From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russell King - ARM Linux admin Subject: Re: [PATCH net-next v2 2/3] net: ethernet: mediatek: Re-add support SGMII Date: Thu, 22 Aug 2019 22:11:56 +0100 Message-ID: <20190822211156.GV13294@shell.armlinux.org.uk> References: <20190821144336.9259-1-opensource@vdorst.com> <20190821144336.9259-3-opensource@vdorst.com> <20190822144433.GT13294@shell.armlinux.org.uk> <20190822195033.Horde.hEW8FBGNfFrugQOCv0gaDfx@www.vdorst.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Return-path: Content-Disposition: inline In-Reply-To: <20190822195033.Horde.hEW8FBGNfFrugQOCv0gaDfx@www.vdorst.com> Sender: netdev-owner@vger.kernel.org To: =?iso-8859-1?Q?Ren=E9?= van Dorst Cc: Nelson Chang , Frank Wunderlich , netdev@vger.kernel.org, Sean Wang , linux-mips@vger.kernel.org, linux-mediatek@lists.infradead.org, John Crispin , Matthias Brugger , Stefan Roese , "David S . Miller" , linux-arm-kernel@lists.infradead.org List-Id: linux-mediatek@lists.infradead.org Hi Rene, On Thu, Aug 22, 2019 at 07:50:33PM +0000, René van Dorst wrote: > Quoting Russell King - ARM Linux admin : > > 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