netdev - Re: [PATCH net-next 4/6] net: dsa: mt7530: Add the support of MT7531 switch

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Message-ID: <20191210213351.2df6acbf@nic.cz>
Date:   Tue, 10 Dec 2019 21:33:51 +0100
From:   Marek Behun <marek.behun@....cz>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Landen Chao <landen.chao@...iatek.com>, f.fainelli@...il.com,
        vivien.didelot@...oirfairelinux.com, matthias.bgg@...il.com,
        robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        davem@...emloft.net, sean.wang@...iatek.com, opensource@...rst.com,
        frank-w@...lic-files.de
Subject: Re: [PATCH net-next 4/6] net: dsa: mt7530: Add the support of
 MT7531 switch

On Tue, 10 Dec 2019 17:35:57 +0100
Andrew Lunn <andrew@...n.ch> wrote:

> On Tue, Dec 10, 2019 at 04:14:40PM +0800, Landen Chao wrote:
> > Add new support for MT7531:
> > 
> > MT7531 is the next generation of MT7530. It is also a 7-ports switch with
> > 5 giga embedded phys, 2 cpu ports, and the same MAC logic of MT7530. Cpu
> > port 6 only supports HSGMII interface. Cpu port 5 supports either RGMII
> > or HSGMII in different HW sku.  
> 
> Hi Landen
> 
> Looking at the code, you seem to treat HSGMII as 2500Base-X. Is this
> correct? Or is it SGMII over clocked to 2.5Gbps?
> 
> 	 Andrew

How would that work? Would 10 and 100 be overclocked to 25 and 250?