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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Tue, 18 Feb 2020 20:09:12 +0100
Message-ID: <CAMuHMdU9=vgO6ohoYTQMGjoFzhRy=4hYGjVyRsTK2uoNsU08XQ@mail.gmail.com>
Subject: Re: [PATCH v5 4/5] docs: gpio: Add GPIO Aggregator documentation
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Jonathan Corbet <corbet@lwn.net>,
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        Peter Maydell <peter.maydell@linaro.org>,
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        Magnus Damm <magnus.damm@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
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        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
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Hi Randy,

On Tue, Feb 18, 2020 at 7:30 PM Randy Dunlap <rdunlap@infradead.org> wrote:
> On 2/18/20 7:18 AM, Geert Uytterhoeven wrote:
> > Document the GPIO Aggregator, and the two typical use-cases.
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

> > --- /dev/null
> > +++ b/Documentation/admin-guide/gpio/gpio-aggregator.rst
> > @@ -0,0 +1,102 @@
> > +.. SPDX-License-Identifier: GPL-2.0-only
> > +
> > +GPIO Aggregator
> > +===============
> > +
> > +The GPIO Aggregator allows to aggregate GPIOs, and expose them as a new
>
> "allows" really wants an object following the verb [although the kernel sources
> and docs have many cases of it not having an object].  Something like
>
>                        allows {you, one, someone, users, a user} to aggregate

Thanks for the hint!

> > +             Example: Instantiate a new GPIO aggregator by aggregating GPIO
> > +             19 of "e6052000.gpio" and GPIOs 20-21 of "gpiochip2" into a new
> > +             gpio_chip:
> > +
> > +             .. code-block:: bash
> > +
> > +                 echo 'e6052000.gpio 19 gpiochip2 20-21' > new_device
> > +
>
> Does the above command tell the user that the new device is named
> "gpio-aggregator.0", as used below?

Yes, it will be printed through the kernel log, cfr. the sample session in
the cover letter.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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