linux-kernel - Re: [PATCH v2 0/3] thermal: Add support of multiple sensors

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Message-ID: <03fbaefa-de17-47f0-a48d-7b40e5df50f6@linaro.org>
Date: Tue, 30 Apr 2024 16:37:08 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Alexandre Bailon <abailon@...libre.com>, rafael@...nel.org,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc: rui.zhang@...el.com, lukasz.luba@....com, linux-pm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] thermal: Add support of multiple sensors


Hi Alexandre,

On 19/01/2024 12:08, Alexandre Bailon wrote:
> Following this comment [1], this updates thermal_of to support multiple
> sensors.
> 
> This has some limitations:
> - A sensor must have its own termal zone, even if it is also registered
>    inside a thermal zone supporting multiple sensors.
> - Only support weighted average

Is it possible to elaborate why this feature is needed ?

The thermal framework is able to aggregate the cooling device requests, 
so having multiple sensors aggregated or the cooling device requests is 
from my point of view the same.

I can imagine one reason to do that is to group the sensors in order to 
use the IPA because it won't work the setup mentioned above.

Is that the goal you want to achieve ?

> Changes in v2:
> - Rebased on 6.7
> - Seperated generic multi sensor and dt specfic code
> - Simplified the code
> - Drop min / max and only do weighted average (seems more adequate for IPA)
> 
> [1]: https://patchwork.kernel.org/comment/24723927/
> 
> Alexandre Bailon (3):
>    dt-bindings: thermal: Restore the thermal-sensors property
>    thermal: Add support of multi sensors to thermal_core
>    thermal: Add support of multi sensors to thermal_of
> 
>   .../bindings/thermal/thermal-zones.yaml       |   5 +-
>   drivers/thermal/Makefile                      |   1 +
>   drivers/thermal/thermal_core.h                |   7 +
>   drivers/thermal/thermal_multi.c               | 178 ++++++++++++++++++
>   drivers/thermal/thermal_of.c                  | 139 ++++++++++++++
>   5 files changed, 327 insertions(+), 3 deletions(-)
>   create mode 100644 drivers/thermal/thermal_multi.c
> 

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