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From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: "René van Dorst" <opensource@vdorst.com>
Cc: Nelson Chang <nelson.chang@mediatek.com>,
	Frank Wunderlich <frank-w@public-files.de>,
	netdev@vger.kernel.org, Sean Wang <sean.wang@mediatek.com>,
	linux-mips@vger.kernel.org, linux-mediatek@lists.infradead.org,
	John Crispin <john@phrozen.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Stefan Roese <sr@denx.de>,
	"David S . Miller" <davem@davemloft.net>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH net-next v2 2/3] net: ethernet: mediatek: Re-add support SGMII
Date: Thu, 22 Aug 2019 22:11:56 +0100	[thread overview]
Message-ID: <20190822211156.GV13294@shell.armlinux.org.uk> (raw)
In-Reply-To: <20190822195033.Horde.hEW8FBGNfFrugQOCv0gaDfx@www.vdorst.com>

Hi Rene,

On Thu, Aug 22, 2019 at 07:50:33PM +0000, René van Dorst wrote:
> Quoting Russell King - ARM Linux admin <linux@armlinux.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

WARNING: multiple messages have this Message-ID (diff)
From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: "René van Dorst" <opensource@vdorst.com>
Cc: Nelson Chang <nelson.chang@mediatek.com>,
	Frank Wunderlich <frank-w@public-files.de>,
	netdev@vger.kernel.org, Sean Wang <sean.wang@mediatek.com>,
	linux-mips@vger.kernel.org, linux-mediatek@lists.infradead.org,
	John Crispin <john@phrozen.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Stefan Roese <sr@denx.de>,
	"David S . Miller" <davem@davemloft.net>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH net-next v2 2/3] net: ethernet: mediatek: Re-add support SGMII
Date: Thu, 22 Aug 2019 22:11:56 +0100	[thread overview]
Message-ID: <20190822211156.GV13294@shell.armlinux.org.uk> (raw)
In-Reply-To: <20190822195033.Horde.hEW8FBGNfFrugQOCv0gaDfx@www.vdorst.com>

Hi Rene,

On Thu, Aug 22, 2019 at 07:50:33PM +0000, René van Dorst wrote:
> Quoting Russell King - ARM Linux admin <linux@armlinux.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

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2019-08-22 21:12 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-21 14:43 [PATCH net-next v2 0/3] net: ethernet: mediatek: convert to PHYLINK René van Dorst
2019-08-21 14:43 ` René van Dorst
2019-08-21 14:43 ` [PATCH net-next v2 1/3] net: ethernet: mediatek: Add basic PHYLINK support René van Dorst
2019-08-21 14:43   ` René van Dorst
2019-08-22 14:27   ` Russell King - ARM Linux admin
2019-08-22 14:27     ` Russell King - ARM Linux admin
2019-08-22 15:11     ` René van Dorst
2019-08-22 15:11       ` René van Dorst
2019-08-21 14:43 ` [PATCH net-next v2 2/3] net: ethernet: mediatek: Re-add support SGMII René van Dorst
2019-08-21 14:43   ` René van Dorst
2019-08-22 14:44   ` Russell King - ARM Linux admin
2019-08-22 14:44     ` Russell King - ARM Linux admin
2019-08-22 19:50     ` René van Dorst
2019-08-22 19:50       ` René van Dorst
2019-08-22 21:11       ` Russell King - ARM Linux admin [this message]
2019-08-22 21:11         ` Russell King - ARM Linux admin
2019-08-21 14:43 ` [PATCH net-next v2 3/3] dt-bindings: net: ethernet: Update mt7622 docs and dts to reflect the new phylink API René van Dorst
2019-08-21 14:43   ` René van Dorst
2019-08-27 21:51   ` Rob Herring
2019-08-27 21:51     ` Rob Herring

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