linux-kernel - Re: [PATCHv4 2/5] Input: edt-ft5x06: Add DT support

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Message-ID: <20140320130549.3bc2925e@ipc1.ka-ro>
Date:	Thu, 20 Mar 2014 13:05:49 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Simon Budig <simon.budig@...nelconcepts.de>
Cc:	Mark Rutland <mark.rutland@....com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Fugang Duan <B38611@...escale.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Jingoo Han <jg1.han@...sung.com>,
	Kumar Gala <galak@...eaurora.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Rob Landley <rob@...dley.net>,
	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-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv4 2/5] Input: edt-ft5x06: Add DT support

Hi,

Simon Budig wrote:
> On 20/03/14 12:40, Lothar Waßmann wrote:
> > The FT5x06 datasheet lists 3 variants for different panel sizes.
> > I'll add distinct compatible strings for those chips, though their SW
> > interface is (currently) identical:
> > |Required properties:
> > | - compatible:  "edt,edt-ft5206", "edt,edt-ft5x06"
> > |           or:  "edt,edt-ft5306", "edt,edt-ft5x06"
> > |           or:  "edt,edt-ft5406", "edt,edt-ft5x06"
> 
> Please note that the M09 variants of the polytouch family will use the
> same chips, but a different sw protocol (see Patch 5/5).
> 
The firmware version can be detected by SW, thus there is no need to
distinguish it via DT.

> I don't know anything about the naming scheme used in the device tree,
> but I am not sure if the chip-ID is actually useful here.
> 
Since the chip variants handle different panel sizes, it might be useful
to be able to distinguish them.


Lothar Waßmann
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