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Subject: Re: [PATCH 1/4] PM / EM: and devices to Energy Model
To:     Dietmar Eggemann <dietmar.eggemann@arm.com>,
        linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
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References: <20200116152032.11301-1-lukasz.luba@arm.com>
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 <17b77e0c-9455-0479-d37b-c57717c784c7@arm.com>
 <d0b90b97-3604-d4f4-b873-3879a9221532@arm.com>
From:   Lukasz Luba <lukasz.luba@arm.com>
Message-ID: <38307e88-f7ff-bc2a-bbce-5e508e275526@arm.com>
Date:   Mon, 20 Jan 2020 15:36:46 +0000
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On 1/20/20 3:11 PM, Dietmar Eggemann wrote:
> On 20/01/2020 15:53, Dietmar Eggemann wrote:
>> On 16/01/2020 16:20, lukasz.luba@arm.com wrote:
>>> From: Lukasz Luba <lukasz.luba@arm.com>
> 
> [...]
> 
>>> +enum em_type {
>>> +	EM_SIMPLE,
>>> +	EM_CPU,
>>> +};
>>
>> s/EM_SIMPLE/EM_DEV ?
>>
>> Right now I only see energy models and _one_ specific type (the CPU EM).
>> So a tag 'is a CPU EM' would suffice. No need for EM_SIMPE ...
> 
> Wait, you even have
> 
> struct em_device {
>          struct em_perf_domain *em_pd;
>          struct device *dev;
>          ...
> }
> 
> static bool _is_cpu_device(struct device *dev)
> 
> Shouldn't this be enough to distinguish between EM and special CPU EM
> under the API? Even when required to use container_of() to get from
> em_perf_domain to device.
> 

Agree, I will remove this em_type related code.

Lukasz