netdev - Re: [RFC PATCH 0/6] Armada 38x comphy driver to support 2.5Gbps networking

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Date:   Wed, 14 Nov 2018 10:56:06 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Jason Cooper <jason@...edaemon.net>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>
Subject: Re: [RFC PATCH 0/6] Armada 38x comphy driver to support 2.5Gbps
 networking

On Wed, Nov 14, 2018 at 01:39:29PM +0530, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On 12/11/18 5:59 PM, Russell King - ARM Linux wrote:
> > Hi,
> > 
> > This series adds support for dynamically switching between 1Gbps
> > and 2.5Gbps networking for the Marvell Armada 38x SoCs, tested on
> > Armada 388 on the Clearfog platform.
> > 
> > This is necessary to be able to connect (eg) a Clearfog platform
> > with a Macchiatobin platform via the SFP sockets, as Clearfog
> > currently only supports 1Gbps networking via the SFP socket and
> > Macchiatobin defaults to 2.5Gbps when using Fiberchannel SFPs.
> > 
> > In order to allow dynamic switching, we need to implement a common
> > phy driver to switch the ethernet serdes lane speed - 2.5Gbps is
> > just 1Gbps up-clocked by 2.5x.  We implement a simple comphy
> > driver to achieve this, which only supports networking.
> > 
> > With this, we are able to support both Fiberchannel SFPs operating
> > at 2.5Gbps or 1Gbps, and 1G ethernet SFPs plugged into the Clearfog
> > platform, dynamically selecting according to the SFPs abilities.
> > 
> > I'm aware of the proposed changes to the PHY layer, changing
> > phy_set_mode() to take the ethernet phy interface type, hence why
> > this is RFC - there's also the question about how this will be
> > merged.  This series is currently based on 4.20-rc1, but will
> > likely need to be rebased when the PHY layer changes hit.
> 
> For this case, I'd prefer the phy_set_mode series and the phy and net changes
> here (after rebasing) go via linux-phy tree.

Please let me know when they've hit, thanks.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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