From mboxrd@z Thu Jan  1 00:00:00 1970
From: LW@KARO-electronics.de (Lothar =?UTF-8?B?V2HDn21hbm4=?=)
Date: Thu, 21 Nov 2013 09:00:52 +0100
Subject: [PATCHv9][ 3/3] ARM: dts: cpuimx35 Add touchscreen support.
In-Reply-To: <20131121050922.GF18477@ns203013.ovh.net>
References: <1383916659-9988-1-git-send-email-denis@eukrea.com>
 <1383916659-9988-3-git-send-email-denis@eukrea.com>
 <20131121050922.GF18477@ns203013.ovh.net>
Message-ID: <20131121090052.1684db75@ipc1.ka-ro>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi,

Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 14:17 Fri 08 Nov     , Denis Carikli wrote:
> > Cc: Rob Herring <rob.herring@calxeda.com>
> > Cc: Pawel Moll <pawel.moll@arm.com>
> > Cc: Mark Rutland <mark.rutland@arm.com>
> > Cc: Stephen Warren <swarren@wwwdotorg.org>
> > Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
> > Cc: Grant Likely <grant.likely@linaro.org>
> > Cc: devicetree at vger.kernel.org
> > Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> > Cc: linux-input at vger.kernel.org
> > Cc: Sascha Hauer <kernel@pengutronix.de>
> > Cc: linux-arm-kernel at lists.infradead.org
> > Cc: Lothar Wa?mann <LW@KARO-electronics.de>
> > Cc: Shawn Guo <shawn.guo@linaro.org>
> > Cc: Eric B?nard <eric@eukrea.com>
> > Signed-off-by: Denis Carikli <denis@eukrea.com>
> > ---
> > ChangeLog v8->v9:
> > - Added Grant Likely in the cc list.
> > - Adapted to the removal of the pinctrl properties in the tsc2007 documentation.
> > - Fixed the gpios property (before, it was set to active high by error).
> > 
> > ChangeLog v7->v8:
> > - Added Shawn Guo in the cc list.
> > ---
> >  arch/arm/boot/dts/imx35-eukrea-cpuimx35.dtsi |   21 +++++++++++++++++++++
> >  1 file changed, 21 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/imx35-eukrea-cpuimx35.dtsi b/arch/arm/boot/dts/imx35-eukrea-cpuimx35.dtsi
> > index b9cb5a5..f25a40f 100644
> > --- a/arch/arm/boot/dts/imx35-eukrea-cpuimx35.dtsi
> > +++ b/arch/arm/boot/dts/imx35-eukrea-cpuimx35.dtsi
> > @@ -36,6 +36,27 @@
> >  		compatible = "nxp,pcf8563";
> >  		reg = <0x51>;
> >  	};
> > +
> > +	tsc2007: tsc2007 at 48 {
> > +		compatible = "ti,tsc2007";
> > +		reg = <0x48>;
> > +		interrupt-parent = <&gpio3>;
> > +		interrupts = <0x2 0x8>;
> > +		gpios = <&gpio3 2 1>;
> as explain on the binding drop this gpios this is an IRQ not a gpio
> 
> NACK
The driver needs an interrupt to get notified about pendown events and
needs to poll the pendown signal to find out when the pen has been
lifted. Both the interrupt and the pendown signal happen to be
signalled on the same pin. Thus, IMO it is perfectly well to have the
interrupt property as well as the gpios property here.

How would you tell the driver which pin to poll for detecting the pen
up event?

Having a platform callback with hardcoded GPIO numbers is not an option.


Lothar Wa?mann
-- 
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