linux-kernel - Re: [PATCH v5 1/4] PM / devfreq: Register devfreq as a cooling device on demand

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Date:   Mon, 8 Mar 2021 13:00:21 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     cwchoi00@...il.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, steven.price@....com,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [PATCH v5 1/4] PM / devfreq: Register devfreq as a cooling device
 on demand

On 08/03/2021 10:53, Lukasz Luba wrote:
> Hi Daniel,
> 
> In general the approach is good. If there is a special GPU driver, which
> would like to provide 'struct devfreq_cooling_power *' it would leave
> 'is_cooling_device=false' and register manually:
> devfreq_cooling_em_register(df, dfc_power);
> 
> Please find only a few minor comments below.
> 
> 
> On 3/8/21 9:16 AM, Daniel Lezcano wrote:
>> Currently the default behavior is to manually having the devfreq
>> backend to register themselves as a devfreq cooling device.
>>
>> Instead of adding the code in the drivers for the thermal cooling
>> device registering, let's provide a flag in the devfreq's profile to
>> tell the common devfreq code to register the newly created devfreq as
>> a cooling device.
>>
>> Suggested-by: Chanwoo Choi <cwchoi00@...il.com>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> ---

[ ... ]

>> +    struct thermal_cooling_device *cdev;
> 
> The linux/thermal.h for 'cdev' would be needed in this header.

May be just a forward declaration ?

struct thermal_cooling_device;

>> +
>>       struct notifier_block nb_min;
>>       struct notifier_block nb_max;
>>   };
>>
> 
> With this small changes:
> 
> Reviewed-by: Lukasz Luba <lukasz.luba@....com>
> 
> Regards,
> Lukasz


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