linux-kernel - RE: [PATCH 13/15] arm: dts: r8a7743: Add missing OPP properties for CPUs

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Date:   Tue, 29 May 2018 13:33:25 +0000
From:   Biju Das <biju.das@...renesas.com>
To:     Simon Horman <horms@...ge.net.au>,
        Viresh Kumar <viresh.kumar@...aro.org>
CC:     "arm@...nel.org" <arm@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "ionela.voinescu@....com" <ionela.voinescu@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "chris.redpath@....com" <chris.redpath@....com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 13/15] arm: dts: r8a7743: Add missing OPP properties for
 CPUs

Hi All,

I have tested this patch on RZ/G1M and I didn't find any issues. r8a7743 is similar to r8a7791. So I assume you will apply the same patch for other R-SoC devices as well.

Apart from this, maybe we need to update the OPP binding documentation. i.e., extend the  operating- point usage to other cores in the cluster (Binding 1: operating-points).

Regards,
Biju

> -----Original Message-----
> From: Simon Horman [mailto:horms@...ge.net.au]
> Sent: 28 May 2018 12:59
> To: Viresh Kumar <viresh.kumar@...aro.org>
> Cc: arm@...nel.org; Magnus Damm <magnus.damm@...il.com>; Rob
> Herring <robh+dt@...nel.org>; Mark Rutland <mark.rutland@....com>;
> Vincent Guittot <vincent.guittot@...aro.org>; ionela.voinescu@....com;
> Daniel Lezcano <daniel.lezcano@...aro.org>; chris.redpath@....com; linux-
> renesas-soc@...r.kernel.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; Biju Das <biju.das@...renesas.com>
> Subject: Re: [PATCH 13/15] arm: dts: r8a7743: Add missing OPP properties for
> CPUs
>
> On Mon, May 28, 2018 at 04:28:31PM +0530, Viresh Kumar wrote:
> > On 28-05-18, 11:23, Simon Horman wrote:
> > > [Cc Biju Das]
> > >
> > > On Fri, May 25, 2018 at 04:01:59PM +0530, Viresh Kumar wrote:
> > > > The OPP properties, like "operating-points", should either be
> > > > present for all the CPUs of a cluster or none. If these are
> > > > present only for a subset of CPUs of a cluster then things will
> > > > start falling apart as soon as the CPUs are brought online in a
> > > > different order. For example, this will happen because the
> > > > operating system looks for such properties in the CPU node it is
> > > > trying to bring up, so that it can create an OPP table.
> > > >
> > > > Add such missing properties.
> > > >
> > > > Fix other missing property (clock latency) as well to make it all
> > > > work.
> > > >
> > > > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> > >
> > > Thanks, this looks good to me and it looks like it should have:
> > >
> > > Fixes: 0417814ea140 ("ARM: dts: r8a7743: Add OPP table for frequency
> > > scaling")
> >
> > Sure.
> >
> > Will you be picking this patch directly and send it part of your pull
> > request ? Maybe add Fixes tag then only ?
>
> Yes, that is my plan. I can handle adding the Fixes tag.
> But I'll wait to see if Bjiu has an feedback first.



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