linux-kernel - Re: [PATCH V2 1/2] opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE

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Date:   Tue, 20 Oct 2020 10:35:57 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     ulf.hansson@...aro.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>, Pavel Machek <pavel@....cz>,
        Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>, nks@...wful.org,
        georgi.djakov@...aro.org, Stephan Gerhold <stephan@...hold.net>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH V2 1/2] opp: Allow dev_pm_opp_get_opp_table() to return
 -EPROBE_DEFER

On 19-10-20, 15:10, Sudeep Holla wrote:
> On Mon, Oct 19, 2020 at 04:05:35PM +0530, Viresh Kumar wrote:
> > On 19-10-20, 11:12, Sudeep Holla wrote:
> > > Yes it has clocks property but used by SCMI(for CPUFreq/DevFreq) and not
> > > by any clock provider driver. E.g. the issue you will see if "clocks"
> > > property is used instead of "qcom,freq-domain" on Qcom parts.
> > 
> > Okay, I understand. But what I still don't understand is why it fails
> > for you. You have a clocks property in DT for the CPU, the OPP core
> > tries to get it and will get deferred-probed, which will try probing
> > at a later point of time and it shall work then. Isn't it ?
> >
> 
> Nope unfortunately. We don't have clock provider, so clk_get will
> never succeed and always return -EPROBE_DEFER.

Now this is really bad, you have a fake clocks property, how is the
OPP core supposed to know it ? Damn.

-- 
viresh