linux-kernel - Re: [PATCH] fix n900 dts file to work around 4.1 touchscreen regression on n900

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Date:	Sat, 30 May 2015 04:21:12 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Pavel Machek <pavel@....cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	maxime.ripard@...e-electrons.com, dmitry.torokhov@...il.com,
	pali.rohar@...il.com,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
	patrikbachan@...il.com
Subject: Re: [PATCH] fix n900 dts file to work around 4.1 touchscreen
 regression on n900

Hi,

On Fri, May 29, 2015 at 09:32:11PM +0200, Pavel Machek wrote:
> Fix dts to match what the Linux kernel expects. This works around
> touchscreen problems in 4.1 linux on Nokia n900.
>     
> Signed-off-by: Pavel Machek <pavel@....cz>
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt b/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
> index 4b641c7..09089a6 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
> @@ -32,8 +32,8 @@ Example:
>  		touchscreen-fuzz-x = <4>;
>  		touchscreen-fuzz-y = <7>;
>  		touchscreen-fuzz-pressure = <2>;
> -		touchscreen-max-x = <4096>;
> -		touchscreen-max-y = <4096>;
> +		touchscreen-size-x = <4096>;
> +		touchscreen-size-y = <4096>;
>  		touchscreen-max-pressure = <2048>;
>  
>  		ti,x-plate-ohms = <280>;
> diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> index 5c16145..5f5e0f3 100644
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -832,8 +832,8 @@
>  		touchscreen-fuzz-x = <4>;
>  		touchscreen-fuzz-y = <7>;
>  		touchscreen-fuzz-pressure = <2>;
> -		touchscreen-max-x = <4096>;
> -		touchscreen-max-y = <4096>;
> +		touchscreen-size-x = <4096>;
> +		touchscreen-size-y = <4096>;
>  		touchscreen-max-pressure = <2048>;
>  
>  		ti,x-plate-ohms = <280>;

Acked-By: Sebastian Reichel <sre@...nel.org>

max-x/fuzz-x is a leftover from development of the generic bindings
(Initially I used min and max).

If 3eea8b5d68c801fec788b411582b803463834752's behaviour should
become the new behaviour it should be documented, that maximum and
fuzz values are dependent on each other. Instead I suggest to
restore the old behaviour.

-- Sebastian

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