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

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Date:   Mon, 10 Oct 2016 02:49:01 +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

2016-10-10 1:39 GMT+09:00 Krzysztof Kozlowski <krzk@...nel.org>:
> On Sun, Oct 09, 2016 at 04:04:11PM +0900, Tomasz Figa wrote:
>> 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.
>
> I am lost. Sorry, I don't get what kind of final prefixes you would like
> to have.
>
> SAMSUNG_EXYNOS4_PIN_DRV_LV1
> SAMSUNG_EXYNOS5260_PIN_DRV_LV1
> ?

For SoC-specific definitions:

EXYNOS4_PIN_DRV_LV1
EXYNOS5260_PIN_DRV_LV1

>
>> 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.
>
> SAMSUNG_S3C64XX_PIN_PUD_NONE
> SAMSUNG_EXYNOS_PIN_PUD_NONE

For definitions common for the whole Samsung pinctrl driver:

SAMSUNG_PIN_PUD_NONE

...

But actually I think I missed the fact that there is almost no common
definitions. Is that correct? Was that the missing part of my
understanding?

Best regards,
Tomasz