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

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Message-ID: <5bbedbb7-2391-c927-deab-75fd9fffe7f6@kernel.org>
Date:   Fri, 30 Dec 2016 15:03:06 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Lars-Peter Clausen <lars@...afoo.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Rob Herring <robh@...nel.org>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Hartmut Knaack <knaack.h@....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 23/12/16 11:40, Lars-Peter Clausen wrote:
> On 12/23/2016 10:07 AM, Geert Uytterhoeven wrote:
>> BTW, I'm not an IIO expert, but from my limited knowledge, it looks like "O"
>> support in IIO is limited to DACs?
> 
> Depends on what you categorize as DACs. There are also
> potentiometer/rheostat drivers. They are kind of like DACs but the unit you
> control are ohm, rather than current or voltage.
Though they are still in staging there are also things like function generators.

I've been mulling doing a driver for the st-powerstep01 parts as well which
is a smart stepper motor controller.  At that level we'd need to start describing
the connected stepper motors in DT :) Whole chunk of API to define to do that
though - might well take longer than writing the driver.

So in practice yeah - dac like things, but then on the input side they are almost
all really ADCs with some funny analog stuff on the front end ;)

Arguably switches are 1 bit DACs ;)

The distinction here is whether 'what is passing through' the device is knowable.
So regulators and your power switch are well described.  A relay less so unless
we know what load it is switching...

+ it's IIO.  We are open to almost anything as long as we aren't stepping on
any toes!

Jonathan

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