On Mon, 22 Jan 2024 at 05:31, Tom Rini trini@konsulko.com wrote:
On Sun, Jan 21, 2024 at 10:41:51PM +0000, Caleb Connolly wrote:
On 21/01/2024 15:33, Marek Vasut wrote:
[snip]
Assume that there is some large breaking change in Linux 6.(n+1), something which would be problematic for specific U-Boot platform (e.g. i.MX) or would require a lot of work to sort out, will there be a way to temporarily pin DTs for specific platform to older DT version until that is resolved (e.g. pin to 6.n) ?
(Upstream) devicetree has to be forwards and backwards compatible, were such a breaking change to get merged without prior discussion with DT users (i.e. U-Boot) then I think the correct course of action would be to revert it.
The caveat is "unless it was wrong before", which happens more often than is generally thought of I think. I'm not sure off-hand the best way to deal with that.
I think that's the reason we just want to pull DT at once in the beginning of the next window and allow U-Boot developers/maintainers to detect and fix problems during the full U-Boot release cycle. However, we are open to discussions for a revert if there is a major DT ABI break among Linux major (.0) releases affecting many U-Boot platforms.
-Sumit
-- Tom