linux-kernel - Re: [PATCH 2/3] dt-bindings: i2c: renesas,rzv2m: Fix SoC specific string

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Date:   Fri, 4 Nov 2022 09:55:30 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Wolfram Sang <wsa@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo@...ndi.org>
Subject: Re: [PATCH 2/3] dt-bindings: i2c: renesas,rzv2m: Fix SoC specific string

Hi Krzysztof,

On Fri, Nov 4, 2022 at 2:48 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
> On 03/11/2022 19:06, Fabrizio Castro wrote:
> > s/renesas,i2c-r9a09g011/renesas,r9a09g011-i2c/g for consistency.
> >
> > renesas,i2c-r9a09g011 is not actually used by the driver, therefore
> > changing this doesn't cause any harm.
>
> And what about other users of DTS? One chosen driver implementation
> might not be enough...
>
> >
> > Fixes: ba7a4d15e2c4 ("dt-bindings: i2c: Document RZ/V2M I2C controller")
>
> You need to explain the bug - where is the issue, how it affects users.
> Otherwise it is not a bug and there is nothing to fix.

Yep.

    The preferred form is "<vendor>,<family>-<module>", blah blah ...

> > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> > ---
> >  Documentation/devicetree/bindings/i2c/renesas,rzv2m.yaml | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/i2c/renesas,rzv2m.yaml b/Documentation/devicetree/bindings/i2c/renesas,rzv2m.yaml
> > index c46378efc123..92e899905ef8 100644
> > --- a/Documentation/devicetree/bindings/i2c/renesas,rzv2m.yaml
> > +++ b/Documentation/devicetree/bindings/i2c/renesas,rzv2m.yaml
> > @@ -16,7 +16,7 @@ properties:
> >    compatible:
> >      items:
> >        - enum:
> > -          - renesas,i2c-r9a09g011  # RZ/V2M
> > +          - renesas,r9a09g011-i2c  # RZ/V2M
>
> No.
>
> Deprecate instead old compatible. There are already users of it, at
> least in kernel. Not sure about other OS/bootloaders/firmwares.

As stated in the cover letter:

    Since it's early days for r9a09g011.dtsi, and compatible
    renesas,i2c-r9a09g011 isn't being actively used at the moment,
    I think it's safe to change to make compatible strings less
    confusing.

The bindings entered in v6.0.
The first user in the kernel is not yet in a released kernel, it will
be in v6.1. So it can still be fixed in v6.1...
Even if we don't fix it before v6.2, I don't think there is much harm in
making this change.

With the patch description improved:
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds