linux-kernel - Re: [PATCH] dt-bindings: arm: cpus: Deprecate Qualcomm generic compatibles

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Message-ID: <20260115201321.GA1101678-robh@kernel.org>
Date: Thu, 15 Jan 2026 14:13:21 -0600
From: Rob Herring <robh@...nel.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: arm: cpus: Deprecate Qualcomm generic
 compatibles

On Thu, Jan 15, 2026 at 11:19:47AM +0100, Konrad Dybcio wrote:
> On 1/15/26 9:35 AM, Krzysztof Kozlowski wrote:
> > Move four compatibles for Qualcomm Krait, Kryo, Oryon and Scorpion
> > custom CPU cores out of the enum into separate one with deprecated: true
> > annotation, because these are too generic names.
> > 
> > These are names of the families and there are significant differences
> > within individual processors, e.g. Kryo6xx can based on architectures
> > from Cortex-X2, A710, A510 to A78 and probably more.
> > 
> > Just like other vendor processors are differentiated, also Qualcomm CPUs
> > should come with specific compatibles.
> > 
> > Cc: Bjorn Andersson <andersson@...nel.org>
> > Cc: Konrad Dybcio <konradybcio@...nel.org>
> > Cc: linux-arm-msm@...r.kernel.org
> > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
> > ---
> 
> [...]
> 
> > -      - arm,armv8 # Only for s/w models
> 
> I'm still bitter about this one existing
> 
> $ rg '"arm,armv8"' arch -l | sort
> 
> arch/arm64/boot/dts/arm/foundation-v8.dtsi
> 
> This makes some sense (see [1])
> 
> arch/arm64/boot/dts/arm/fvp-base-revc.dts
> arch/arm64/boot/dts/arm/rtsm_ve-aemv8a.dts
> 
> These seem to be spawned with a specific virtualized Cortex type

No, these are "generic" cores where arch features can be turned on/off 
and configured.

> 
> arch/arm64/boot/dts/nvidia/tegra264.dtsi

It's hard to keep new ones from sneaking in...

Rob