linux-kernel - Re: [PATCH v7 1/2] dt-bindings: cpufreq: Introduce QCOM CPUFREQ Firmware bindings

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Date:   Wed, 8 Aug 2018 09:37:38 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Taniya Das <tdas@...eaurora.org>, skannan@...eaurora.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Amit Nischal <anischal@...eaurora.org>,
        devicetree@...r.kernel.org, robh@...nel.org,
        amit.kucheria@...aro.org, evgreen@...gle.com,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v7 1/2] dt-bindings: cpufreq: Introduce QCOM CPUFREQ
 Firmware bindings

On Tue, Aug 07, 2018 at 11:15:02PM -0700, Stephen Boyd wrote:
> Quoting Taniya Das (2018-08-07 19:46:01)
[...]

> > Sudeep,
> > 
> > Earlier the design was the freq_domain would take the CPU phandles
> > 
> > freq_domain:
> >    cpus = <&cpu0 &cpu1....>;
> > 
> 
> I believe Sudeep is recommending something I recommended earlier. It
> would look like:
> 
>    cpu7 {
> 	   qcom,freq-domain = <&cpufreq_hw 1>;
>    }
> 
> to indicate that cpu7 is in cpufreq_hw's frequency domain #1. That
> should probably be called clk domain BTW.
>

Thanks Stephen, that's exactly what I meant. You have explained all the
details saving me time :)

> If that was done with a phandle and a single cell, then we should have
> something similar on the cpufreq_hw node side indicating how to parse
> the cells in qcom,freq-domain. A property like #qcom,freq-domain-cells =
> <1> to indicate that one u32 follows the phandle.
>

As Saravana mentions in the other email I can't believe it's just made up
of logical CPU numbers. If that's the case is it software configurable.

--
Regards,
Sudeep