linux-kernel - Re: [PATCH 5/8] OPP: Allow multiple clocks for a device

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Message-ID: <20220630005028.fddtcbkoksbygwc5@vireshk-i7>
Date:   Thu, 30 Jun 2022 06:20:28 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     Jon Hunter <jonathanh@...dia.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel@...r.kernel.org,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 5/8] OPP: Allow multiple clocks for a device

On 29-06-22, 21:33, Dmitry Osipenko wrote:
> Today I noticed that tegra30-devfreq driver now fails to probe because
> dev_pm_opp_find_freq_ceil() fails with -ERANGE. This patch is guilty for
> that. Could you please take a look?

I remember this corner case now [1] and it was easy to miss this. So
you want the OPP core to still parse the DT to read opp-hz, but don't
want dev_pm_opp_set_opp() to update the clock rate for it.

What was the reason for this again ?

I have a couple of solutions in mind, but one may be other than second
and so want to know the real issue at hand first.

-- 
viresh

[1] https://lore.kernel.org/lkml/71451eb2-46b2-1ea0-efcc-0811568159a4@gmail.com/