Re: Unifying cape overlays into boot .dtb for BeagleBoard.org boards

[Russell King - ARM Linux <linux@arm.linux.org.uk>]

On Tue, Jun 17, 2014 at 07:59:21PM +0300, Pantelis Antoniou wrote:
> That case might already work on FPGA people's trees. I know Altera for sure
> uses overlays, and some xilinx guys popped up on past discussions.
> Their vendor trees probably use an older revision of the patches.
> 
> BTW, there is nothing special about DRM/v4l2 that can't be handled by
> a generic DT mechanism. What makes this such a big problem?

Really?

DRM is not hotpluggable in any shape or form, and David Airlie has
indicated that he does strongly opposes moving it in that direction.

DRM follows the "card" model, where, at probe time, the hardware is
known and never changes until the "card" is torn down.  No new
connectors can be added once the "card" is initialised, and no
connectors can be removed.  Any changes must be done by tearing down
the entire card and reconstructing it (if reconstructing it with a
reduced set of hardware is appropriate.)

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