linux-kernel - Re: [PATCH] arm/arm64: dts: Drop "arm,armv8-pmuv3" compatible usage

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Date: Mon, 15 Apr 2024 12:15:34 -0500
From: Rob Herring <robh@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Bjorn Andersson <quic_bjorande@...cinc.com>, soc@...nel.org, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Florian Fainelli <florian.fainelli@...adcom.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Dinh Nguyen <dinguyen@...nel.org>, 
	Tsahee Zidenberg <tsahee@...apurnalabs.com>, Antoine Tenart <atenart@...nel.org>, 
	Khuong Dinh <khuong@...amperecomputing.com>, Liviu Dudau <liviu.dudau@....com>, 
	Sudeep Holla <sudeep.holla@....com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>, 
	Robert Richter <rric@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, 
	Fabio Estevam <festevam@...il.com>, "Paul J. Murphy" <paul.j.murphy@...el.com>, 
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	Thierry Reding <thierry.reding@...il.com>, Jonathan Hunter <jonathanh@...dia.com>, 
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	Michal Simek <michal.simek@....com>, devicetree@...r.kernel.org, 
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Subject: Re: [PATCH] arm/arm64: dts: Drop "arm,armv8-pmuv3" compatible usage

On Mon, Apr 15, 2024 at 12:05 PM Rob Herring <robh@...nel.org> wrote:
>
> On Mon, Apr 15, 2024 at 11:52 AM Dmitry Baryshkov
> <dmitry.baryshkov@...aro.org> wrote:
> >
> > On Mon, 15 Apr 2024 at 16:46, Bjorn Andersson <quic_bjorande@...cinc.com> wrote:
> > >
> > > On Fri, Apr 12, 2024 at 05:28:51PM -0500, Rob Herring wrote:
> > > [..]
> > > >  arch/arm64/boot/dts/qcom/qcm2290.dtsi                | 2 +-
> > > >  arch/arm64/boot/dts/qcom/qdu1000.dtsi                | 2 +-
> > > >  arch/arm64/boot/dts/qcom/sdm630.dtsi                 | 2 +-
> > > >  arch/arm64/boot/dts/qcom/sdx75.dtsi                  | 2 +-
> > >
> > > Acked-by: Bjorn Andersson <andersson@...nel.org>
> >
> > Note, we'd need to override PMU compatibles in sdm636.dtsi and
> > sdm660.dtsi. Ideally it should come as the same patch.
>
> Uh, that's an A for reuse, but an F for readability... It's sdm632 as
> well. Will drop sdm630.

Actually, aren't those Kryo cores just Cortex-A53 derivatives? So the
A53 PMU compatible is an improvement over the generic one still. We
can't just add kryo260-pmu compatibles because that breaks
compatibility. We could have a fallback, but then that introduces a
pattern we don't want.

Rob