linux-kernel - Re: [PATCH v2 1/6] soc: qcom: rpmpd: Add a powerdomain driver to model corners

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Date:   Thu, 31 May 2018 09:50:55 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Andy Gross <andy.gross@...aro.org>, devicetree@...r.kernel.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        collinsd@...eaurora.org
Subject: Re: [PATCH v2 1/6] soc: qcom: rpmpd: Add a powerdomain driver to
 model corners



On 05/30/2018 06:14 PM, Ulf Hansson wrote:
> [...]
> 
>>>> +
>>>> +static DEFINE_MUTEX(rpmpd_lock);
>>>> +
>>>> +/* msm8996 RPM powerdomains */
>>>> +DEFINE_RPMPD_CORN_SMPA(msm8996, vddcx, vddcx_ao, 1);
>>>> +DEFINE_RPMPD_CORN_SMPA(msm8996, vddmx, vddmx_ao, 2);
>>>> +DEFINE_RPMPD_CORN_LDOA(msm8996, vddsscx, 26);
>>>> +
>>>> +DEFINE_RPMPD_VFC_SMPA(msm8996, vddcx_vfc, 1);
>>>> +DEFINE_RPMPD_VFC_LDOA(msm8996, vddsscx_vfc, 26);
>>>> +
>>>> +static struct rpmpd *msm8996_rpmpds[] = {
>>>> +       [0] = &msm8996_vddcx,
>>>> +       [1] = &msm8996_vddcx_ao,
>>>> +       [2] = &msm8996_vddcx_vfc,
>>>> +       [3] = &msm8996_vddmx,
>>>> +       [4] = &msm8996_vddmx_ao,
>>>> +       [5] = &msm8996_vddsscx,
>>>> +       [6] = &msm8996_vddsscx_vfc,
>>>> +};
>>>
>>> It's not my call, but honestly the above all macros makes the code
>>> less readable.
>>
>> This is all static data per SoC. The macros will keep the new additions
>> needed for every new SoC to a minimal. Currently this supports only
>> msm8996.
> 
> Right, that's fine then.
> 
>>
>>>
>>> Anyway, I think you should convert to allocate these structs
>>> dynamically from the heap (kzalloc/kcalloc), instead of statically as
>>> above.
> 
> However, I assume this is still doable!?

Perhaps it is, but is there any specific advantage of constructing these structures
dynamically vs statically, given they are static data?
Most other powerdomain/clock/regulator drivers I see do it statically, and thats
what I followed.

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