linux-kernel - Re: [PATCH v3 1/6] dt-bindings: opp: Introduce opp-peak-KBps and opp-avg-KBps bindings

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Message-ID: <CAGETcx-kUM7MqNYowwNAL1Q0bnFzxPEO6yMg0YTkk16=OnPdmg@mail.gmail.com>
Date:   Wed, 17 Jul 2019 13:29:47 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "Sweeney, Sean" <seansw@....qualcomm.com>,
        daidavid1@...eaurora.org, Rajendra Nayak <rnayak@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Evan Green <evgreen@...omium.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/6] dt-bindings: opp: Introduce opp-peak-KBps and
 opp-avg-KBps bindings

On Wed, Jul 17, 2019 at 12:54 AM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> On 02-07-19, 18:10, Saravana Kannan wrote:
> > Interconnects often quantify their performance points in terms of
> > bandwidth. So, add opp-peak-KBps (required) and opp-avg-KBps (optional) to
> > allow specifying Bandwidth OPP tables in DT.
> >
> > opp-peak-KBps is a required property that replace opp-hz for Bandwidth OPP
> > tables.
> >
> > opp-avg-KBps is an optional property that can be used in Bandwidth OPP
> > tables.
> >
> > Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> > ---
> >  Documentation/devicetree/bindings/opp/opp.txt | 15 ++++++++++++---
> >  1 file changed, 12 insertions(+), 3 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
> > index 76b6c79604a5..c869e87caa2a 100644
> > --- a/Documentation/devicetree/bindings/opp/opp.txt
> > +++ b/Documentation/devicetree/bindings/opp/opp.txt
> > @@ -83,9 +83,14 @@ properties.
> >
> >  Required properties:
> >  - opp-hz: Frequency in Hz, expressed as a 64-bit big-endian integer. This is a
> > -  required property for all device nodes but devices like power domains. The
> > -  power domain nodes must have another (implementation dependent) property which
> > -  uniquely identifies the OPP nodes.
> > +  required property for all device nodes but for devices like power domains or
> > +  bandwidth opp tables. The power domain nodes must have another (implementation
> > +  dependent) property which uniquely identifies the OPP nodes. The interconnect
> > +  opps are required to have the opp-peak-bw property.
>
>                                    ??

Sorry, what's the question? Was this an accidental email?

-Saravana

>
> > +
> > +- opp-peak-KBps: Peak bandwidth in kilobytes per second, expressed as a 32-bit
> > +  big-endian integer. This is a required property for all devices that don't
> > +  have opp-hz. For example, bandwidth OPP tables for interconnect paths.
> >
> >  Optional properties:
> >  - opp-microvolt: voltage in micro Volts.
> > @@ -132,6 +137,10 @@ Optional properties:
> >  - opp-level: A value representing the performance level of the device,
> >    expressed as a 32-bit integer.
> >
> > +- opp-avg-KBps: Average bandwidth in kilobytes per second, expressed as a
> > +  32-bit big-endian integer. This property is only meaningful in OPP tables
> > +  where opp-peak-KBps is present.
> > +
> >  - clock-latency-ns: Specifies the maximum possible transition latency (in
> >    nanoseconds) for switching to this OPP from any other OPP.
> >
> > --
> > 2.22.0.410.gd8fdbe21b5-goog
>
> --
> viresh
>
> --
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