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

[Jürgen Beisert]

Hi Marek,

On Monday 16 September 2013 16:23:48 Marek Vasut wrote:
> > On Sunday 15 September 2013 12:56:25 Jonathan Cameron wrote:
> > > On 09/11/13 09:18, Juergen Beisert wrote:
> > > > 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.
> > > >
> > > > Note: this is only tested on an i.MX23 SoC yet.
> > > >
> > > > Signed-off-by: Juergen Beisert <jbe at pengutronix.de>
> > > > CC: linux-arm-kernel at lists.infradead.org
> > > > CC: devel at driverdev.osuosl.org
> > > > CC: Marek Vasut <marex at denx.de>
> > > > CC: Fabio Estevam <fabio.estevam at freescale.com>
> > > > CC: Jonathan Cameron <jic23 at cam.ac.uk>
> > >
> > > 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 the
> > > input list.
> > >
> > > I am personaly a little uncomfortable that we have such a complex bit
> > > 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? Currently I
> > have a different problem with this driver, because the ADC unit monitors
> > the battery as well. And the charging driver from the power subsystem
> > needs these values to charge the battery in a correct manner.
>
> Are you planning to post the power block patches too ?

When they will work: yes. Currently it crashes all the time. The PMIC is a 
beast...

Regards,
Juergen

-- 
Pengutronix e.K.                              | Juergen Beisert             |
Linux Solutions for Science and Industry      | http://www.pengutronix.de/  |