linux-kernel - Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus

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Message-ID: <ZQHcV5DUfcCYkkTi@shell.armlinux.org.uk>
Date:   Wed, 13 Sep 2023 16:59:19 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Daniel Golle <daniel@...rotopia.org>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, mithat.guner@...ont.com,
        erkin.bozoglu@...ont.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/4] dt-bindings: net: dsa: document internal MDIO bus

On Wed, Sep 13, 2023 at 10:42:31AM +0300, Vladimir Oltean wrote:
> On Wed, Sep 13, 2023 at 08:52:37AM +0300, Arınç ÜNAL wrote:
> > On 12.09.2023 22:34, Vladimir Oltean wrote:
> > > On Tue, Sep 12, 2023 at 10:23:51PM +0300, Arınç ÜNAL wrote:
> > > > The phylink bindings for user ports I ended up making by looking up the
> > > > existing devicetrees are different than the phylink bindings for the shared
> > > > (CPU and DSA) ports currently enforced on all switches.
> > > > 
> > > > My phylink bindings for user ports:
> > > > 
> > > >              allOf:
> > > >                - anyOf:
> > > >                    - required: [ fixed-link ]
> > > >                    - required: [ phy-handle ]
> > > >                    - required: [ managed ]
> > > > 
> > > >                - if:
> > > >                    required: [ fixed-link ]
> > > >                  then:
> > > >                    not:
> > > >                      required: [ managed ]
> > > 
> > > Right, it should have been anyOf and not oneOf.. my mistake. It is a bug
> > > which should be fixed. It's the same phylink that gets used in both cases,
> > > user ports and shared ports :)
> > 
> > One more thing, I don't recall phy-mode being required to be defined for
> > user ports as it will default to GMII. I don't believe this is the same
> > case for shared ports so phy-mode is required only for them?
> 
> phy-mode is not strictly required, but I think there is a strong
> preference to set it. IIRC, when looking at the DSA device trees, there
> was no case where phy-mode would be absent on CPU/DSA ports if the other
> link properties were also present, so we required it too. There were no
> complaints in 1 year since dsa_shared_port_validate_of() is there. The
> requirement can be relaxed to just a warning and no error in the kernel,
> and the removal of "required" in the schema, if it helps making it
> common with user ports.

However, phylink pretty much requires phy-mode to be specified to be
something sane for shared ports, so I wouldn't be in favour of relaxing
the checkinng in dsa_shared_port_validate_of()... not unless you're
now going to accept the approach I originally proposed to have DSA
drivers tell the core (and thus phylink) what phy-mode and other link
parameters should be used when they are missing from DT.

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