linux-kernel - Re: [PATCH v5 1/6] dt-bindings: thermal: mediatek: Rename thermal zone definitions for MT8186 and MT8188

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Date: Mon, 27 May 2024 10:14:41 +0200
From: Julien Panis <jpanis@...libre.com>
To: Conor Dooley <conor@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Nicolas Pitre <npitre@...libre.com>, "Rafael J. Wysocki"
 <rafael@...nel.org>, Zhang Rui <rui.zhang@...el.com>,
 Lukasz Luba <lukasz.luba@....com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v5 1/6] dt-bindings: thermal: mediatek: Rename thermal
 zone definitions for MT8186 and MT8188

On 5/24/24 20:24, Conor Dooley wrote:
> On Fri, May 24, 2024 at 11:04:34AM +0200, Julien Panis wrote:
>> Use thermal zone names that make more sense.
>>
>> Signed-off-by: Julien Panis <jpanis@...libre.com>
> Removing the defines is an ABI break. If these are all the same devices,
> but with more accurate naming, then keep the old defines and add new
> ones. However, the GPU1 define changes in the course of this patch which
> is more problematic.
>
> Why do these names even make more sense? Where did the old names come
> from and where do the new?
>
> Thanks,
> Conor.

Thanks for your comment.

For mt8188, the old name 'soc' came from a document by MTK, which is not
public: MT8188G Functional Specification. This document does not explain
what 'soc' are/do exactly, it just says that some temperature sensors are
located on them.

Then, there was a comment about these 'soc' names:
https://lore.kernel.org/all/ff12e104-da8b-4800-bfbe-a006ffe1b840@collabora.com/

So, I had a discussion with MTK to understand what these 'soc1/2/3'
are/do. The new names comes from this discussion and were given by MTK.

For the other SoC of this series (mt8186), the same kind of document exists
(MT8186G Functional Specification) and explains what 'soc' are/do exactly:
('cam', 'dsp', 'nna'...which are used in 'mt8186.dtsi').
Using the same logic in 'mt8188.dtsi' would be more consistent. Besides,
these names are more explicit.

Julien

>
>> ---
>>   include/dt-bindings/thermal/mediatek,lvts-thermal.h | 12 ++++++------
>>   1 file changed, 6 insertions(+), 6 deletions(-)
>>
>> diff --git a/include/dt-bindings/thermal/mediatek,lvts-thermal.h b/include/dt-bindings/thermal/mediatek,lvts-thermal.h
>> index bf95309d2525..ddc7302a510a 100644
>> --- a/include/dt-bindings/thermal/mediatek,lvts-thermal.h
>> +++ b/include/dt-bindings/thermal/mediatek,lvts-thermal.h
>> @@ -24,7 +24,7 @@
>>   #define MT8186_BIG_CPU1	5
>>   #define MT8186_NNA		6
>>   #define MT8186_ADSP		7
>> -#define MT8186_MFG		8
>> +#define MT8186_GPU		8
>>   
>>   #define MT8188_MCU_LITTLE_CPU0	0
>>   #define MT8188_MCU_LITTLE_CPU1	1
>> @@ -34,11 +34,11 @@
>>   #define MT8188_MCU_BIG_CPU1	5
>>   
>>   #define MT8188_AP_APU		0
>> -#define MT8188_AP_GPU1		1
>> -#define MT8188_AP_GPU2		2
>> -#define MT8188_AP_SOC1		3
>> -#define MT8188_AP_SOC2		4
>> -#define MT8188_AP_SOC3		5
>> +#define MT8188_AP_GPU0		1
>> +#define MT8188_AP_GPU1		2
>> +#define MT8188_AP_ADSP		3
>> +#define MT8188_AP_VDO		4
>> +#define MT8188_AP_INFRA		5
>>   #define MT8188_AP_CAM1		6
>>   #define MT8188_AP_CAM2		7
>>   
>>
>> -- 
>> 2.37.3
>>