Message-ID: <b5c3a2d0-da1a-4333-a749-64a79acb5b44@csgroup.eu>
Date: Sat, 15 Nov 2025 13:55:00 +0100
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>, davem@...emloft.net
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, thomas.petazzoni@...tlin.com,
 Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 Russell King <linux@...linux.org.uk>, linux-arm-kernel@...ts.infradead.org,
 Herve Codina <herve.codina@...tlin.com>,
 Florian Fainelli <f.fainelli@...il.com>,
 Heiner Kallweit <hkallweit1@...il.com>,
 Vladimir Oltean <vladimir.oltean@....com>,
 Köry Maincent <kory.maincent@...tlin.com>,
 Marek Behún <kabel@...nel.org>,
 Oleksij Rempel <o.rempel@...gutronix.de>,
 Nicolò Veronese <nicveronese@...il.com>,
 Simon Horman <horms@...nel.org>, mwojtas@...omium.org,
 Antoine Tenart <atenart@...nel.org>, devicetree@...r.kernel.org,
 Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 Romain Gantois <romain.gantois@...tlin.com>,
 Daniel Golle <daniel@...rotopia.org>,
 Dimitri Fedrau <dimitri.fedrau@...bherr.com>
Subject: Re: [PATCH net-next v16 00/15] net: phy: Introduce PHY ports
 representation



Le 13/11/2025 à 09:14, Maxime Chevallier a écrit :
> Hi everyone,
> 
> This is v16 of the phy_port work. Changes are typos, a more relaxed
> check when parsing DT pairs, and binding updates. Thanks a lot to Andrew
> and Rob for the reviews on the last round.
> 
> This series conflicts with Romain's series on fiber support for dp83869:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fall%2F20251110-sfp-1000basex-v2-0-dd5e8c1f5652%40bootlin.com%2F&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cc3434ae46bd540e2e87708de228ca8e0%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638986184692158446%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=fbKgJgNn%2FaI%2BH3p9hjlVl7sQnVRtVtoFA3DEzKborUU%3D&reserved=0
> 
> As a remainder, a few important notes :
> 
>   - This is only a first phase. It instantiates the port, and leverage
>     that to make the MAC <-> PHY <-> SFP usecase simpler.
> 
>   - Next phase will deal with controlling the port state, as well as the
>     netlink uAPI for that.
> 
>   - The end-goal is to enable support for complex port MUX. This
>     preliminary work focuses on PHY-driven ports, but this will be
>     extended to support muxing at the MII level (Multi-phy, or compo PHY
>     + SFP as found on Turris Omnia for example).
> 
>   - The naming is definitely not set in stone. I named that "phy_port",
>     but this may convey the false sense that this is phylib-specific.
>     Even the word "port" is not that great, as it already has several
>     different meanings in the net world (switch port, devlink port,
>     etc.). I used the term "connector" in the binding.
> 
> A bit of history on that work :
> 
> The end goal that I personnaly want to achieve is :
> 
>              + PHY - RJ45
>              |
>   MAC - MUX -+ PHY - RJ45
> 
> After many discussions here on netdev@, but also at netdevconf[1] and
> LPC[2], there appears to be several analoguous designs that exist out
> there.
> 
> [1] : https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fnetdevconf.info%2F0x17%2Fsessions%2Ftalk%2Fimproving-multi-phy-and-multi-port-interfaces.html&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cc3434ae46bd540e2e87708de228ca8e0%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638986184692180471%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=HJZwQP6qPup6YH1XU4WOmMY%2BLekJdvClUFIoT4ieC8s%3D&reserved=0
> [2] : https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flpc.events%2Fevent%2F18%2Fcontributions%2F1964%2F&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cc3434ae46bd540e2e87708de228ca8e0%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638986184692199016%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=GfYNvE46zApzJzglRQ5xmrpVnbnFF2Q7ZkvDY84evos%3D&reserved=0 (video isn't the
> right one)
> 
> Take the MAchiatobin, it has 2 interfaces that looks like this :
> 
>   MAC - PHY -+ RJ45
>              |
> 	    + SFP - Whatever the module does
> 
> Now, looking at the Turris Omnia, we have :
> 
> 
>   MAC - MUX -+ PHY - RJ45
>              |
> 	    + SFP - Whatever the module does
> 
> We can find more example of this kind of designs, the common part is
> that we expose multiple front-facing media ports. This is what this
> current work aims at supporting. As of right now, it does'nt add any
> support for muxing, but this will come later on.
> 
> This first phase focuses on phy-driven ports only, but there are already
> quite some challenges already. For one, we can't really autodetect how
> many ports are sitting behind a PHY. That's why this series introduces a
> new binding. Describing ports in DT should however be a last-resort
> thing when we need to clear some ambiguity about the PHY media-side.
> 
> The only use-cases that we have today for multi-port PHYs are combo PHYs
> that drive both a Copper port and an SFP (the Macchiatobin case). This
> in itself is challenging and this series only addresses part of this
> support, by registering a phy_port for the PHY <-> SFP connection. The
> SFP module should in the end be considered as a port as well, but that's
> not yet the case.
> 
> However, because now PHYs can register phy_ports for every media-side
> interface they have, they can register the capabilities of their ports,
> which allows making the PHY-driver SFP case much more generic.
> 
> Let me know what you think, I'm all in for discussions :)
> 
> Regards,

For the series:

