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

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Message-ID: <3da5c9b1f93699634aad997b77536a92@kernel.org>
Date:   Tue, 10 Nov 2020 18:08:31 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Thierry Reding <thierry.reding@...il.com>
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 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.

Thanks,

         M.