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Subject: Re: [PATCH 1/4] PM / EM: and devices to Energy Model
From:   Dietmar Eggemann <dietmar.eggemann@arm.com>
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Date:   Mon, 20 Jan 2020 16:11:21 +0100
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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.