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

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Message-ID: <68702c64-7ee9-4571-9fce-0b2d23b3c03d@oss.qualcomm.com>
Date: Fri, 30 Jan 2026 10:24:20 +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
Subject: Re: [PATCH] arm64: dts: qcom: hamoa: Add remoteproc in EL2 device
 trees

On 1/30/26 8:31 AM, Xin Liu wrote:
> All the existing variants Talos 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 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
> 
> Signed-off-by: Xin Liu <xin.liu@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/x1-el2.dtso | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1-el2.dtso b/arch/arm64/boot/dts/qcom/x1-el2.dtso
> index 175679be01eb..8279854fd73c 100644
> --- a/arch/arm64/boot/dts/qcom/x1-el2.dtso
> +++ b/arch/arm64/boot/dts/qcom/x1-el2.dtso
> @@ -52,6 +52,14 @@ &pcie_smmu {
>  	status = "okay";
>  };
>  
> +&remoteproc_adsp {
> +	iommus = <&apps_smmu 0x1000 0x0>;

The mask should be 0x80 according to docs (although the resulting SID
is the same)

> +};
> +
> +&remoteproc_cdsp {
> +	iommus = <&apps_smmu 0x0c00 0x0>;

This looks in line with docs

Konrad