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: <57c82928-5275-4f6c-b6d0-935dd5080f9b@linaro.org>
Date: Sun, 9 Feb 2025 15:45:18 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 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 07/02/2025 21:23, Konrad Dybcio wrote:
> 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

It's not what dtbs_check thinks !

> 
> Konrad