linux-kernel - Re: [PATCH 1/8] gpio: Add Elba SoC gpio driver for spi cs control

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Message-ID: <CAMuHMdUz4vUQzXBHA9AiT3w6L20yBpgd0emVZJb=v_qw70qiJQ@mail.gmail.com>
Date:   Mon, 23 Aug 2021 09:50:16 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Brad Larson <brad@...sando.io>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Olof Johansson <olof@...om.net>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/8] gpio: Add Elba SoC gpio driver for spi cs control

Hi Brad,

On Mon, Aug 23, 2021 at 3:14 AM Brad Larson <brad@...sando.io> wrote:
> On Mon, Mar 29, 2021 at 3:40 AM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> >
> > On Mon, Mar 29, 2021 at 4:19 AM Brad Larson <brad@...sando.io> wrote:
> > > On Sun, Mar 7, 2021 at 11:21 AM Andy Shevchenko
> > > <andy.shevchenko@...il.com> wrote:
> > > > On Thu, Mar 4, 2021 at 4:40 PM Brad Larson <brad@...sando.io> wrote:
> >
> > ...
> >
> > > > > +config GPIO_ELBA_SPICS
> > > > > +       bool "Pensando Elba SPI chip-select"
> > > >
> > > > Can't it be a module? Why?
> > >
> > > All Elba SoC based platforms require this driver to be built-in to boot and
> > > removing the module would result in a variety of exceptions/errors.
> >
> > Needs to be at least in the commit message.
> >
> > > > > +       depends on ARCH_PENSANDO_ELBA_SOC
> > > > > +       help
> > > > > +         Say yes here to support the Pensndo Elba SoC SPI chip-select driver

Pensando

> > > >
> > > > Please give more explanation what it is and why users might need it,
> > > > and also tell users how the module will be named (if there is no
> > > > strong argument why it can't be a  module).
> > > >
> > > Fixed the typo.
> >
> > Yeah, according to the above, you better elaborate what this module is
> > and why people would need it.
> > Also can be a good hint to add
> > default ARCH_MY_COOL_PLATFORM
>
> Regarding the above module question and Kconfig definition, since I
> first looked at this and reviewed the comments I realized I should be
> using builtin.  The file gpio/Kconfig is currently this
>
> config GPIO_ELBA_SPICS
>         def_bool y
>         depends on ARCH_PENSANDO_ELBA_SOC || COMPILE_TEST

That means the driver will default to yes by merely enabling
COMPILE_TEST, which is a no-go.

    config GPIO_ELBA_SPICS
            bool "one-line summary"
            depends on ARCH_PENSANDO_ELBA_SOC || COMPILE_TEST
            default y if ARCH_PENSANDO_ELBA_SOC

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