linux-kernel - Re: [PATCH 2/2] iio: misc: add support for GPIO power switches

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Message-ID: <20161229162919.j2ej2cyeuoqnxykf@earth>
Date:   Thu, 29 Dec 2016 17:29:20 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Patrick Titiano <ptitiano@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Alexandre Courbot <gnurou@...il.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH 2/2] iio: misc: add support for GPIO power switches

Hi Linux,

On Wed, Dec 28, 2016 at 01:50:17PM +0100, Linus Walleij wrote:
> On Sun, Dec 11, 2016 at 11:21 PM, Bartosz Golaszewski
> <bgolaszewski@...libre.com> wrote:
> 
> > Some power-measuring ADCs work together with power load switches which
> > allow to power-cycle measured devices.
> >
> > An example use case would be measuring the power consumption of a
> > development board during boot using a power monitor such as TI INA226
> > and power-cycling the board remotely using a TPS229* power switch.
> >
> > Add an iio driver for simple GPIO power switches and expose a sysfs
> > attribute allowing to toggle their state.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> I don't get this, isn't this doing the same as
> drivers/power/reset/gpio-poweroff.c
> ?
> 
> With the only difference that the latter uses the standard syscall
> from pm_power_off to reboot the system instead of some random
> sysfs file.

As far as I understand it, the TPS229 is used by Barzosz to poweroff
a remote system. The gpio-poweroff driver is used to poweroff the
local system.

-- Sebastian

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