linux-kernel - Re: [PATCH v5 13/36] PM / devfreq: tegra30: Use MC timings for building OPP table

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Date:   Fri, 28 Aug 2020 11:30:25 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>,
        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>,
        Mikko Perttunen <cyndis@...si.fi>
Cc:     linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v5 13/36] PM / devfreq: tegra30: Use MC timings for
 building OPP table

28.08.2020 04:47, Chanwoo Choi пишет:
> Hi,
...
>> Hence the NULL-checking is unnecessary.
>>
>> When I first encountered the of_device_get_match_data(), I was also
>> thinking that adding the NULL-checks is a good idea, but later on
>> somebody pointed out to me (maybe Thierry) that it's unnecessary to do.
> 
> OK. Thanks.
> 
>>
>>>> +
>>>> +	mc = tegra_get_memory_controller(soc_data->mc_compatible);
>>>> +	if (IS_ERR(mc))
>>>> +		return PTR_ERR(mc);
>>>
>>> You better to add error log.
>>
>> In practice we should get only -EPROBE_DEFER here ever. I'll consider
>> adding the message in the next revision, at least just for consistency.
> 
> In order to handle -EPROBE_DEFER, recommend the using of dev_err_probe().

Hello, Chanwoo!

Thank you for the suggestion! I wasn't aware about the dev_err_probe()
until recently and will use this new helper in the v6!

Thanks!