linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: sm8650: switch to interrupt-cells 4 to add PPI partitions

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Message-ID: <efcc2cee-1d8b-45d1-aa9a-4e7afc19d857@oss.qualcomm.com>
Date: Fri, 7 Feb 2025 21:23:54 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: sm8650: switch to interrupt-cells 4
 to add PPI partitions

On 7.02.2025 11:31 AM, Neil Armstrong wrote:
> The ARM PMUs shares the same per-cpu (PPI) interrupt, so we need to switch
> to interrupt-cells = <4> in the GIC node to allow adding an interrupt
> partition map phandle as the 4th cell value for GIC_PPI interrupts.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---

If I'm reading the core right, we can leave the fourth cell
uninitialized where it makes no sense

Konrad