linux-kernel - Re: [PATCH 2/2] iio: imu: mpu6050: Add support for vdd-supply regulator

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Date:   Thu, 7 Nov 2019 19:12:00 +0100
From:   Stephan Gerhold <stephan@...hold.net>
To:     Jean-Baptiste Maneyrol <JManeyrol@...ensense.com>
Cc:     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>,
        Linus Walleij <linus.walleij@...aro.org>,
        Brian Masney <masneyb@...tation.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        "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>
Subject: Re: [PATCH 2/2] iio: imu: mpu6050: Add support for vdd-supply
 regulator

On Thu, Nov 07, 2019 at 01:29:33PM +0000, Jean-Baptiste Maneyrol wrote:
> Hi Stephan,
> 
> I think the regulator_bulk usage is good, and the core_enable/disable_regulator functions implemented the way you did is perfect for the init/shutdown phase.
> 
> We just need to change the suspend/resume implementation to use something different.

As far as I can tell, the regulator bulk API is designed to be used when
you want to enable/disable multiple regulators at the same time.
It does not really allow controlling one of its regulators separately
(in a clean way).

E.g. if you would use regulator_bulk_disable() but already disabled one
of the regulators at some point earlier, you would run into a warning
because the regulator is disabled twice.

My updated patch is still clean enough (in my opinion), so I would say
it is better to avoid the regulator bulk API for this situation.
I will send v2 shortly.

Thanks,
Stephan