Re: [PATCH] video: ARM CLCD: Added support for FBIOPAN_DISPLAY and virtual y resolution

[Russell King - ARM Linux]

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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