linux-kernel - Re: [PATCH] video: ARM CLCD: Added support for FBIOPAN

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Message-ID: <20150302161122.GP8656@n2100.arm.linux.org.uk>
Date:	Mon, 2 Mar 2015 16:11:22 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazau <anatol@...gle.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	"bcm-kernel-feedback-list@...adcom.com" 
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH] video: ARM CLCD: Added support for FBIOPAN_DISPLAY and
 virtual y resolution

On Mon, Mar 02, 2015 at 04:08:29PM +0000, Pawel Moll wrote:
> I'm not sure about this... The word "virtual" never works well with
> device tree nodes defined as "hardware description".
> 
> I understand what you're doing, but adding this property to the display
> controller's node doesn't sound right. How does this describe hardware?
> If anywhere, it's more like a job for the panel node?

A better description (and implementation) would be to describe the size
of the RAM available for video purposes.  The driver can then use the
requested virtual X resolution to limit (and/or compute) the virtual Y
resolution to allow Y panning/wrapping of the display.

This would match some hardware where the video RAM is indeed a separate
physical set of RAM (such as the IM-PD/1).

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