linux-kernel - Re: [PATCH] arm64: tegra186: Add missing CPU PMUs

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Message-ID: <20201110182212.GI2297135@ulmo>
Date:   Tue, 10 Nov 2020 19:22:12 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Nagarjuna Kristam <nkristam@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] arm64: tegra186: Add missing CPU PMUs

On Tue, Nov 10, 2020 at 06:08:31PM +0000, Marc Zyngier wrote:
> On 2020-11-10 17:36, Thierry Reding wrote:
> > On Tue, Oct 13, 2020 at 10:58:51AM +0100, Marc Zyngier wrote:
> > > Add the description of CPU PMUs for both the Denver and A57 clusters,
> > > which enables the perf subsystem.
> > > 
> > > Signed-off-by: Marc Zyngier <maz@...nel.org>
> 
> [...]
> 
> > > 
> > > +	pmu_denver {
> > > +		compatible = "nvidia,denver-pmu", "arm,armv8-pmuv3";
> > 
> > checkpatch complains that this isn't documented. Did I miss the DT
> > bindings patch or do we not have one for this?
> 
> We don't. But I don't think adding a compatible string for each
> and every micro-architecture makes much sense unless we have something
> useful to add to that compatible string. Such as a full description
> of the implementation specific events.

I'm wondering if this isn't going to upset Rob's json-schema bot and
make him mad.

Thierry

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