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

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Message-ID: <59ae6b16-7866-413a-a1d2-4a735024c108@oss.qualcomm.com>
Date: Thu, 15 Jan 2026 11:19:47 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>,
        Rob Herring <robh@...nel.org>,
        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
Cc: 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 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

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

:(

[1] https://developer.arm.com/documentation/100961/1130/Foundation-Platform-introduction/Platform-overview/Processor-models-in-the-Foundation-Platform?lang=en

Konrad