[PATCH 2/3] dts: Add ability to build DTOs only from arch/$(ARCH)/dts

[Marek Vasut]

On 9/30/24 8:10 AM, Jan Kiszka wrote:
> On 30.09.24 08:02, Sumit Garg wrote:
>> + Jan
>>
>> Hi Marek,
>>
>> On Sat, 28 Sept 2024 at 03:20, Marek Vasut <marex at denx.de> wrote:
>>>
>>> Currently the enablement of OF_UPSTREAM results on the build system
>>> searching for DTs only in dts/upstream/ . There are platforms which
>>> use U-Boot specific DTBOs applied on top of U-Boot control DT during
>>> SPL stage, and source DTs for these are located in arch/$(ARCH)/dtb.
>>
>> I would like to understand the need to maintain DTBOs separately from
>> DTBs. Why aren't we pushing DTBOs to Linux kernel sources as we do for
>> DTBs? Jan recently pushed those so-called U-Boot specific DTBOs for a
>> TI platform which were accepted in the Linux kernel upstream. This
>> patch will just deny the ability to build those DTBOs from dts
>> upstream tree. IMHO, this takes a step backwards on the whole notion
>> of OF_UPSTREAM.
> 
> Exactly - I was sent the other direction (get DTSOs upstream), and I'm
> now only waiting for 6.12-rc1-dts so that the first round to make use of
> that can be integrated into U-Boot [1]. Anything that would prevent that
> here is not welcome anymore.

I will only re-iterate what I wrote on my previous email, this commit 
does not prevent building DTBOs from dts/upstream/ , they are preferred. 
This only adds fallback to U-Boot local DTOs if the upstream DTOs are 
not upstream yet.

>> If we really want a middle ground solution to allow migration to
>> OF_UPSTREAM easier then we need to find a way to build DTBOs from both
>> directories (local and upstream dts). I would imagine that will likely
>> complicate building and packaging DTBOs.
> 
> I tried that, and I got the clear signal that it is not desired.

Is there a link to a discussion ?