Hi Geert,

On Tue, Nov 30, 2021 at 09:13:45AM +0100, Geert Uytterhoeven wrote:

On Mon, Nov 29, 2021 at 11:17 PM Maxime Ripard [off-list ref] wrote:

quoted

The problem that fbtft (and this series) wants to fix is completely
different though: it wants to address the issue the users are facing.
Namely, you get a cheap display from wherever, connect it to your shiny
new SBC and wants to get something on the display.

In this situation, the user probably doesn't have the knowledge to
introduce the compatible in the kernel in the first place. But there's
also some technical barriers there: if they use secure boot, they can't
change the kernel (well, at least the knowledge required is far above
what we can expect from the average user). If the platform doesn't allow

If you can change the DT, you can introduce a vulnerability to change
the kernel ;-)

Indeed

quoted

access to the DT, you can't change the DT either.

How do people connect a cheap display from wherever to their shiny
new SBC and make it work, without modifying DT?

Through overlays, usually. I guess it would still qualify as "DT", but
it's not the main DT

And the other issues remain the same: while the DT could be "easily"
patched, the kernel certainly isn't and we need both with the current
expectations.

Maxime