linux-kernel - Re: [PATCH] thermal/core: Introduce user trip points

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Date: Tue, 2 Jul 2024 18:31:52 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Rob Herring <robh@...nel.org>, linux-pm@...r.kernel.org,
 Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] thermal/core: Introduce user trip points

On 02/07/2024 13:03, Rafael J. Wysocki wrote:

[ ... ]

>>> Trips cannot be created on the fly ATM.
>>>
>>> What can be done is to create trips that are invalid to start with and
>>> then set their temperature via sysfs.  This has been done already for
>>> quite a while AFAICS.
>>
>> Yes, I remember that.
>>
>> I would like to avoid introducing more weirdness in the thermal
>> framework which deserve a clear ABI.
>>
>> What is missing to create new trip points on the fly ?
> 
> A different data structure to store them (essentially, a list instead
> of an array).
> 
> I doubt it's worth the hassle.
> 
> What's wrong with the current approach mentioned above?  It will need
> to be supported going forward anyway.

So when the "user trip point" option will be set, a thermal zone will 
have ~ten(?) user trip points initialized to an invalid temperature ?

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