Re: [RFC/PATCH 0/1] Quadrature Encoder Support

[Felipe Balbi <felipe.balbi@linux.intel.com>]

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Hi,

William Breathitt Gray <vilhelm.gray@gmail.com> writes:
> On Sun, Sep 15, 2019 at 02:53:47PM +0100, Jonathan Cameron wrote:
>> On Mon,  9 Sep 2019 15:16:04 +0300
>> Felipe Balbi <felipe.balbi@linux.intel.com> wrote:
>> 
>> > Hi,
>> > 
>> > Here's a simple RFC for Intel's Quadrature Encoder. Let me make it clear
>> > that I don't mean we should the following patch as is, rather I'd like
>> > to open the discussion to, perhaps, extending Industrial Automation
>> > Framework with support for Quadrature Encoders.
>> > 
>> > Let me know if you think IIO would be correct place for such devices,
>> > then I can start reworking the driver to provide an IIO-compliant
>> > interface.
>> > 
>> > I'm thinking we would need standard sysfs files for configuring the QEP
>> > into single-shot QEP mode or buffered Capture mode, configure thresholds
>> > and other details.
>> 
>> Hi Felipe,
>> 
>> Fairly recently, similar concerns that IIO didn't really suite these
>> devices lead William to create a specific 'counters' subsystem.
>> +CC William.
>> 
>> It may not address all of your requirements yet, but I would imagine it
>> is a better fit than IIO would ever be.  We have moved all the older
>> counter drivers out of IIO and across to this new subsystem.
>> 
>> Thanks,
>> 
>> Jonathan
>
> Felipe,
>
> Take a look at the Generic Counter interface, it may be what you need:
> https://www.kernel.org/doc/html/latest/driver-api/generic-counter.html

Thanks guys, I wasn't aware of this new subsystem. I'll have a look at
start porting the driver over.

> There are some existing quadrature encoder counter devices using this
> interface already; look at the files under drivers/counter for
> reference.
>
> This interface is still relatively new, so if you have any problems just
> shoot me an email and I'll be happy to help. :-)

Will do William.

cheers

-- 
balbi

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