linux-kernel - Re: [PATCH] ARM: dts: exynos: add cpu perf counters to Exynos54xx boards

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Date:   Sat, 21 Oct 2017 22:14:01 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Marian Mihailescu <mihailescu2m@...il.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: exynos: add cpu perf counters to Exynos54xx
 boards

On Sat, Oct 21, 2017 at 05:54:31PM +1030, Marian Mihailescu wrote:
> Hi Robin,
> 
> Apologies, I did not really check which cluster is described for the
> 5410 (since 5422 boots from the A7).
> 
> Should I define both pmu nodes (w/o interrupt affinity) in the
> exynos54xx,dtsi, and set the status property to "disabled"?
> And then add the interrupt affinity to the SoC variant, and enable
> them as required...

After putting it under common exynos54xx you would have to anyway
override/extend most of the nodes so I think there is no much sense for
that. Instead it should be in exynos5410.dtsi and exynos5422.dtsi.

> 
> The problem that I see however is that, while 5410 is easy to deal
> with (it has the cpus defined in exynos5420.dtsi for all boards), 542x
> variants have the cpus included in the board dts. So there would be
> the same pmu nodes with interrupt affinity copied in all 542x and 5800
> boards dts (and there are several of them), instead of being included
> in exynos542x.dtsi...

You mean exynos5420-cpus.dtsi, not board DTS?

For exynos542x/5800 you could indeed add it directly to
exynos542x-cpus.dtsi, following existing pattern about cpus (with
comment).


Best regards,
Krzysztof