Re: [PATCH v2 1/3] dt-bindings: power: limits: Describe Qualcomm SPEL hardware

[Krzysztof Kozlowski <krzk@kernel.org>]

On 24/06/2026 22:41, Daniel Lezcano wrote:
> It allows power capping and read the average power consumption for a 
> specific device (or/and an energy counter)
> 
> Basically you can set a power constraint (power limit) to a device and 
> this one won't consume more than that power (the power limitation 
> strategy is managed under the hood by the firmware depending on the 
> device - lower OPP, idle injection, modem weaker signal, etc ...).
> 
> The RAPL or the SPEL have a hierarchical power limitation. For example:
> 
>                                      SoC
>                                       |
>                            ------------------------
>                           |                        |
>                       Cluster0                 Cluster1
>                           |                        |
>                  -----------------        -----------------
>                 |     |     |     |      |     |     |     |
>               CPU0  CPU1  CPU2  CPU3   CPU4  CPU5  CPU6  CPU7
> 
> 
> If you specify a power limit to 'SoC', then the power consumption of 
> Cluster0 + Cluster1 <= SoC
> 
> If Cluster0 power consumption decreases, then Cluster1 is allowed to use 
> more power until Cluster0 + Cluster1 <= SoC
> 
> For me it sounds reasonable to put the device description under power/limits


Yes, can go there. Some pieces of above explanation could be captured in
commit msg.


Best regards,
Krzysztof