linux-kernel - Re: [PATCH 2/2] Input: edt-ft5x06: Add DT support

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Date:	Fri, 17 Jan 2014 02:39:52 +0100
From:	Simon Budig <simon.budig@...nelconcepts.de>
To:	Lothar Waßmann <LW@...O-electronics.de>
CC:	Mark Rutland <mark.rutland@....com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Silvio F <silvio.fricke@...il.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Jingoo Han <jg1.han@...sung.com>,
	Fugang Duan <B38611@...escale.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] Input: edt-ft5x06: Add DT support

On 16/01/14 08:49, Lothar Waßmann wrote:
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
>>> @@ -0,0 +1,31 @@
>>> +* EDT FT5x06 Multiple Touch Controller
>>> +
> [...]
>>> +- threshold: allows setting the "click"-threshold in the range from 20 to 80.
>>> +- gain: sensitivity (0..31) (lower value -> higher sensitivity)
>>> +- offset: edge compensation (0..31)
>>> +- report_rate: report rate (3..14)
>>
>> s/_/-/ on property names please. Also, it may make sense to prefix these
>> as they're rather generic sounding names.
>>
>> Could you elaborate on these a litle please? What units are each of
>> these in? Why does it make sense to have them in the dt?
>>
> I just converted them from being passed via platform_data. I have no
> idea what they actually control and what units they use. I could not
> even find a manual where they are documented.
> Maybe Simon Budig can help out here as the original driver author.

The units are not specified in the datasheets available to me. I suspect
that these are some sort of counter values related to the cap sensing.

The defaults differ for the different size glasses, so I really suspect
these are basically just numbers.

The only somewhat reasonable unit is available for the report-rate: it
is specified as about <value> * 10 touch reports per second.

Bye,
        Simon

-- 
       Simon Budig                        kernel concepts GmbH
       simon.budig@...nelconcepts.de      Sieghuetter Hauptweg 48
       +49-271-771091-17                  D-57072 Siegen



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