netdev - Re: [PATCH net-next 3/3] dt-bindings: net: ethernet: Update mt7622 docs and dts to reflect the new phylink API

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Date:   Fri, 26 Jul 2019 14:19:05 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     René van Dorst <opensource@...rst.com>,
        netdev@...r.kernel.org, frank-w@...lic-files.de,
        sean.wang@...iatek.com, f.fainelli@...il.com, davem@...emloft.net,
        matthias.bgg@...il.com, vivien.didelot@...il.com, john@...ozen.org,
        linux-mediatek@...ts.infradead.org, linux-mips@...r.kernel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] dt-bindings: net: ethernet: Update mt7622
 docs and dts to reflect the new phylink API

On Fri, Jul 26, 2019 at 03:16:04PM +0200, Andrew Lunn wrote:
> Are you sure it is using SGMII and not 2500BaseX? Can you get access
> to the signalling word? SGMII is supposed to indicate to the MAC what
> speed it is using, via inband signalling. So there should not be any
> need for a fixed-link. 2500BaseX however does not have such
> signalling, so there would need to be a fixed link.
> 
> Maybe we should really consider what phy-mode = "sgmii"; means. Should
> this include the overclocked 2.5G speed, or should we add a 2500sgmii
> link mode?

Note that Documentation/networking/phy.rst now contains definitions
for SGMII, 1000BASE-X and 2500BASE-X.

-- 
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