linux-kernel - Re: Old platforms: bring out your dead

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Message-ID: <CAMuHMdU3s9hvenrRFibggT=hGDfauhh2hPcN7f3E0uG-iVG7iw@mail.gmail.com>
Date:   Wed, 13 Jan 2021 09:15:56 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Gerhard Pircher <gerhard_pircher@....net>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Sparc kernel list <sparclinux@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: Old platforms: bring out your dead

Hi Linus,

On Wed, Jan 13, 2021 at 4:20 AM Linus Walleij <linus.walleij@...aro.org> wrote:
> On Tue, Jan 12, 2021 at 3:45 PM John Paul Adrian Glaubitz
> <glaubitz@...sik.fu-berlin.de> wrote:
> That said there are a three things that people should really be doing if they
> want to keep their pet archs/subarchs around as good community
> members, and they are in essence to:

> 2. Migrate existing drivers to newly appeared and
>     appropriate subsystems (I think there are some hacky heartbeat LED
>     drivers down in arch/* for example) there is also the feature matrix
>     core maintainers like and which appears if you type
>     Documentation/features/list-arch.sh <archname>
>     would be nice if you work on them if you can support them!
>     Or at least take a look.

The choir is listening ;-)

For Amiga, that would require writing a real GPIO driver (modifying
gpio-mmio?) for the CIAs, and converting its users (amiflop, amijoy,
amimouse, parport_amiga, amiserial, and dmasound_paula) from direct CIA
register access to GPIO access (mctrl_gpio for amiserial)).
Note that the heartbeat LED is shared by heartbeat and audio.

An interim solution might be to just write a simple gpio driver for the
single CIA pin driving the heartbeat LED, allowing the user to set up
ledtrig-heartbeat.

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