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From: Vince Weaver <vincent.weaver@maine.edu>
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Date: Thu, 17 May 2018 15:31:38 -0400 (EDT)
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To: Peter Zijlstra <peterz@infradead.org>
cc: Stefan Wahren <stefan.wahren@i2se.com>, Ingo Molnar <mingo@redhat.com>,
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        Eric Anholt <eric@anholt.net>, linux-arm-kernel@lists.infradead.org,
        Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH] arm: bcm2835: Add the PMU to the devicetree.
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On Thu, 17 May 2018, Vince Weaver wrote:

> On Thu, 17 May 2018, Peter Zijlstra wrote:
> with cortex-a7 now, would it be possible to later drop that if proper 
> cortex-a53 support is added to the armv7 pmu driver?  Or would that lead 
> to all kinds of back-compatability mess?

For what it's worth, the pi-foundation kernel bcm2710 device tree file 
does:

		arm-pmu {
#ifdef RPI364
			compatible = "arm,armv8-pmuv3", "arm,cortex-a7-pmu";
#else
			compatible = "arm,cortex-a7-pmu";
#endif
			interrupt-parent = <&local_intc>;
			interrupts = <9>;
		};


Which is probably where I was getting the arm,armv8-pmuv3 from in my 
original patch.

Vince