Re: [PATCHv7][ 1/4] Input: tsc2007: Add device tree support.

From: "Lothar Waßmann" <LW@KARO-electronics.de>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree@vger.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Eric BXXnard <eric@eukrea.com>, Pawel Moll <pawel.moll@arm.com>,
	Stephen Warren <swarren@wwwdotorg.org>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Rob Herring <rob.herring@calxeda.com>,
	Denis Carikli <denis@eukrea.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Sascha Hauer <kernel@pengutronix.de>,
	linux-input@vger.kernel.org, Shawn Guo <shawn.guo@linaro.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCHv7][ 1/4] Input: tsc2007: Add device tree support.
Date: Fri, 25 Oct 2013 07:56:39 +0200	[thread overview]
Message-ID: <20131025075639.75f45fb0@ipc1.ka-ro> (raw)
In-Reply-To: <20131024164746.3CB36C403B6@trevor.secretlab.ca>

Hi,

Grant Likely wrote:
> On Thu, 24 Oct 2013 14:42:13 +0200, Denis Carikli <denis@eukrea.com> 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: devicetree@vger.kernel.org
> > Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> > Cc: linux-input@vger.kernel.org
> > Cc: Sascha Hauer <kernel@pengutronix.de>
> > Cc: linux-arm-kernel@lists.infradead.org
> > Cc: Lothar WaÃŸmann <LW@KARO-electronics.de>
> > Cc: Eric BÃ©nard <eric@eukrea.com>
> > Signed-off-by: Denis Carikli <denis@eukrea.com>
> > ---
> > ChangeLog v6->v7:
> > - One small whitespace cleanup.
> > - The properties specific to that driver are now prefixed with "ti,".
> > - The ti,fuzzy property has now better documentation.
> > ---
> >  .../bindings/input/touchscreen/tsc2007.txt         |   45 +++++
> >  drivers/input/touchscreen/tsc2007.c                |  194 +++++++++++++++-----
> >  2 files changed, 198 insertions(+), 41 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt b/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
> > new file mode 100644
> > index 0000000..516b63b
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt
> > @@ -0,0 +1,45 @@
> > +* Texas Instruments tsc2007 touchscreen controller
> > +
> > +Required properties:
> > +- compatible: must be "ti,tsc2007".
> > +- reg: I2C address of the chip.
> > +- ti,x-plate-ohms: X-plate resistance in ohms.
> > +
> > +Optional properties:
> > +- gpios: the interrupt gpio the chip is connected to (trough the penirq pin)
> > +  (see GPIO binding[2] for more details).
> 
> Hmmm, why is this needed? Is the line used for anything other than
> finding the irq number? If it is just an interrupt then an interrupts
> property is all that should be specified.
> 
It's also the pendown detect GPIO. It asserts an interrupt when first
activated and is then polled in the driver until it goes inactive again.


Lothar Waßmann
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