linux-kernel - Re: [PATCH 23/23] Documentation: gpio: add documentation for gpio-mockup

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Date:   Mon, 7 Sep 2020 17:23:28 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Kent Gibson <warthog618@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Corbet <corbet@....net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        linux-doc <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 23/23] Documentation: gpio: add documentation for gpio-mockup

Hi Andy,

On Mon, Sep 7, 2020 at 4:14 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
> On Mon, Sep 07, 2020 at 03:49:23PM +0200, Bartosz Golaszewski wrote:
> > On Mon, Sep 7, 2020 at 2:22 PM Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > > On Mon, Sep 07, 2020 at 02:06:15PM +0200, Bartosz Golaszewski wrote:
>
> ...
>
> > > Yes it is.  Or at least until you fix all existing users so that if you
> > > do change it, no one notices it happening :)
> > >
> >
> > Then another question is: do we really want to commit to a stable ABI
> > for a module we only use for testing purposes and which doesn't
> > interact with any real hardware.
> >
> > Rewriting this module without any legacy cruft is tempting though. :)
>
> Another thought spoken loudly: maybe it can be unified with GPIO aggregator
> code? In that case it makes sense.

You want to aggregate GPIOs out of thin air?

>From DT, that would be something like

    gpios = <&gpio1 2>, <0>, <0>, <&gpio2, 5>;

?

For writing into ".../new_device", we could agree on something like "0"
means not backed by an existing GPIO?

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