[Linux-stm32] [PATCH] [RFC] ARM: dts: stm32: Add DTs for STM32MP15x variants of the DH SOM and PDK2

[Marek Vasut]

On 3/24/20 3:07 PM, Alexandre Torgue wrote:
> 
> 
> On 3/24/20 2:22 PM, Marek Vasut wrote:
>> On 3/24/20 2:04 PM, Alexandre Torgue wrote:
>>>
>>>
>>> On 3/23/20 3:31 AM, Marek Vasut wrote:
>>>> The DH PDK2 can be populated with SoM with any STM32MP15x variant.
>>>> Add the DTs describing the remaining combinations.
>>>>
>>>> Signed-off-by: Marek Vasut <marex at denx.de>
>>>> Cc: Alexandre Torgue <alexandre.torgue at st.com>
>>>> Cc: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
>>>> Cc: Patrice Chotard <patrice.chotard at st.com>
>>>> Cc: Patrick Delaunay <patrick.delaunay at st.com>
>>>> Cc: linux-stm32 at st-md-mailman.stormreply.com
>>>> To: linux-arm-kernel at lists.infradead.org
>>>> ---
>>>> NOTE: Is there a better way to do this than to have this kind of a
>>>>      combinatorial explosion of DTs ?
>>>
>>> I have no better idea. Question was the same for stm32 boards, and I
>>> chose to take this option.
>>
>> One option would be to just have DT for the most feature-complete option
>> (157) and then have U-Boot remove the nodes for HW which is not present
>> on the particular SoC option if it's one of the more limited ones (153,
>> 151).
>>
> 
> Yes it was a possibility that I discussed with kevin H. at the latest
> ELCE but at the end the best way to follow was to enhance number of dts
> files. The best would be to have dedicated folders but it is another story.

Or use DT overlays somehow ? U-Boot can apply DTOs onto DT before
booting Linux.

Having tons of DTs on a system is a lot of duplication, I don't really
like that.

But for starters, feel free to review this patch.