Re: [PATCH 5/6] Staging/iio/adc/touchscreen/MXS: add interrupt driven touch detection

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"Jürgen Beisert" [off-list ref] wrote:

Hi Jonathan,

On Monday 16 September 2013 17:30:32 Jonathan Cameron wrote:

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On Sunday 15 September 2013 12:56:25 Jonathan ,,, wrote:

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On 09/11/13 09:18, Juergen Beisert wrote:

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For battery driven systems it is a very bad idea to collect the
touchscreen data within a kernel busy loop.

This change uses the features of the hardware to delay and
accumulate samples in hardware to avoid a high interrupt and CPU

load.

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Note: this is only tested on an i.MX23 SoC yet.

Signed-off-by: Juergen Beisert <redacted>
CC: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
CC: devel-gWbeCf7V1WCQmaza687I9mD2FQJk+8+b@public.gmane.org
CC: Marek Vasut <redacted>
CC: Fabio Estevam <redacted>
CC: Jonathan Cameron <jic23-KWPb1pKIrIJaa/9Udqfwiw@public.gmane.org>

While this driver is placed in IIO within staging at the moment,
these changes are definitely input related.  Hence I have cc'd

Dmitry and

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the input list.

I am personaly a little uncomfortable that we have such a complex

bit

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of input code sat within an IIO driver but such is life.

Maybe an MFD for this ADC unit would be a better way to go?

That would be great and is definitely the preferred method.

Cannot continue to convert the driver into an MFD device. The project
does not 
give me the time to do so.

Regards,
Juergen

Fair enough. Perhaps someone else will pick up the gauntlet :) 
The old call of why there isn't enough time in the day!

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