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

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Message-ID: <CAHp75VdfrJ3JV_gL3xCLHOiw6Tj-5Ep7z5JKWUFKFbUt8gobcw@mail.gmail.com>
Date:   Mon, 29 Mar 2021 13:39:44 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Brad Larson <brad@...sando.io>
Cc:     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

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
> >
> > 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

...

> > > +#include <linux/of.h>
> >
> > It's not used here, but you missed mod_devicetable.h.
>
> Removed <linux/of.h>.  There is no dependency on mod_devicetable.h.

What do you mean? You don't use data structures from that?
of_device_id or other ID structures are defined there. Your module
works without them?

...

> > > +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > +       p->base = devm_ioremap_resource(&pdev->dev, res);
> >
> > p->base = devm_platform_ioremap_resource(pdev, 0);
>
> Implementation follows devm_ioremap_resource() example in lib/devres.c.

So? How does this make it impossible to address my comment?

> > > +       if (IS_ERR(p->base)) {
> >
> > > +               dev_err(&pdev->dev, "failed to remap I/O memory\n");
> >
> > Duplicate noisy message.
> >
> > > +               return PTR_ERR(p->base);
> > > +       }

-- 
With Best Regards,
Andy Shevchenko