FROMLIST: arm64: dts: qcom: monaco: Add EL2 overlay

All the Monaco 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 Monaco 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

Link: https://lore.kernel.org/lkml/20260127-talos-el2-overlay-v2-2-b6a2266532c4@oss.qualcomm.com/
Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>

Author: mukeshojha-linux

arch/arm64/boot/dts/qcom/Makefile

@@ -46,6 +46,10 @@ dtb-$(CONFIG_ARCH_QCOM)	+= lemans-evk-camx.dtb
 
 dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk.dtb
 
+monaco-evk-el2-dtbs := monaco-evk.dtb monaco-el2.dtbo
+
+dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk-el2.dtb
+
 monaco-evk-camera-imx577-dtbs	:= monaco-evk.dtb monaco-evk-camera-imx577.dtbo
 dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk-camera-imx577.dtb
 monaco-evk-camx-dtbs   := monaco-evk.dtb monaco-evk-camx.dtbo
@@ -157,6 +161,10 @@ dtb-$(CONFIG_ARCH_QCOM) += qcs6490-rb3gen2-vision-mezzanine-camx.dtb
 
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs8300-ride.dtb
 
+qcs8300-ride-el2-dtbs := qcs8300-ride.dtb monaco-el2.dtbo
+
+dtb-$(CONFIG_ARCH_QCOM)	+= qcs8300-ride-el2.dtb
+
 qcs8300-ride-camx-dtbs:= qcs8300-ride.dtb qcs8300-ride-camx.dtbo
 
 dtb-$(CONFIG_ARCH_QCOM) += qcs8300-ride-camx.dtb

arch/arm64/boot/dts/qcom/monaco-el2.dtso

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ *
+ * Monaco specific modifications required to boot in EL2.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&gpu_zap_shader {
+	status = "disabled";
+};
+
+&iris {
+	status = "disabled";
+};
+
+&remoteproc_adsp {
+	iommus = <&apps_smmu 0x2000 0x0>;
+};
+
+&remoteproc_cdsp {
+	iommus = <&apps_smmu 0x19c0 0x0400>;
+};
+
+&remoteproc_gpdsp {
+	iommus = <&apps_smmu 0x28a0 0x0>;
+};