linux-kernel - Re: [PATCH 2/3] RFC: dt-bindings: marvell: Rewrite in schema

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Message-ID: <20231013141817.GB3793553-robh@kernel.org>
Date:   Fri, 13 Oct 2023 09:18:17 -0500
From:   Rob Herring <robh@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Christian Marangi <ansuelsmth@...il.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] RFC: dt-bindings: marvell: Rewrite in schema

On Fri, Oct 13, 2023 at 03:04:10PM +0200, Linus Walleij wrote:
> Hi Andrew,
> 
> thanks for reviewing!
> 
> On Fri, Oct 13, 2023 at 2:43 PM Andrew Lunn <andrew@...n.ch> wrote:
> 
> > > +properties:
> > > +  compatible:
> > > +    oneOf:
> > > +      - enum:
> > > +          - marvell,mv88e6060
> >
> > The 6060 is a separate driver. Its not part of mv88e6xxx. So it should
> > have a binding document of its own.
> 
> It really doesn't matter to the DT bindings.
> It is not the job of DT to reflect the state of Linux.
> 
> In another operating system they might all be the same driver.
> Or all four variants have their own driver.
> 
> If the hardware is distinctly different so a lot of the properties
> are unique then it may be warranted with a separate DT
> binding, for the sake of keeping bindings simpler and
> coherent.

Exactly.

> 
> > > +  '#interrupt-cells':
> > > +    description: The internal interrupt controller only supports triggering
> > > +      on IRQ_TYPE_LEVEL_HIGH
> > > +      # FIXME: what is this? this should be one cell should it not?
> > > +      # the Linux mv88e6xxx driver does not implement .irq_set_type in its irq_chip
> > > +      # so at least in that implementation the type is flat out ignored.
> > > +    const: 2
> >
> > This interrupt controller is for the embedded PHYs. Its is hard wired
> > active high.
> 
> Hmm.... I need feedback from the DT people here. It does have a
> polarity, but the polarity cannot be changed. So shall we encode this
> always the same polarity in the flags cell or skip it altogether?
> 
> I'm uncertain. The currens scheme does reflect a reality.

Either way is fine. If users are already doing 2 cells, then I'd 
probably just keep that and state that the flags cell is ignored/unused.

Rob