> According to speedtest.net: 11.9Mbps down 500kbps up