[PATCH v3 12/12] arm64: dts: qcom: Add EL2 overlay for Lemans

Mukesh Ojha
2025-09-20T19:42:32Z

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, remote processor firmware IOMMU streams is
controlled by the Gunyah however when Linux take ownership of it in EL2,
It need to configure it properly to use 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@oss.qualcomm.com>
---
arch/arm64/boot/dts/qcom/Makefile | 7 ++++++-
arch/arm64/boot/dts/qcom/lemans-el2.dtso | 28 ++++++++++++++++++++++++++++
2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index 296688f7cb26..e2eb6c4f8e25 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -35,6 +35,8 @@ dtb-$(CONFIG_ARCH_QCOM) += lemans-evk.dtb
lemans-evk-camera-csi1-imx577-dtbs := lemans-evk.dtb lemans-evk-camera-csi1-imx577.dtbo

dtb-$(CONFIG_ARCH_QCOM) += lemans-evk-camera-csi1-imx577.dtb
+lemans-evk-el2-dtbs := lemans-evk.dtb lemans-el2.dtbo
+dtb-$(CONFIG_ARCH_QCOM) += lemans-evk-el2.dtb
dtb-$(CONFIG_ARCH_QCOM) += monaco-evk.dtb
dtb-$(CONFIG_ARCH_QCOM) += msm8216-samsung-fortuna3g.dtb
dtb-$(CONFIG_ARCH_QCOM) += msm8916-acer-a1-724.dtb
@@ -136,7 +138,10 @@ dtb-$(CONFIG_ARCH_QCOM) += qcs6490-rb3gen2-vision-mezzanine.dtb
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
+dtb-$(CONFIG_ARCH_QCOM) += qcs9100-ride.dtb qcs9100-ride-el2.dtb
+qcs9100-ride-r3-el2-dtbs := qcs9100-ride-r3.dtb lemans-el2.dtbo
+dtb-$(CONFIG_ARCH_QCOM) += qcs9100-ride-r3.dtb 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..55a2a9e2b10d
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/lemans-el2.dtso
@@ -0,0 +1,28 @@
+// 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/;
+
+/*
+ * When running under Gunyah, remote processor firmware IOMMU streams is
+ * controlled by the Gunyah however when we take ownership of it in EL2,
+ * we need to configure it properly to use remote processor.
+ */
+&remoteproc_adsp {
+ iommus = <&apps_smmu 0x3000 0x0>;
+};
+
+&remoteproc_cdsp0 {
+ iommus = <&apps_smmu 0x21c0 0x0400>;
+};
+
+&remoteproc_cdsp1 {
+ iommus = <&apps_smmu 0x29c0 0x0400>;
+};

--
2.50.1