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arm64: dts: qcom: talos: Add EL2 overlay

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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 a EL2-specific DT overlay and apply it to Talos 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

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260127-talos-el2-overlay-v2-3-b6a2266532c4@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Mukesh Ojha 2026-01-27 17:13:50 +05:30 committed by Bjorn Andersson
parent 0f9e6db8a2
commit 1bb533d644
2 changed files with 29 additions and 0 deletions
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4
arch/arm64/boot/dts/qcom/Makefile
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@ -163,6 +163,10 @@ dtb-$(CONFIG_ARCH_QCOM) += qcm6490-shift-otter.dtb
dtb-$(CONFIG_ARCH_QCOM) += qcs404-evb-1000.dtb
dtb-$(CONFIG_ARCH_QCOM) += qcs404-evb-4000.dtb
dtb-$(CONFIG_ARCH_QCOM) += qcs615-ride.dtb
qcs615-ride-el2-dtbs := qcs615-ride.dtb talos-el2.dtbo
dtb-$(CONFIG_ARCH_QCOM) += qcs615-ride-el2.dtb
dtb-$(CONFIG_ARCH_QCOM) += qcs6490-radxa-dragon-q6a.dtb
dtb-$(CONFIG_ARCH_QCOM) += qcs6490-rb3gen2.dtb

25
arch/arm64/boot/dts/qcom/talos-el2.dtso Normal file
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@ -0,0 +1,25 @@
// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
* Talos specific modifications required to boot in EL2.
*/
/dts-v1/;
/plugin/;
&gpu_zap_shader {
status = "disabled";
};
&remoteproc_adsp {
iommus = <&apps_smmu 0x1720 0x0>;
};
&remoteproc_cdsp {
iommus = <&apps_smmu 0x1080 0x0>;
};
&venus {
status = "disabled";
};