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

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Message-ID: <20260203063244.1498699-1-xin.liu@oss.qualcomm.com>
Date: Mon,  2 Feb 2026 22:32:44 -0800
From: Xin Liu <xin.liu@....qualcomm.com>
To: 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: [PATCH v3] arm64: dts: qcom: hamoa: Add remoteproc IOMMUS in EL2 device trees

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
- Link to v2 : https://lore.kernel.org/all/20260202055436.818098-1-xin.liu@oss.qualcomm.com/

Changes in v2:
- Fix the adsp iommus mask
- Link to v1 : https://lore.kernel.org/all/20260130073113.3091884-1-xin.liu@oss.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..ee006742d6f3 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 0x80>;
+};
+
+&remoteproc_cdsp {
+	iommus = <&apps_smmu 0x0c00 0x0>;
+};
+
 /*
  * The "SBSA watchdog" is implemented in software in Gunyah
  * and can't be used when running in EL2.
-- 
2.43.0