Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 10 Dec 2019 21:33:51 +0100
From:   Marek Behun <marek.behun@nic.cz>
To:     Andrew Lunn <andrew@lunn.ch>
Cc:     Landen Chao <landen.chao@mediatek.com>, f.fainelli@gmail.com,
        vivien.didelot@savoirfairelinux.com, matthias.bgg@gmail.com,
        robh+dt@kernel.org, mark.rutland@arm.com,
        devicetree@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
        davem@davemloft.net, sean.wang@mediatek.com, opensource@vdorst.com,
        frank-w@public-files.de
Subject: Re: [PATCH net-next 4/6] net: dsa: mt7530: Add the support of
 MT7531 switch
Message-ID: <20191210213351.2df6acbf@nic.cz>
In-Reply-To: <20191210163557.GC27714@lunn.ch>
References: <cover.1575914275.git.landen.chao@mediatek.com>
        <6d608dd024edc90b09ba4fe35417b693847f973c.1575914275.git.landen.chao@mediatek.com>
        <20191210163557.GC27714@lunn.ch>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Tue, 10 Dec 2019 17:35:57 +0100
Andrew Lunn <andrew@lunn.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?