linux-kernel - Re: [PATCH v2] iio: imu/mpu6050: support dual-edge IRQ

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Date:   Sat, 11 Jan 2020 16:07:35 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: imu/mpu6050: support dual-edge IRQ

On Sat, Jan 11, 2020 at 12:10:47PM +0000, Jonathan Cameron wrote:
> On Mon, 06 Jan 2020 12:17:54 +0100
> Michał Mirosław <mirq-linux@...e.qmqm.pl> wrote:
> 
> > Make mpu6050 usable on platforms which provide only any-edge interrupts.
> > This also covers shared interrupt case.
> 
> So this had me confused for a bit because I assumed we were trying to make
> a level interrupt providing device work with edge interrupts.  Seems
> device supports a pulsed  mode and the driver supports this.
> 
> Why do we want to detect on both edges?  Do you have a crazy board
> with this shared and some devices using the rising edge and some the falling one?
> 
> For shared case it should return that it did not handle the interrupt
> to allow spurious interrupt detection to work...

Hmm. The shared interrupt is a red herring. I'll remove the sentence
from commitmsg as it looks like the driver needs a few more fixups
to be able to share the interrupt line.

The patch is required on platforms that support only dual-edge
interrupts, like eg. AT91SAM9G45-based one I have.

Best Regards,
Michał Mirosław