linux-kernel - [PATCH v9 14/14] arm64: dts: qcom: Add EL2 overlay for Lemans

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Message-Id: <20251217-kvm_rproc_v9-v9-14-ab7ac03e0ff1@oss.qualcomm.com>
Date: Wed, 17 Dec 2025 22:04:50 +0530
From: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mukesh Ojha <mukesh.ojha@....qualcomm.com>
Subject: [PATCH v9 14/14] arm64: dts: qcom: Add EL2 overlay for Lemans

All the Lemans IOT variants 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 a EL2-specific DT overlay and apply it to Lemans IOT variant
devices to create -el2.dtb for each of them alongside "normal" dtb.

[1]
https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi

Signed-off-by: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
---
 arch/arm64/boot/dts/qcom/Makefile        | 10 +++++++++
 arch/arm64/boot/dts/qcom/lemans-el2.dtso | 35 ++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index 6f34d5ed331c..56efd90b7a5e 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -37,6 +37,10 @@ lemans-evk-camera-dtbs	:= lemans-evk.dtb lemans-evk-camera.dtbo
 
 dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-camera-csi1-imx577.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-camera.dtb
+
+lemans-evk-el2-dtbs := lemans-evk.dtb lemans-el2.dtbo
+
+dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-el2.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8216-samsung-fortuna3g.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-acer-a1-724.dtb
@@ -142,6 +146,12 @@ dtb-$(CONFIG_ARCH_QCOM)	+= qcs8300-ride.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs8550-aim300-aiot.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride-r3.dtb
+
+qcs9100-ride-el2-dtbs := qcs9100-ride.dtb lemans-el2.dtbo
+qcs9100-ride-r3-el2-dtbs := qcs9100-ride-r3.dtb lemans-el2.dtbo
+
+dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride-el2.dtb
+dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride-r3-el2.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qdu1000-idp.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qrb2210-rb1.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qrb4210-rb2.dtb
diff --git a/arch/arm64/boot/dts/qcom/lemans-el2.dtso b/arch/arm64/boot/dts/qcom/lemans-el2.dtso
new file mode 100644
index 000000000000..ed615dce6c78
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/lemans-el2.dtso
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+
+/*
+ * Lemans specific modifications required to boot in EL2.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&iris {
+	status = "disabled";
+};
+
+&remoteproc_adsp {
+	iommus = <&apps_smmu 0x3000 0x0>;
+};
+
+&remoteproc_cdsp0 {
+	iommus = <&apps_smmu 0x21c0 0x0400>;
+};
+
+&remoteproc_cdsp1 {
+	iommus = <&apps_smmu 0x29c0 0x0400>;
+};
+
+&remoteproc_gpdsp0 {
+       iommus = <&apps_smmu 0x38a0 0x0>;
+};
+
+&remoteproc_gpdsp1 {
+       iommus = <&apps_smmu 0x38c0 0x0>;
+};

-- 
2.50.1