Re: [PATCH 1/3] Input: zforce - use irq handler instead of gpio polling

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Tue, Jul 14, 2015 at 09:42:00AM +0200, Dirk Behme wrote:
> Hi Dmitry,
> 
> On 13.07.2015 19:04, Dmitry Torokhov wrote:
> >On Mon, Jul 13, 2015 at 02:49:37PM +0200, Dirk Behme wrote:
> >>From: Oleksij Rempel <external.Oleksij.Rempel@de.bosch.com>
> >>
> >>Remove the IRQ GPIO polling and request. Existing DTS should not be affected
> >>since the IRQ registration was and is based on "interrupts" descriptor of DTS.
> >
> >But this means that consecutive touchscreen readings will be delayed by
> >the time it takes to schedule the thread.
> >
> >What is the motivation for this change?
> 
> 
> This is the generic part we've done for a special hardware
> configuration: There is some hardware which uses an I2C Serializer /
> Deserializer (SerDes) to communicate with the zFroce touch driver.
> In this case the SerDes will be configured as an interrupt
> controller and the zForce driver will have no access to poll the
> GPIO line.

In this case can we make gpio optional and use it if it is specified
falling back on one read per ISR invocation in its absence?

Thanks.

-- 
Dmitry