linux-kernel - Re: [PATCH 2/6] mfd: hi6421-pmic: move hi6421_regmap

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Message-ID: <CAFGCpxxiwevKqJ19v7fFe6SA9HUbDsdoiL3nOKrkRLmg2=U2xw@mail.gmail.com>
Date:   Sat, 27 May 2017 11:08:29 +0800
From:   Guodong Xu <guodong.xu@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Wei Xu <xuwei5@...ilicon.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Gregory CLEMENT <gregory.clement@...e-electrons.com>,
        Olof Johansson <olof@...om.net>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Riku Voipio <riku.voipio@...aro.org>,
        Thierry Reding <treding@...dia.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Eric Anholt <eric@...olt.net>, damm+renesas@...nsource.se,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "hw Wang(Xiaoyin)" <hw.wangxiaoyin@...ilicon.com>
Subject: Re: [PATCH 2/6] mfd: hi6421-pmic: move hi6421_regmap_config
 definition to header file

On Fri, May 26, 2017 at 4:33 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Fri, May 26, 2017 at 8:35 AM, Guodong Xu <guodong.xu@...aro.org> wrote:
>> Move hi6421_regmap_config definition from c code to common header:
>>  - include/linux/mfd/hi6421-pmic.h
>>
>> This is to improve code re-use for upcoming hi6421 series of MFD driver.
>>
>> Signed-off-by: Guodong Xu <guodong.xu@...aro.org>
>
>> diff --git a/include/linux/mfd/hi6421-pmic.h b/include/linux/mfd/hi6421-pmic.h
>> index 587273e..f4674ff 100644
>> --- a/include/linux/mfd/hi6421-pmic.h
>> +++ b/include/linux/mfd/hi6421-pmic.h
>> @@ -38,4 +38,10 @@ struct hi6421_pmic {
>>         struct regmap           *regmap;
>>  };
>>
>> +static const struct regmap_config hi6421_regmap_config = {
>> +       .reg_bits = 32,
>> +       .reg_stride = 4,
>> +       .val_bits = 8,
>> +       .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
>> +};
>>  #endif         /* __HI6421_PMIC_H */
>
> Header files should not have static variables in general, it will cause warnings
> about unused variables when you include the header from another file
> (depending on compiler version and warning options, I think older gcc
> versions don't warn about this, but clang and latest gcc do).
>

I will fix that.

> How about adding the new code into the existing
> drivers/mfd/hi6421-pmic-core.c file, and splitting out the part that differs
> (the regmap_update_bits is the only difference I see)

Yes, indeed.

> into a callback
> that you reference through the of_device_id->data pointer?
>

Thanks Arnd. I will look into this. I'll drop hi6421v530-pmic.c and
resend this patchset.

-Guodong

>         Arnd