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

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Message-ID: <alpine.DEB.2.21.1805171233500.7984@macbook-air>
Date:   Thu, 17 May 2018 12:34:56 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Stefan Wahren <stefan.wahren@...e.com>
cc:     Florian Fainelli <f.fainelli@...il.com>,
        Eric Anholt <eric@...olt.net>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm: bcm2835: Add the PMU to the devicetree.

On Thu, 17 May 2018, Stefan Wahren wrote:

> 
> > Eric Anholt <eric@...olt.net> hat am 17. Mai 2018 um 15:17 geschrieben:
> > 
> > 
> > The a53 and a7 counters seem to match up, so we advertise a7 so that
> > arm32 can probe.

so how closely did you look at the a53/a7 differences?  I see some major 
differences, especially with the CPU_CYCLES event (0xff vs 0x11).

The proper fix here might be to add a cortex-a53 PMU entry to the armv7 
code rather than trying to treat it as a cortex-a7.

Vince