netdev - Re: [PATCH v2 net-next 4/4] net: dsa: validate that DT nodes of shared ports have the properties they need

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Date:   Mon, 1 Aug 2022 14:11:25 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Rob Herring <robh+dt@...nel.org>
CC:     netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Christian Marangi <ansuelsmth@...il.com>,
        John Crispin <john@...ozen.org>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Mans Rullgard <mans@...sr.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        George McCollister <george.mccollister@...il.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Aleksander Jan Bajkowski <olek2@...pl>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Pawel Dembicki <paweldembicki@...il.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Marek Behún <kabel@...nel.org>,
        Marcin Wojtas <mw@...ihalf.com>,
        Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH v2 net-next 4/4] net: dsa: validate that DT nodes of
 shared ports have the properties they need

On Mon, Aug 01, 2022 at 08:02:56AM -0600, Rob Herring wrote:
> > +if:
> > +  oneOf:
> > +    - properties:
> > +        ethernet:
> > +          items:
> > +            $ref: /schemas/types.yaml#/definitions/phandle
> > +    - properties:
> > +        link:
> > +          items:
> > +            $ref: /schemas/types.yaml#/definitions/phandle-array
> 
> 'items' here is wrong. 'required' is needed because the property not
> present will be true otherwise.
> 
> Checking the type is redundant given the top-level schema already does that.

Excuse me, but I don't understand. I verified this and it works as
expected - if the property is present, the 'items' evaluates to true,
otherwise to false.

Could you suggest an alternative way of checking whether the 'ethernet'
or 'link' properties are present, as part of a conditional?

> > I have deliberately made this part of dsa-port.yaml and not depend on
> > any compatible string. The reason is the code - we'll warn about missing
> > properties regardless of whether we have fallback logic for some older
> > switches. Essentially the fact that some switches have the fallback to
> > not use phylink will remain an undocumented easter egg as far as the
> > dt-schema is concerned.
> 
> dsa-port.yaml is only applied when some other schema references it
> which is probably based on some compatible. If you want to apply this
> under some other condition, then you need a custom 'select' schema to
> define when.

No, this is good, I think. I got a "build warning" from your bot which
found the DSA examples which had missing required properties, so I think
it works the way I indended it.