linux-kernel - Re: [PATCH v3] arm64: dts: qcom: hamoa: Add remoteproc IOMMUS in EL2 device trees

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Message-ID: <ebbcbb07-f268-4041-aac6-d81d6489201f@oss.qualcomm.com>
Date: Tue, 3 Feb 2026 09:49:43 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Xin Liu <xin.liu@....qualcomm.com>, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, tingwei.zhang@....qualcomm.com,
        jie.gan@....qualcomm.com, Abel Vesa <abel.vesa@....qualcomm.com>
Subject: Re: [PATCH v3] arm64: dts: qcom: hamoa: Add remoteproc IOMMUS in EL2
 device trees

On 2/3/26 7:32 AM, Xin Liu wrote:
> All the existing variants Hamoa boards are using Gunyah hypervisor
> which means that, so far, Linux-based OS could only boot in EL1 on
> those devices. However, it is possible for us to boot Linux at EL2
> on these devices [1].
> 
> When running under Gunyah, the remote processor firmware IOMMU streams
> are controlled by Gunyah. However, without Gunyah, the IOMMU is managed
> by the consumer of this DeviceTree. Therefore, describe the firmware
> streams for each remote processor.
> 
> Add remoteproc IOMMUS to the EL2 device trees to generate the
> corresponding -el2.dtb files.
> 
> [1]
> https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi
> 
> Reviewed-by: Abel Vesa <abel.vesa@....qualcomm.com>
> Signed-off-by: Xin Liu <xin.liu@....qualcomm.com>
> ---
> Changes in v3:
> - Modify the subject title

FWIW subject and title are the used interchangeably

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad