Question about writing binding files for numa

Question about writing binding files for numa

[Chen Wang]

Hi, I am working on writing dts for a new SOC - SG2042, you can see
the changes on https://github.com/unicornx/linux-riscv/commit/ee862fc4ebeade32bff00ad014d6b0513c0942a7.
This hardware uses a NUMA architecture,  so a "distance-map" node is
added and several "numa-node-id" are added for cpu/memory. The problem
is I find there is no YAML binding for numa, I only find
"Documentation/devicetree/bindings/numa.txt". To pass dtb check I want
to convert the txt to yaml file.

My question is: how to handle the "numa-node-id" which is listed in
the numa.txt file. To my understanding, due to cpu/memory node need to
contain this property. I should find some binding files for cpu/memory
and add "numa-node-id" for cpu/memory.
For "cpu", I find a
"Documentation/devicetree/bindings/riscv/cpus.yaml", where I think I
can add a property of   "numa-node-id" to. Note the SG2042 is a RISC-V
chip.
But for "memory", where should I add  "numa-node-id" definition to?

Regards,

Chen Wang

Re: Question about writing binding files for numa

[Conor Dooley]

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Yo,

On Tue, Sep 19, 2023 at 01:33:16PM +0800, Chen Wang wrote:
> Hi, I am working on writing dts for a new SOC - SG2042, you can see
> the changes on https://github.com/unicornx/linux-riscv/commit/ee862fc4ebeade32bff00ad014d6b0513c0942a7.
> This hardware uses a NUMA architecture,  so a "distance-map" node is
> added and several "numa-node-id" are added for cpu/memory. The problem
> is I find there is no YAML binding for numa, I only find
> "Documentation/devicetree/bindings/numa.txt". To pass dtb check I want
> to convert the txt to yaml file.
> 
> My question is: how to handle the "numa-node-id" which is listed in
> the numa.txt file. To my understanding, due to cpu/memory node need to
> contain this property. I should find some binding files for cpu/memory
> and add "numa-node-id" for cpu/memory.
> For "cpu", I find a
> "Documentation/devicetree/bindings/riscv/cpus.yaml", where I think I
> can add a property of   "numa-node-id" to. Note the SG2042 is a RISC-V
> chip.
> But for "memory", where should I add  "numa-node-id" definition to?

Is it not already present in dt-schema?

https://github.com/search?q=repo%3Adevicetree-org%2Fdt-schema%20numa-node-id&type=code

Cheers,
Conor.


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