On Thu, 5 Apr 2018, Manuel Bouyer wrote:

On Wed, Apr 04, 2018 at 06:56:19PM -0300, Jared McNeill wrote:
There is a more specific compatible string on /chosen/framebuffer that you
can match on ("allwinner,simple-framebuffer"). If your driver claims that
node, you won't have to worry about handoff at all...

Yes I've seen it too. Indeed I could use it to prevent simplefb from attaching.
But see below


You'll want to add FDT_CONSOLE support to your DE driver as well.

For this I have a problem: allwinner,simple-framebuffer isn't specific
enough. At the time FDT_CONSOLE is called we don't know which variant of
debe we have, so we don't if we'll can handle it.
So I choose a way which allows fallback to simplefb when needed
(and actually it's needed on all but a10 and a20).

You could walk the OF tree looking for a compatible device. We could add a helper to ofw_subr.c for this.


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