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

Krzysztof Kozlowski
2022-04-09T10:49:45Z

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@kernel.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
> ---
> .../bindings/interrupt-controller/arm,gic-v3.yaml | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>

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

Best regards,
Krzysztof