linux-kernel - Re: [PATCH v2 5/8] drivers:input:ads7846(+tsc2046): add new common binding names, pre-calibration and flipping

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Message-ID: <20151113222952.GB24590@earth>
Date:	Fri, 13 Nov 2015 23:29:52 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	"H. Nikolaus Schaller" <hns@...delico.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Haibo Chen <haibo.chen@...escale.com>,
	Andrey Gelman <andrey.gelman@...pulab.co.il>,
	Igor Grinberg <grinberg@...pulab.co.il>,
	Aaron Sierra <asierra@...-inc.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, gta04-owner@...delico.com,
	linux-input@...r.kernel.org
Subject: Re: [PATCH v2 5/8] drivers:input:ads7846(+tsc2046): add new common
 binding names, pre-calibration and flipping

Hi,

On Fri, Nov 13, 2015 at 09:35:56PM +0100, H. Nikolaus Schaller wrote:
> commit b98abe52fa8e ("Input: add common DT binding for touchscreens")
> introduced common DT bindings for touchscreens [1] and a helper function to
> parse the DT.
> 
> This has been integrated and interpretation of the inversion (flipping)
> properties for the x and y axis has been added to accommodate any
> orientation of the touch in relation to the LCD.
> 
> By scaling the min/max ADC values to the screen size it is now possible to
> pre-calibrate the touch so that is (almost) exactly matches the LCD it is
> glued onto. This allows to well enough operate the touch before a user
> space calibration can improve the precision.
> 
> [1]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>  .../devicetree/bindings/input/ads7846.txt          |  8 ++-
>  drivers/input/touchscreen/ads7846.c                | 72 ++++++++++++++++++++--
>  2 files changed, 74 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/input/ads7846.txt b/Documentation/devicetree/bindings/input/ads7846.txt
> index df8b127..ae56355 100644
> --- a/Documentation/devicetree/bindings/input/ads7846.txt
> +++ b/Documentation/devicetree/bindings/input/ads7846.txt
> @@ -26,12 +26,17 @@ Additional required properties:
>  
>  Optional properties:
>  
> +You can optionally specify any of the touchscreen parameters described in
> +
> +	Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
> +
> +This allows to scale, invert or swap coordinates and define the fuzz factors.
> +
>  	ti,vref-delay-usecs		vref supply delay in usecs, 0 for
>  					external vref (u16).
>  	ti,vref-mv			The VREF voltage, in millivolts (u16).
>  	ti,keep-vref-on			set to keep vref on for differential
>  					measurements as well
> -	ti,swap-xy			swap x and y axis

I guess this should be:

ti,swap-xy: deprecated name for touchscreen-swapped-x-y

-- Sebastian

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