linux-kernel - Re: [PATCH v7 0/6] gpio: Add GPIO Aggregator

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Date:   Wed, 20 May 2020 14:57:05 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jonathan Corbet <corbet@....net>,
        Harish Jenny K N <harish_kandiga@...tor.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Alexander Graf <graf@...zon.com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Phil Reid <preid@...ctromag.com.au>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Magnus Damm <magnus.damm@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        QEMU Developers <qemu-devel@...gnu.org>
Subject: Re: [PATCH v7 0/6] gpio: Add GPIO Aggregator

Hi Andy,

On Wed, May 20, 2020 at 2:41 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Wed, May 20, 2020 at 3:40 PM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > On Wed, May 20, 2020 at 3:38 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > On Wed, May 20, 2020 at 2:14 PM Andy Shevchenko
> > > <andriy.shevchenko@...el.com> wrote:
> > > > On Mon, May 11, 2020 at 04:52:51PM +0200, Geert Uytterhoeven wrote:
> >
> > ...
> >
> > > > Sorry for late reply, recently noticed this nice idea.
> > > > The comment I have is, please, can we reuse bitmap parse algorithm and syntax?
> > > > We have too many different formats and parsers in the kernel and bitmap's one
> > > > seems suitable here.
> > >
> > > Thank you, I wasn't aware of that.
> > >
> > > Which one do you mean? The documentation seems to be confusing,
> > > and incomplete.
> > > My first guess was bitmap_parse(), but that one assumes hex values?
> > > And given it processes the unsigned long bitmap in u32 chunks, I guess
> > > it doesn't work as expected on big-endian 64-bit?
> > >
> > > bitmap_parselist() looks more suitable, and the format seems to be
>
> > > compatible with what's currently used, so it won't change ABI.
>
> What ABI? We didn't have a release with it, right? So, we are quite

ABI = the parameters it accepts currently.

> flexible for few more weeks to amend it.

Indeed, we have time to make changes until the release of v5.8.

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