linux-kernel - Re: [PATCH v2 2/4] media: dt-bindings: Document Renesas RZ/G2L CRU block

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Date:   Thu, 22 Sep 2022 16:46:15 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 2/4] media: dt-bindings: Document Renesas RZ/G2L CRU
 block

On Wed, Sep 21, 2022 at 08:58:26PM +0200, Krzysztof Kozlowski wrote:
> On 21/09/2022 19:29, Laurent Pinchart wrote:
> >>>>> +  clock-names:
> >>>>> +    items:
> >>>>> +      - const: vclk
> >>>>> +      - const: pclk
> >>>>> +      - const: aclk
> >>>>
> >>>> Drop the "clk" suffixes. Remaining names could be made a bit more readable.
> >>>
> >>> These names come from the documentation, isn't it better to match the
> >>> datasheet ?
> >>
> >> If datasheet calls it "vclk_really_clk_it_is_clk_clk", it's not the
> >> reason to use it. :)
> >>
> >> The "clk" is redundant even if the hardware engineer thought different.
> >>
> >> The same for IRQs ("tx" not "txirq"), for dmas ("tx" not "txdma").
> > 
> > I'd argue that naming clocks "v", "p" and "a" would be less readable and
> > more confusing. Is this a new rule ?
> 
> Not really, but also it's only a style issue.
> 
> Indeed "v" and "p" are not much better... but still "vclk" does not
> bring any additional information over "v". It's redundant.
> 
> You can also drop entire entry - unless it helps in particular
> implementation.

There are multiple clocks, so I think names are better than indices. If
you really insist we could name them "v", "p" and "a", but I think the
clk suffix here improves readability. If those clocks were named
"videoclk", "pixelclk" and "axiclk" I'd be fine dropping the suffix, but
that's not the case here.

> https://lore.kernel.org/all/20220517175958.GA1321687-robh@kernel.org/
> https://lore.kernel.org/all/20210815133926.22860-1-biju.das.jz@bp.renesas.com/
> https://lore.kernel.org/all/YYFCaHI%2FDASUz+Vu@robh.at.kernel.org/
> https://lore.kernel.org/all/20220830182540.GA1797396-robh@kernel.org/

-- 
Regards,

Laurent Pinchart