linux-kernel - Re: [PATCH 1/2] devicetree: power: add bindings for GPIO-driven power switches

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Message-ID: <CAL_JsqLwS51MhOJQb-Lmo=osHiYKcAcCJaxKJFdSvZBpafz7Gw@mail.gmail.com>
Date:   Thu, 15 Dec 2016 09:05:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Mark Rutland <mark.rutland@....com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Patrick Titiano <ptitiano@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        Sebastian Reichel <sre@...nel.org>,
        linux-pm <linux-pm@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH 1/2] devicetree: power: add bindings for GPIO-driven power switches

On Wed, Dec 14, 2016 at 10:58 AM, Bartosz Golaszewski
<bgolaszewski@...libre.com> wrote:
> 2016-12-13 20:27 GMT+01:00 Rob Herring <robh@...nel.org>:
>> On Sun, Dec 11, 2016 at 11:21:44PM +0100, Bartosz Golaszewski wrote:
>>> Some boards are equipped with simple, GPIO-driven power load switches.
>>> An example of such ICs is the TI tps229* series.
>>
>> How is this different than a GPIO regulator? The input and output
>> voltages just happen to be the same. I could be convinced this is
>> different enough to have a different compatible, but it somewhat seems
>> you want to use this for IIO, so you are creating a different binding
>> for that usecase.
>>
>
> It's more of a fixed regulator I suppose. Do you mean adding a new
> compatible to the fixed-regulator binding (e.g. "gpio-power-switch" or
> "simple-power-switch") and then providing an iio driver for toggling
> the switch?

Yes, at least the first part. I view the switch as just a more
specific subtype of a fixed-regulator. Whether an IIO driver is a
separate discussion which is happening.

Rob

P.S. I really don't like compatibles with "simple".