linux-kernel - Re: [PATCH 1/3] dt-bindings: thermal: samsung: Add tmu-name and sensor-index-ranges properties

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Message-ID: <f6acdd01-8847-4282-b375-f8e564be81d2@kernel.org>
Date: Sat, 30 Aug 2025 11:06:49 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Shin Son <shin.son@...sung.com>,
 Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
 "Rafael J . Wysocki" <rafael@...nel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>,
 Lukasz Luba <lukasz.luba@....com>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: thermal: samsung: Add tmu-name and
 sensor-index-ranges properties

On 25/08/2025 08:49, Shin Son wrote:
> The exynosautov920 TMU requires per-sensor interrupt enablement
> for its critical trip points.
> Add two new DT properties to the Samsung thermal bindings
> to support this requirement:
> 
> - **tmu-name**: an explicit identifier for each TMU,
> 		used to skip specific sensors
> (e.g., sensor 5 is temporarily disabled on the TMU_SUB1 block).
> 
> - **sensor-index-ranges**: defines valid sensor index ranges
> 			   for the driver’s bitmap in private data,
> 			   enabling per-sensor interrupt setup and data access.
> 
> Signed-off-by: Shin Son <shin.son@...sung.com>
> ---
>  .../thermal/samsung,exynos-thermal.yaml       | 23 ++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/samsung,exynos-thermal.yaml b/Documentation/devicetree/bindings/thermal/samsung,exynos-thermal.yaml
> index 29a08b0729ee..420fb7a944e3 100644
> --- a/Documentation/devicetree/bindings/thermal/samsung,exynos-thermal.yaml
> +++ b/Documentation/devicetree/bindings/thermal/samsung,exynos-thermal.yaml
> @@ -8,6 +8,7 @@ title: Samsung Exynos SoC Thermal Management Unit (TMU)
>  
>  maintainers:
>    - Krzysztof Kozlowski <krzk@...nel.org>
> +  - Shin Son <shin.son@...sung.com>

This needs also explanation in commit msg.

>  
>  description: |
>    For multi-instance tmu each instance should have an alias correctly numbered
> @@ -27,6 +28,7 @@ properties:
>        - samsung,exynos5420-tmu-ext-triminfo
>        - samsung,exynos5433-tmu
>        - samsung,exynos7-tmu
> +      - samsung,exynosautov920-tmu
>  
>    clocks:
>      minItems: 1
> @@ -62,11 +64,29 @@ properties:
>      minItems: 1
>  
>    '#thermal-sensor-cells':
> -    const: 0
> +    enum:
> +      - 0
> +      - 1
>  
>    vtmu-supply:
>      description: The regulator node supplying voltage to TMU.
>  
> +  tmu-name:

Generic property? Where is it defined.

> +    description: The TMU hardware name.

Anyway, you do not get instance IDs. I talked about this at OSSE25.

> +    $ref: /schemas/types.yaml#/definitions/string-array
> +    minItems: 1
> +    maxItems: 1
> +
> +  sensor-index-ranges:

Where is the property defined? You keep adding generic properties.

> +    description: |
> +      Valid Sensor index ranges for the TMU hardware.

I don't understand what is this for.

> +
> +      Note:: On the ExynosautoV920 variant, the fifth sensor in the TMU SUB1 is disabled,
> +      so the driver skips it when matching by tmu-name.

That's not name, so why are you referring to tmu-name? And driver has
nothing to do here. Describe hardware.

None of this is really correct. :/

Best regards,
Krzysztof