linux-kernel - Re: [PATCH 1/2] dtbindings: clock: Add bindings for Renesas PhiClock

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Date:   Thu, 17 Nov 2022 09:11:27 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Alex Helms <alexander.helms.jy@...esas.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
        robh+dt@...nel.org, sboyd@...nel.org, mturquette@...libre.com,
        geert+renesas@...der.be
Subject: Re: [PATCH 1/2] dtbindings: clock: Add bindings for Renesas PhiClock

On Thu, Nov 17, 2022 at 8:39 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
> On 16/11/2022 21:11, Alex Helms wrote:
> >>> +  clocks:
> >>> +    const: 1
> >>> +
> >>> +  compatible:
> >>> +    enum:
> >>> +      - renesas,9fgv1006
> >>> +
> >>> +  reg:
> >>> +    maxItems: 1
> >>> +
> >>> +  renesas,ss-amount-percent:
> >>> +    description: Spread spectrum absolute amount as hundredths of a percent, e.g. 150 is 1.50%.
> >>
> >> What? If this is percent then it cannot be hundreds of percent. Percent
> >> is percent. Use appropriate units.
> >> https://jpn01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fdevicetree-org%2Fdt-schema%2Fblob%2Fmain%2Fdtschema%2Fschemas%2Fproperty-units.yaml&amp;data=05%7C01%7Calexander.helms.jy%40renesas.com%7C9c13a32848f3434e217108dac7ab69f6%7C53d82571da1947e49cb4625a166a4a2a%7C0%7C0%7C638041836281252737%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=6MULpJhPyyjWSo1SvPCrz6KidE1VEtiiNYk1O5wS1vI%3D&amp;reserved=0
> >>
> >
> > Values like 0.5% or 2.5% must be representable which is why this
> > property is an integer of hundredths of percent. How else would you
> > represent a non-integer percent?
>
> With an appropriate unit.

Krzysztof really means the property should be named e.g.
"renesas,ss-amount-centipercent" instead.

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