[Ksummit-discuss] Devicetree Workshop at Kernel Summit Prague (26 Oct 2017)

Grant Likely grant.likely at secretlab.ca
Tue Oct 17 13:30:00 UTC 2017

On Sat, Oct 14, 2017 at 1:34 PM, Thomas Petazzoni
<thomas.petazzoni at free-electrons.com> wrote:
> Hello,
> On Mon, 9 Oct 2017 21:39:51 +0100, Grant Likely wrote:
>> Here is my current list of topics in no particular order, including
>> the topic moderator:
>> Runtime memory consumption (Rob Herring)
>> Overlay maintenance plan (TBC)
>> Stable ABI for devicetree (TBC)
>> DT YAML encoding (Pantelis Antoniou)
>> DT Schema format - option 1 (Pantelis Antoniou)
>> DT Schema format - option 2 (Grant Likely)
>> Sharing Generic bindings (TBC)
>> devicetree.org update (Grant)
>> Reply to this email if you want to propose another topic.
> I'd like to propose a quick discussion on how to avoid duplicating DT
> description when a SoC is composed of aggregations of IP blocks that
> are duplicated (in 2, 4 or 8 copies).
> As an example, we currently have
> arch/arm64/boot/dts/marvell/armada-cp110-master.dtsi and
> arch/arm64/boot/dts/marvell/armada-cp110-slave.dtsi that are almost
> identical, because they represent the same aggregation of IP blocks,
> present two times in the same SoC (Marvell Armada 8K). As we are going
> to have SoCs with more than 2 copies in the future, we want to find a
> way to avoid duplicating the description of those aggregations.
> I'd like to present the problem scope, a possible solution solely based
> on C preprocessor macros, and then open the discussion to see what is
> the right approach to solve this problem.

I'll include time for this alongside the overlay maintenance plan
topic. It seems to me that they are closely related problems.


> I don't think that more than 10-15 minutes is needed for presenting the
> problem scope and one possible solution. The following discussion may
> be longer though.
> I'll be attending on both the morning and afternoon, but I'll be
> leaving at ~4:30 PM.
> Best regards,
> Thomas Petazzoni
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com

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