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

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Date:   Wed, 21 Nov 2018 15:11:00 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
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

Hi Russell,

On 14/11/18 4:26 PM, Russell King - ARM Linux wrote:
> 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.

I've merged the phy_set_mode series to linux-phy -next.

Thanks
Kishon
>