linux-kernel - Re: [PATCH v3 5/7] (WIP) drm/solomon: Add SSD130X OLED displays SPI support

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Message-ID: <CAMuHMdXsAyp18ivtSe-ZVmu6xbBBnvjMuZ=H1w9Gk=Ys4rkCeg@mail.gmail.com>
Date:   Wed, 9 Feb 2022 17:25:03 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Maxime Ripard <maxime@...no.tech>,
        Noralf Trønnes <noralf@...nnes.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH v3 5/7] (WIP) drm/solomon: Add SSD130X OLED displays SPI support

Hi Javier,

On Wed, Feb 9, 2022 at 5:07 PM Javier Martinez Canillas
<javierm@...hat.com> wrote:
> On 2/9/22 16:17, Andy Shevchenko wrote:
> > On Wed, Feb 09, 2022 at 01:25:46PM +0100, Geert Uytterhoeven wrote:
> >> On Wed, Feb 9, 2022 at 10:12 AM Javier Martinez Canillas
> >> <javierm@...hat.com> wrote:
> >
> > ...
> >
> >>> +               .compatible = "solomon,ssd1305fb-spi",
> >>
> >> This needs an update to the DT bindings.
> >> Hence this may be a good time to deprecate the existing
> >> "solomon,ssd130*fb-i2c" compatible values, and switch to
> >> "solomon,ssd130*fb" instead, for both I2C and SPI.
> >
> > Agree!
> >
>
> Did you see my comment about automatic module loading ? I think
> that would be an issue if we use the same compatible for both
> I2C and SPI drivers.

We have several drivers that have a core and separate i2c and spi
wrappers, see e.g.

$ git grep -w ltc2947_of_match
drivers/hwmon/ltc2947-core.c:const struct of_device_id ltc2947_of_match[] = {
drivers/hwmon/ltc2947-core.c:EXPORT_SYMBOL_GPL(ltc2947_of_match);
drivers/hwmon/ltc2947-core.c:MODULE_DEVICE_TABLE(of, ltc2947_of_match);
drivers/hwmon/ltc2947-i2c.c:            .of_match_table = ltc2947_of_match,
drivers/hwmon/ltc2947-spi.c:            .of_match_table = ltc2947_of_match,
drivers/hwmon/ltc2947.h:extern const struct of_device_id ltc2947_of_match[];

Are they all broken?

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