linux-kernel - Re: [PATCH v3 0/6] IIO pulse capture support for TI ECAP

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Date:	Sat, 15 Feb 2014 11:48:25 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Matt Porter <mporter@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robh+dt@...nel.org>,
	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Thierry Reding <thierry.reding@...il.com>
CC:	Devicetree List <devicetree@...r.kernel.org>,
	Linux PWM List <linux-pwm@...r.kernel.org>,
	Linux IIO List <linux-iio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 0/6] IIO pulse capture support for TI ECAP

On 05/02/14 20:23, Sergei Shtylyov wrote:
> Hello.
>
> On 02/05/2014 10:01 PM, Matt Porter wrote:
>
> [...]
>
>> This series adds support for PWM capture devices within IIO and
>> adds a TI ECAP IIO driver.
>
>> PWM capture devices are supported using a new IIO "pulse" channel type.
>
>> The IIO ECAP driver implements interrupt driven triggered buffer capture
>> only as raw sample reads are not applicable to this hardware.
>> Initially, the driver supports a single pulse width measurement with
>> configurable polarity. The ECAP hardware can support measurement of a
>> complete period and duty cycle but this is not yet implemented.
>

> How about pulse counting? I have the hardware that can also
> countpulses in addition to measuring the periods, so I'm interested
> in this work (initially I supported it in driver/misc/ but it got
> turned down for iio).
>
I'm afraid I'd forgotten this completely if you can dig out some links
to that discussion it would be great. Only one I can find right now
is a request that you post an ABI introducing this as a generic pulse
counter rather than a speed measurement.

Good point though - under my previous sketched outline, perhaps

in_waveform_cyclecount_input?  (I would imagine that it doesn't come
out needing scaling!)

> WBR, Sergei
>
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