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

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 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.

Thanks,
JB


From: linux-iio-owner@xxxxxxxxxxxxxxx <linux-iio-owner@xxxxxxxxxxxxxxx> on behalf of Stephan Gerhold <stephan@xxxxxxxxxxx>

Sent: Wednesday, November 6, 2019 22:36

To: Jean-Baptiste Maneyrol <JManeyrol@xxxxxxxxxxxxxx>

Cc: Jonathan Cameron <jic23@xxxxxxxxxx>; Hartmut Knaack <knaack.h@xxxxxx>; Lars-Peter Clausen <lars@xxxxxxxxxx>; Peter Meerwald-Stadler <pmeerw@xxxxxxxxxx>; Rob Herring <robh+dt@xxxxxxxxxx>; Mark Rutland <mark.rutland@xxxxxxx>; Linus Walleij <linus.walleij@xxxxxxxxxx>;
 Brian Masney <masneyb@xxxxxxxxxxxxx>; Jonathan Marek <jonathan@xxxxxxxx>; linux-iio@xxxxxxxxxxxxxxx <linux-iio@xxxxxxxxxxxxxxx>; devicetree@xxxxxxxxxxxxxxx <devicetree@xxxxxxxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx <linux-kernel@xxxxxxxxxxxxxxx>

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

 


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Hi JB,



On Wed, Nov 06, 2019 at 07:55:20PM +0000, Jean-Baptiste Maneyrol wrote:

> Hello Stephan,

> 

> nice patch but I have an important concern.

> 

> We are calling the core_enable/disable_regulator functions when going into suspend and resume.

> With your changes, we are going to power down the chip when going into suspend and then power it up again.

> This way we will loose all already set configuration, like FSR, sampling rate, init values, ...

> The chip will not be able to work correctly anymore after a suspend-resume cycle.

> 

> You need to change the resume/suspend handlers to only disable/enable the vddio regulator, not the vdd one.



That is a good point, thanks!

I guess we are not able to use the regulator bulk API in this case...



I will send a v2 soon.



Stephan





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