linux-kernel - Re: [PATCH] arm: bcm2835: Add the PMU to the devicetree.

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Message-ID: <alpine.DEB.2.21.1805171530080.8529@macbook-air>
Date:   Thu, 17 May 2018 15:31:38 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>,
        linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] arm: bcm2835: Add the PMU to the devicetree.

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