linux-kernel - Re: [PATCH v3 00/17] pinctrl: exynos/samsung: Add header with values used for configuration

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Message-ID: <CA+Ln22Eotn=dLyA8KYT_6Fnwvp1sTSxzP8DepAFB2P8EUMME6Q@mail.gmail.com>
Date:   Sun, 9 Oct 2016 16:04:11 +0900
From:   Tomasz Figa <tomasz.figa@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Kukjin Kim <kgene@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v3 00/17] pinctrl: exynos/samsung: Add header with values
 used for configuration

Hi Krzysztof,

2016-09-04 20:04 GMT+09:00 Krzysztof Kozlowski <krzk@...nel.org>:
>
> Hi,
>
> Changes since v2
> ================
> 1. Combine separate patchsets into one. Previously I sent separately the fixes
>    and changes for S3C platforms.
> 2. Fix issues pointed during review.
> 3. Add review tags.
>
> Changes since v1
> ================
> 1. Follow Arnd's suggestion about moving the macros to common place.
> 2. Subjects: replace "GPIO" with "pinctrl".
> 3. There were some major changes here so I did not add Javier's
>    reviewed-by and tested-by tags.
>
> Merging
> =======
> Patches #1 and #2 should probably go through pinctrl tree. In that case I would
> appreciate a stable branch/tag so DTS could base on top of it.
>
> Goal
> ====
> Increase readability:
>         uart0_data: uart0-data {
>                 samsung,pins = "gpa0-0", "gpa0-1";
> -               samsung,pin-function = <2>;
> -               samsung,pin-pud = <0>;
> -               samsung,pin-drv = <0>;
> +               samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
> +               samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
> +               samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;

I like the idea, thanks for cleaning this up. However I'd like to
bikeshed the prefix a bit. Since the properties are already prefixed
by "samsung,", I think it would make much more sense to also prefix
the generic values with "SAMSUNG_". Of course for soc/family-specific
values, the soc/family name prefix sounds right.

Similarly for rest of the value names, such as SAMSUNG_PIN_PUD instead
of SAMSUNG_PIN_PULL, which obviously sounds more like correct English,
however hurts the consistency and could confuse the people writing new
dts files.

Best regards,
Tomasz