linux-kernel - Re: [PATCH v13 1/2] dt-bindings: cpufreq: Introduce QCOM CPUFREQ Firmware bindings

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Message-ID: <20181217204547.GA11590@bogus>
Date:   Mon, 17 Dec 2018 14:45:47 -0600
From:   Rob Herring <robh@...nel.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Taniya Das <tdas@...eaurora.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        devicetree@...r.kernel.org, skannan@...eaurora.org,
        linux-arm-msm@...r.kernel.org, evgreen@...gle.com,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v13 1/2] dt-bindings: cpufreq: Introduce QCOM CPUFREQ
 Firmware bindings

On Thu, Dec 13, 2018 at 09:32:59PM -0800, Stephen Boyd wrote:
> Quoting Taniya Das (2018-12-13 20:10:23)
> > Add QCOM cpufreq firmware device bindings for Qualcomm Technology Inc's
> > SoCs. This is required for managing the cpu frequency transitions which are
> > controlled by the hardware engine.
> > 
> > Signed-off-by: Taniya Das <tdas@...eaurora.org>
> > ---
> 
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> 
> except one question below for Rob.
> 
> > diff --git a/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt b/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt
> > new file mode 100644
> > index 0000000..33856947
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.txt
> > @@ -0,0 +1,172 @@
> > +Qualcomm Technologies, Inc. CPUFREQ Bindings
> > +
> > +CPUFREQ HW is a hardware engine used by some Qualcomm Technologies, Inc. (QTI)
> > +SoCs to manage frequency in hardware. It is capable of controlling frequency
> > +for multiple clusters.
> > +
> > +Properties:
> > +- compatible
> > +       Usage:          required
> > +       Value type:     <string>
> > +       Definition:     must be "qcom,cpufreq-hw".
> > +
> > +- clocks
> > +       Usage:          required
> > +       Value type:     <phandle> From common clock binding.
> > +       Definition:     clock handle for XO clock and GPLL0 clock.
> > +
> > +- clock-names
> > +       Usage:          required
> > +       Value type:     <string> From common clock binding.
> > +       Definition:     must be "xo", "alternate".
> > +
> > +- reg
> > +       Usage:          required
> > +       Value type:     <prop-encoded-array>
> > +       Definition:     Addresses and sizes for the memory of the HW bases in
> > +                       each frequency domain.
> > +- reg-names
> > +       Usage:          Optional
> > +       Value type:     <string>
> > +       Definition:     Frequency domain name i.e.
> > +                       "freq-domain0", "freq-domain1".
> > +
> > +- #freq-domain-cells:
> 
> I still wonder if this should be #qcom,freq-domain-cells, but if Rob is
> OK I won't complain.

Probably should be. Though I did give my R-by without.

Rob