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: <CAGETcx8X2XuC5E2pxRU_7fTXYYJ+8hD-_TRvUPh5sE+oGPWgfA@mail.gmail.com>
Date:   Fri, 26 Jul 2019 12:08:41 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Georgi Djakov <georgi.djakov@...aro.org>
Cc:     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>,
        David Dai <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 Fri, Jul 26, 2019 at 9:24 AM Georgi Djakov <georgi.djakov@...aro.org> wrote:
>
> Hi Saravana,
>
> On 7/3/19 04:10, 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.
> > +
> > +- opp-peak-KBps: Peak bandwidth in kilobytes per second, expressed as a 32-bit
>
> As Rob already mentioned, KBps should be documented. See [1].
>

Will do. Thanks for the pointer.

-Saravana