netdev - Re: [PATCH net-next v2 2/3] net: ethernet: mediatek: Re-add support SGMII

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Message-ID: <20190822211156.GV13294@shell.armlinux.org.uk>
Date:   Thu, 22 Aug 2019 22:11:56 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     René van Dorst <opensource@...rst.com>
Cc:     Nelson Chang <nelson.chang@...iatek.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        netdev@...r.kernel.org, Sean Wang <sean.wang@...iatek.com>,
        linux-mips@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        John Crispin <john@...ozen.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Stefan Roese <sr@...x.de>,
        "David S . Miller" <davem@...emloft.net>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v2 2/3] net: ethernet: mediatek: Re-add support
 SGMII

Hi Rene,

On Thu, Aug 22, 2019 at 07:50:33PM +0000, René van Dorst wrote:
> Quoting Russell King - ARM Linux admin <linux@...linux.org.uk>:
> > Isn't this set for Cisco SGMII as well as for 802.3 1000BASE-X and
> > the up-clocked 2500BASE-X modes?
> > 
> > If so, is there a reason why 10Mbps and 100Mbps speeds aren't
> > supported on Cisco SGMII links?
> 
> I can only tell a bit about the mt7622 SOC, datasheet tells me that:
> 
> The SGMII is the interface between 10/100/1000/2500 Mbps PHY and Ethernet MAC,
> the spec is raised by Cisco in 1999, which is aims for pin reduction compare
> with the GMII. It uses 2 differential data pair for TX and RX with clock
> embedded bit stream to convey frame data and port ability information.
> The core leverages the 1000Base-X PCS and Auto-Negotiation from IEEE 802.3
> specification (clause 36/37). This IP can support up to 3.125G baud for
> 2.5Gbps
> (proprietary 2500Base-X) data rate of MAC by overclocking.
> 
> Also features tells me: Support 10/100/1000/2500 Mbps in full duplex mode and
> 10/100 Mbps in half duplex mode.

Yep, that is what I'd expect.  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