linux-kernel - Re: [PATCH 0/2] Add Updown Counter support for Milbeaut M10V SoC

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Date:   Sun, 31 Mar 2019 11:09:32 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     Shinji Kanematsu <kanematsu.shinji@...ionext.com>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     robh+dt@...nel.org, mark.rutland@....com, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        masami.hiramatsu@...aro.org, jaswinder.singh@...aro.org,
        orito.takao@...ionext.com, sugaya.taichi@...ionext.com,
        kasai.kazuhiro@...ionext.com
Subject: Re: [PATCH 0/2] Add Updown Counter support for Milbeaut M10V SoC

On Sat, Mar 30, 2019 at 06:36:03PM +0000, Jonathan Cameron wrote:
> On Tue, 26 Mar 2019 15:32:34 +0900
> Shinji Kanematsu <kanematsu.shinji@...ionext.com> wrote:
> 
> > This is a series of patch which adds Updown Counter support on
> > Milbeaut M10V SoC.
> > 
> > The Updown Counter counts input pulse signal from external quadrature encoder.
> > It also has input pulse signal counter function.
> Hi Shinji,
> 
> Are you aware of the counter subsystem that has been proposed (and
> as far as I am concerned is ready to be merged)?
> 
> https://patchwork.kernel.org/project/linux-iio/list/?series=147
> (I think that's the latest version posted)..
> William, perhaps you could give an update?
> 
> (bad luck, you are getting popular ;)
> 
> I'll take a quick review as it stands, as some issues may carry over.
> I appreciate that it's always unfortunate to try to upstream stuff at the
> same time as a new framework is being developed / upstreamed, but I don't
> intend to take any additional counter drivers into IIO.  We just
> end up having to maintain old interfaces in more and more drivers.
> 
> Thanks,
> 
> Jonathan

Shinji,

If you reimplement this driver to use the new Generic Counter API, I can
pick it up and include it with my next patchset submission. Please base
your patches ontop of the "generic_counter_v10" branch from my personal
repository:

https://gitlab.com/vilhelmgray/iio/commits/generic_counter_v10

Documentation can be found at:

	Documentation/driver-api/generic-counter.rst
	Documentation/ABI/testing/sysfs-bus-counter

Look at the existing drivers inside the drivers/counter directory to
serve as references:

	drivers/counter/ftm-quaddec.c
	drivers/counter/stm32-timer-cnt.c

If you have any troubles or difficulties with the API, send me a message
and I will be happy to help. :-)

Thank you,

William Breathitt Gray

> 
> > 
> > Shinji Kanematsu (2):
> >   dt-bindings: iio: counter: Add Milbeaut Updown Counter
> >   iio: counter: Add support for Milbeaut Updown Counter
> > 
> >  .../bindings/iio/counter/milbeaut-updown_cnt.txt   |  22 ++
> >  drivers/iio/counter/Kconfig                        |  12 +
> >  drivers/iio/counter/Makefile                       |   1 +
> >  drivers/iio/counter/milbeaut-updown.h              |  38 ++
> >  drivers/iio/counter/milbeaut-updown_cnt.c          | 385 +++++++++++++++++++++
> >  5 files changed, 458 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/counter/milbeaut-updown_cnt.txt
> >  create mode 100644 drivers/iio/counter/milbeaut-updown.h
> >  create mode 100644 drivers/iio/counter/milbeaut-updown_cnt.c
> > 
>