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Message-ID: <20250407185129.654e7c9c@kmaincent-XPS-13-7390>
Date: Mon, 7 Apr 2025 18:51:29 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Sean Anderson <sean.anderson@...ux.dev>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew+netdev@...n.ch>, "David S .
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Russell King
 <linux@...linux.org.uk>, linux-kernel@...r.kernel.org, Christian Marangi
 <ansuelsmth@...il.com>, upstream@...oha.com, Heiner Kallweit
 <hkallweit1@...il.com>, Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>, Christophe Leroy
 <christophe.leroy@...roup.eu>, Clark Wang <xiaoning.wang@....com>, Claudiu
 Beznea <claudiu.beznea@...rochip.com>, Claudiu Manoil
 <claudiu.manoil@....com>, Conor Dooley <conor+dt@...nel.org>, Ioana Ciornei
 <ioana.ciornei@....com>, Jonathan Corbet <corbet@....net>, Joyce Ooi
 <joyce.ooi@...el.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Li Yang
 <leoyang.li@....com>, Madalin Bucur <madalin.bucur@....com>, Madhavan
 Srinivasan <maddy@...ux.ibm.com>, Maxime Coquelin
 <mcoquelin.stm32@...il.com>, Michael Ellerman <mpe@...erman.id.au>, Michal
 Simek <michal.simek@....com>, Naveen N Rao <naveen@...nel.org>, Nicholas
 Piggin <npiggin@...il.com>, Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Radhey Shyam Pandey <radhey.shyam.pandey@....com>, Rob Herring
 <robh+dt@...nel.org>, Rob Herring <robh@...nel.org>, Robert Hancock
 <robert.hancock@...ian.com>, Saravana Kannan <saravanak@...gle.com>, Shawn
 Guo <shawnguo@...nel.org>, UNGLinuxDriver@...rochip.com, Vladimir Oltean
 <vladimir.oltean@....com>, Wei Fang <wei.fang@....com>,
 devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC net-next PATCH 00/13] Add PCS core support

On Mon, 7 Apr 2025 12:33:28 -0400
Sean Anderson <sean.anderson@...ux.dev> wrote:

> On 4/7/25 12:27, Kory Maincent wrote:
> > On Thu,  3 Apr 2025 14:18:54 -0400
> > Sean Anderson <sean.anderson@...ux.dev> wrote:
> >   
> >> This series adds support for creating PCSs as devices on a bus with a
> >> driver (patch 3). As initial users,
> >> 
> >> - The Lynx PCS (and all of its users) is converted to this system (patch 5)
> >> - The Xilinx PCS is broken out from the AXI Ethernet driver (patches 6-8)
> >> - The Cadence MACB driver is converted to support external PCSs (namely
> >>   the Xilinx PCS) (patches 9-10).
> >> 
> >> The last few patches add device links for pcs-handle to improve boot times,
> >> and add compatibles for all Lynx PCSs.
> >> 
> >> Care has been taken to ensure backwards-compatibility. The main source
> >> of this is that many PCS devices lack compatibles and get detected as
> >> PHYs. To address this, pcs_get_by_fwnode_compat allows drivers to edit
> >> the devicetree to add appropriate compatibles.  
> > 
> > I don't dive into your patch series and I don't know if you have heard
> > about it but Christian Marangi is currently working on fwnode for PCS:
> > https://lore.kernel.org/netdev/20250406221423.9723-1-ansuelsmth@gmail.com
> > 
> > Maybe you should sync with him!  
> 
> I saw that series and made some comments. He is CC'd on this one.

Oh indeed, you have replied on his v1, sorry I missed it.
It seems he forgot to add you in CC in the v2.

> I think this approach has two advantages:
> 
> - It completely solves the problem of the PCS being unregistered while the
> netdev (or whatever) is up
> - I have designed the interface to make it easy to convert existing
>   drivers that may not be able to use the "standard" probing process
>   (because they have to support other devicetree structures for
>   backwards-compatibility).

Ok, thanks for the clarification!
I was working on the axienet driver to add support for the 10G version that's
why I discovered your series.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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