Tested-by: Christophe Leroy <christophe.leroy@...roup.eu>


> 
> Changes in v16:
>   - From Andrew, relaxed the check on the number of pairs so that we only
>     fail when baseT is missing pairs
>   - Add a check for either 1, 2 or 4 pairs
>   - Lots of typos (mostly lanes -> pairs)
>   - Added Andrew's review tags (thanks again)
>   - From Rob, added an "else" statement in the ethernet-connector binding
>   - Changed the node name for ethernet connectors to be decimal
> 
> Changes in V15:
>   - Update bindings, docs and code to use pairs instead of lanes
>   - Make pairs only relevant for BaseT
> 
> Changes in V14:
>   - Fixed kdoc
>   - Use the sfp module_caps feature.
> 
> Changes in V13:
>   - Added phy_caps support for interface selection
>   - Aggregated tested-by tags
> 
> Changes in V12:
>   - Moved some of phylink's internal helpers to phy_caps for reuse in
>     phylib
>   - Fixed SFP interface selection
>   - Added Rob's review and changes in patch 6
> 
> Changes in V11:
>   - The ti,fiber-mode property was deprecated in favor of the
>     ethernet-connector binding
>   - The .attach_port was split into an MDI and an MII version
>   - I added the warning back in the AR8031 PHY driver
>   - There is now an init-time check on the number of lanes associated to
>     every linkmode, making sure the number of lanes is above or equal to
>     the minimum required
>   - Various typos were fixed all around
>   - We no longer use sfp_select_interface() for SFP interface validation
> 
> Changes in V10:
>   - Rebase on net-next
>   - Fix a typo reported by Köry
>   - Aggregate all reviews
>   - Fix the conflict on the qcom driver
> 
> Changes in V9:
>   - Removed maxItems and items from the connector binding
>   - Fixed a typo in the binding
> 
> Changes in V8:
>   - Added maxItems on the connector media binding
>   - Made sure we parse a single medium
>   - Added a missing bitwise macro
> 
> Changes in V7:
>   - Move ethtool_medium_get_supported to phy_caps
>   - support combo-ports, each with a given set of supported modes
>   - Introduce the notion of 'not-described' ports
> 
> Changes in V6:
> 
>   - Fixed kdoc on patch 3
>   - Addressed a missing port-ops registration for the Marvell 88x2222
>     driver
>   - Addressed a warning reported by Simon on the DP83822 when building
>     without CONFIG_OF_MDIO
> 
> Changes in V5 :
> 
>   - renamed the bindings to use the term "connector" instead of "port"
>   - Rebased, and fixed some issues reported on the 83822 driver
>   - Use phy_caps
> 
> Changes in V4 :
> 
>   - Introduced a kernel doc
>   - Reworked the mediums definitions in patch 2
>   - QCA807x now uses the generic SFP support
>   - Fixed some implementation bugs to build the support list based on the
>     interfaces supported on a port
> 
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> 
> Maxime
> 
> Maxime Chevallier (15):
>    dt-bindings: net: Introduce the ethernet-connector description
>    net: ethtool: Introduce ETHTOOL_LINK_MEDIUM_* values
>    net: phy: Introduce PHY ports representation
>    net: phy: dp83822: Add support for phy_port representation
>    dt-bindings: net: dp83822: Deprecate ti,fiber-mode
>    net: phy: Create a phy_port for PHY-driven SFPs
>    net: phy: Introduce generic SFP handling for PHY drivers
>    net: phy: marvell-88x2222: Support SFP through phy_port interface
>    net: phy: marvell: Support SFP through phy_port interface
>    net: phy: marvell10g: Support SFP through phy_port
>    net: phy: at803x: Support SFP through phy_port interface
>    net: phy: qca807x: Support SFP through phy_port interface
>    net: phy: Only rely on phy_port for PHY-driven SFP
>    net: phy: dp83822: Add SFP support through the phy_port interface
>    Documentation: networking: Document the phy_port infrastructure
> 
>   .../bindings/net/ethernet-connector.yaml      |  57 +++
>   .../devicetree/bindings/net/ethernet-phy.yaml |  18 +
>   .../devicetree/bindings/net/ti,dp83822.yaml   |   9 +-
>   Documentation/networking/index.rst            |   1 +
>   Documentation/networking/phy-port.rst         | 111 ++++++
>   MAINTAINERS                                   |   3 +
>   drivers/net/phy/Makefile                      |   2 +-
>   drivers/net/phy/dp83822.c                     |  78 ++--
>   drivers/net/phy/marvell-88x2222.c             |  94 ++---
>   drivers/net/phy/marvell.c                     |  92 ++---
>   drivers/net/phy/marvell10g.c                  |  52 +--
>   drivers/net/phy/phy-caps.h                    |   5 +
>   drivers/net/phy/phy-core.c                    |   6 +
>   drivers/net/phy/phy_caps.c                    |  65 ++++
>   drivers/net/phy/phy_device.c                  | 337 +++++++++++++++++-
>   drivers/net/phy/phy_port.c                    | 212 +++++++++++
>   drivers/net/phy/qcom/at803x.c                 |  77 ++--
>   drivers/net/phy/qcom/qca807x.c                |  72 ++--
>   include/linux/ethtool.h                       |  39 +-
>   include/linux/phy.h                           |  63 +++-
>   include/linux/phy_port.h                      |  99 +++++
>   include/uapi/linux/ethtool.h                  |  20 ++
>   net/ethtool/common.c                          | 268 ++++++++------
>   23 files changed, 1399 insertions(+), 381 deletions(-)
>   create mode 100644 Documentation/devicetree/bindings/net/ethernet-connector.yaml
>   create mode 100644 Documentation/networking/phy-port.rst
>   create mode 100644 drivers/net/phy/phy_port.c
>   create mode 100644 include/linux/phy_port.h
> 

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