linux-kernel - Re: [PATCH v6 51/52] PM / devfreq: tegra30: Support interconnect and OPPs from device-tree

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Date:   Mon, 2 Nov 2020 23:00:33 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     cwchoi00@...il.com
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Viresh Kumar <vireshk@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-tegra@...r.kernel.org,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 51/52] PM / devfreq: tegra30: Support interconnect and
 OPPs from device-tree

01.11.2020 18:44, Chanwoo Choi пишет:
>>> I recommend that you use dev_pm_opp_of_get_opp_desc_node(&pdev->dev)
>>> to check whether a device contains opp-table or not.
>> I'm not sure what are the benefits, this will make code less
>> expressive/readable and we will need to add extra of_node_put(), which
>> device_property_present() handles for us.
>>
>> Could you please give the rationale?
> IMO, 'operating-points-v2' word was defined on OPP core. I think that
> the external user
> of OPP better to use the public helper function instead of using the
> interval definition
> or value of OPP core directly. Basically, I prefer the provided helper
> function if there.
> But, it is not critical and doesn't affect the operation. If you want
> to keep, it is ok.
> 

I'll prefer to keep it since it's better for the readability of the
code, thanks.