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

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Date:   Wed, 20 May 2020 15:40:52 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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

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
flexible for few more weeks to amend it.

> > Is that the one you propose?
>
> Yes, sorry for the confusion.
>
> > > (Despite other small clean ups, like strstrip() use)
> >
> > Aka strim()? There are too many of them, to know all of them by heart ;-)
>
> The difference between them is __must_check flag. But yes.



-- 
With Best Regards,
Andy Shevchenko