linux-kernel - Re: [PATCH] drm/st7735r: Fix module autoloading for Okaya RH128128T

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Message-ID: <CAMuHMdVmFGjGbHz1yo7tOzqtUbMTDkUxaMo2fVSp1HMU=_1emA@mail.gmail.com>
Date:   Fri, 20 May 2022 14:02:11 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        David Lechner <david@...hnology.com>,
        Sam Ravnborg <sam@...nborg.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Mark Brown <broonie@...nel.org>,
        linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH] drm/st7735r: Fix module autoloading for Okaya RH128128T

Hi Javier,

CC spi

On Fri, May 20, 2022 at 11:16 AM Javier Martinez Canillas
<javierm@...hat.com> wrote:
> The SPI core always reports a "MODALIAS=spi:<foo>", even if the device was
> registered via OF. This means that the st7735r.ko module won't autoload if
> a DT has a node with a compatible "okaya,rh128128t" string.
>
> In that case, kmod expects a "MODALIAS=of:N*T*Cokaya,rh128128t" uevent but
> instead will get a "MODALIAS=spi:rh128128t", which is not present in the
> list of aliases:
>
>   $ modinfo drivers/gpu/drm/tiny/st7735r.ko | grep alias
>   alias:          of:N*T*Cokaya,rh128128tC*
>   alias:          of:N*T*Cokaya,rh128128t
>   alias:          of:N*T*Cjianda,jd-t18003-t01C*
>   alias:          of:N*T*Cjianda,jd-t18003-t01
>   alias:          spi:jd-t18003-t01
>
> To workaround this issue, add in the SPI table an entry for that device.
>
> Fixes: d1d511d516f7 ("drm: tiny: st7735r: Add support for Okaya RH128128T")
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>

Thanks for your patch!
We really need to fix this at the subsystem level.

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>


> --- a/drivers/gpu/drm/tiny/st7735r.c
> +++ b/drivers/gpu/drm/tiny/st7735r.c
> @@ -174,6 +174,7 @@ MODULE_DEVICE_TABLE(of, st7735r_of_match);
>
>  static const struct spi_device_id st7735r_id[] = {
>         { "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg },
> +       { "rh128128t", (uintptr_t)&rh128128t_cfg },
>         { },
>  };
>  MODULE_DEVICE_TABLE(spi, st7735r_id);

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