linux-kernel - Re: [PATCH] dt-bindings: interrupt-controller: arm,gic-v3: Make the v2 compat requirements explicit

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Message-ID: <4557c5fe-6c39-2014-65a4-c14dac98f902@linaro.org>
Date:   Sat, 9 Apr 2022 12:49:38 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marc Zyngier <maz@...nel.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>
Subject: Re: [PATCH] dt-bindings: interrupt-controller: arm,gic-v3: Make the
 v2 compat requirements explicit

On 09/04/2022 12:16, Marc Zyngier wrote:
> A common mistake when writing a device tree for a platform that is using
> GICv3 with ancient CPUs is to overlook the MMIO frames that implement
> the GICv2 compatibility feature, because this feature is implemented by
> the CPUs and not by the GIC itself.
> 
> The compatibility feature itself is optional (all the modern
> implementations have dropped it), but is present in all the ARM Ltd
> implementations of the ARMv8.0 architecture (A3x, A53, A57, A72, A73),
> and many others from various implementers.
> 
> Make it explicit that GICC, GICH and GICV are required for these CPUs.
> Also take this opportunity to update my email address, as people keep
> sending them to the wrong place...
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>
> ---
>  .../bindings/interrupt-controller/arm,gic-v3.yaml         | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>


Best regards,
Krzysztof