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

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Date:   Tue, 5 Jul 2022 09:38:21 +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 04-07-22, 21:04, Dmitry Osipenko wrote:
> On 7/4/22 18:52, Viresh Kumar wrote:
> > On 04-07-22, 16:17, Dmitry Osipenko wrote:
> >> Actually the freq was 0 and it was 1 on the next loop like you suggested.
> >>
> >> Previously, the _read_opp_key() was always reading the opp-hz. Now it
> >> skips reading the rates in _read_rate() because opp_table->clk_count=0
> >> for the tegra30-devfreq driver the uses devm_pm_opp_of_add_table_noclk().
> > 
> > This is exactly what I wrote in an earlier email :)
> > 
> > Anyway, I have pushed two patches on top of my opp/linux-next branch
> > and they should fix it in a good way now I suppose. Can you please
> > give that a try.
> > 
> > This is how the diff looks like:
> > 
> > PM / devfreq: tegra30: Register config_clks helper
> > 
> > There is a corner case with Tegra30, where we want to skip clk
> > configuration via dev_pm_opp_set_opp(), but still want the OPP core to
> > read the "opp-hz" property so we can find the right OPP via freq finding
> > helpers.
> > 
> > The OPP core provides support for the platforms to provide config_clks
> > helpers now, lets use them instead of devm_pm_opp_of_add_table_noclk()
> > to achieve the same result, as the OPP core won't parse the DT's
> > "opp-hz" property if the clock isn't provided.
> 
> Works, thanks you!
> 
> Tested-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

Finally, thanks a lot Dmitry :)

-- 
viresh