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

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Message-ID: <20150529194955.GV2026@saruman.tx.rr.com>
Date:	Fri, 29 May 2015 14:49:55 -0500
From:	Felipe Balbi <balbi@...com>
To:	Pavel Machek <pavel@....cz>
CC:	Sebastian Reichel <sre@...nel.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	<maxime.ripard@...e-electrons.com>, <dmitry.torokhov@...il.com>,
	<pali.rohar@...il.com>, <sre@...ian.org>, <sre@...g0.de>,
	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>;

IMHO, the older binding needs to be supported as well. It's fine to
update the DTS for the new binding, but even Documentation says
touchscreen-max-[xy] and if the driver changed that, the driver should
be fixed too. Besides, it seems like this has been in tree since v3.16:

$ git describe a38cfebb56898633687ab337fd53710e63a0aedd
v3.15-rc5-72-ga38cfebb5689

So, because this has been wrongly documented for so long, we should
support both bindings. Sure, deprecate touchscreen-max-[xy], but they
must still be supported, IMO.

In any case, for this patch:

Reviewed-by: Felipe Balbi <balbi@...com>

-- 
balbi

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