[PATCH v11 0/2] arm64: dts: qcom: kodiak: EL2 overlay for qcm6490-idp / qcs6490-rb3gen2

[PATCH v11 0/2] arm64: dts: qcom: kodiak: EL2 overlay for qcm6490-idp / qcs6490-rb3gen2

[Mukesh Ojha]

All existing Kodiak board variants run the Gunyah hypervisor, which
means Linux can only boot at EL1 on those devices. It is possible to
boot Linux at EL2 on the qcm6490-idp and qcs6490-rb3gen2 variants;
this series adds the DT overlay that describes the IOMMU streams and
other kernel-owned resources needed in that mode.

Patch 1 is a small independent cleanup of the two board .dts files:
keep the wlan_ce_mem reserved region (its /delete-node/ was erroneous)
and drop the redundant wifi memory-region override that duplicates
kodiak.dtsi. Patch 2 adds the kodiak-el2.dtso overlay and wires up
the -el2.dtb variants in the Makefile.

Changes in v11:
  - Had a conflict, rebased it on next-20260731
  - Link to v10-RESEND: https://lore.kernel.org/lkml/20260714071943.2036353-1-mukesh.ojha@oss.qualcomm.com/

Changes in v10-RESEND: https://lore.kernel.org/lkml/20260713160754.1250988-1-mukesh.ojha@oss.qualcomm.com/#t
  - Nothing, just  removed  In-Reply-To tag from each patches and
    cover-letter and added RESEND as part of the subject.

Changes in v10: https://lore.kernel.org/lkml/20260706161428.3764398-1-mukesh.ojha@oss.qualcomm.com/
 - Split the wlan_ce_mem retention and the redundant memory-region
   removal in qcm6490-idp.dts / qcs6490-rb3gen2.dts into its own patch. [Dmitry]
 - Drop status = "okay"; from &wifi in the overlay so platforms
   without wifi enabled in the base .dts are unaffected. [Dmitry]

Changes in v9: https://lore.kernel.org/lkml/20260624063952.2242702-1-mukesh.ojha@oss.qualcomm.com/
 - Instead of adding wlan_ce_mem back in the EL2 overlay, stop
   deleting it in qcm6490-idp.dts / qcs6490-rb3gen2.dts so it is
   present for both EL1 and EL2. [Miaoqing]

Changes in v8: https://lore.kernel.org/lkml/20260522115936.201208-2-sumit.garg@kernel.org/
 - Added a wpss copy engine memory similar to chrome for Wifi to work.
 - WPSS does not have firmware Stream, so that was removed.
 - Added wifi streams similar to chrome for wifi to work.
 - Removed this patch from Generic Pas patch series, can be followed
   separately.
 - Moved Sumit as co-author as part of modification done to the patch
   in the past.
 - Added some more kodiak's board variants in the makefile.

Changes in v1-v7:
 - mpss was disabled and will be enabled once the dependencies patches
   get merged.

Mukesh Ojha (2):
  arm64: dts: qcom: qcm6490-idp/qcs6490-rb3gen2: Keep wlan_ce_mem and
    drop redundant wifi memory-region
  arm64: dts: qcom: kodiak: Add EL2 overlay

 arch/arm64/boot/dts/qcom/Makefile            | 12 ++++++
 arch/arm64/boot/dts/qcom/kodiak-el2.dtso     | 39 ++++++++++++++++++++
 arch/arm64/boot/dts/qcom/qcm6490-idp.dts     |  2 -
 arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts |  2 -
 4 files changed, 51 insertions(+), 4 deletions(-)
 create mode 100644 arch/arm64/boot/dts/qcom/kodiak-el2.dtso

-- 
2.53.0

[PATCH v11 1/2] arm64: dts: qcom: qcm6490-idp/qcs6490-rb3gen2: Keep wlan_ce_mem and drop redundant wifi memory-region

[Mukesh Ojha]

The reserved region wlan_ce_mem is device memory used by the WCN6750
firmware. Deleting it in qcm6490-idp.dts and qcs6490-rb3gen2.dts is
erroneous — the region must remain present regardless of whether the
underlying OS uses it — so drop the /delete-node/ &wlan_ce_mem; from
both board files.

Also drop the per-board memory-region override from &wifi. Both
wlan_fw_mem and wlan_ce_mem are already assigned to the wifi node in
kodiak.dtsi, so the override is redundant.

Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/qcm6490-idp.dts     | 2 --
 arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 2 --
 2 files changed, 4 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/qcm6490-idp.dts b/arch/arm64/boot/dts/qcom/qcm6490-idp.dts
index bdc02260f902..6ab1bbdc0a62 100644
--- a/arch/arm64/boot/dts/qcom/qcm6490-idp.dts
+++ b/arch/arm64/boot/dts/qcom/qcm6490-idp.dts
@@ -25,7 +25,6 @@
 /delete-node/ &adsp_mem;
 /delete-node/ &cdsp_mem;
 /delete-node/ &video_mem;
-/delete-node/ &wlan_ce_mem;
 /delete-node/ &wpss_mem;
 /delete-node/ &xbl_mem;
 
@@ -1148,7 +1147,6 @@ &usb_1_qmpphy {
 };
 
 &wifi {
-	memory-region = <&wlan_fw_mem>;
 	qcom,calibration-variant = "Qualcomm_qcm6490idp";
 
 	status = "okay";
diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
index 90f2eebc349f..ba60fccbb63d 100644
--- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
+++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
@@ -26,7 +26,6 @@
 /delete-node/ &adsp_mem;
 /delete-node/ &cdsp_mem;
 /delete-node/ &video_mem;
-/delete-node/ &wlan_ce_mem;
 /delete-node/ &wpss_mem;
 /delete-node/ &xbl_mem;
 
@@ -1464,7 +1463,6 @@ &venus {
 };
 
 &wifi {
-	memory-region = <&wlan_fw_mem>;
 	qcom,calibration-variant = "Qualcomm_rb3gen2";
 
 	status = "okay";
-- 
2.53.0

[PATCH v11 2/2] arm64: dts: qcom: kodiak: Add EL2 overlay

[Mukesh Ojha]

All existing Kodiak board variants run the Gunyah hypervisor, which
means Linux can only boot at EL1 on those devices. It is possible to
boot Linux at EL2 on these devices [1].

When running under Gunyah, remote processor firmware IOMMU streams are
controlled by Gunyah. Without Gunyah, the IOMMU is managed by the
consumer of the DeviceTree. Describe the firmware streams for each
remote processor in an EL2 overlay.

Add an EL2-specific DT overlay and apply it to Kodiak IoT variant
devices to produce a -el2.dtb alongside the standard dtb. Modem and
media subsystems are not yet supported due to missing dependencies.
The GPU zap shader is disabled. In EL2 mode the kernel owns the
hardware watchdog, so it is enabled here. The wifi-firmware child
node describes the IOMMU stream for the WCN6750 firmware; the &wifi
node itself is left untouched so that platforms without WiFi are
unaffected by the overlay.

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

Co-developed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/Makefile        | 12 ++++++++
 arch/arm64/boot/dts/qcom/kodiak-el2.dtso | 39 ++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 arch/arm64/boot/dts/qcom/kodiak-el2.dtso

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index e05414290d8e..c62a68a57f96 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -165,7 +165,11 @@ purwa-iot-evk-el2-dtbs	:= purwa-iot-evk.dtb x1-el2.dtbo
 
 dtb-$(CONFIG_ARCH_QCOM)	+= purwa-iot-evk-el2.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcm6490-fairphone-fp5.dtb
+
 dtb-$(CONFIG_ARCH_QCOM)	+= qcm6490-idp.dtb
+qcm6490-idp-el2-dtbs := qcm6490-idp.dtb kodiak-el2.dtbo
+dtb-$(CONFIG_ARCH_QCOM)	+= qcm6490-idp-el2.dtb
+
 dtb-$(CONFIG_ARCH_QCOM)	+= qcm6490-particle-tachyon.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcm6490-shift-otter.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs404-evb-1000.dtb
@@ -177,12 +181,20 @@ qcs615-ride-el2-dtbs := qcs615-ride.dtb talos-el2.dtbo
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs615-ride-el2.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-radxa-dragon-q6a.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2.dtb
+qcs6490-rb3gen2-el2-dtbs := qcs6490-rb3gen2.dtb kodiak-el2.dtbo
+dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2-el2.dtb
 
 qcs6490-rb3gen2-vision-mezzanine-dtbs := qcs6490-rb3gen2.dtb qcs6490-rb3gen2-vision-mezzanine.dtbo
 qcs6490-rb3gen2-industrial-mezzanine-dtbs := qcs6490-rb3gen2.dtb qcs6490-rb3gen2-industrial-mezzanine.dtbo
 
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2-industrial-mezzanine.dtb
+qcs6490-rb3gen2-industrial-mezzanine-el2-dtbs := qcs6490-rb3gen2-industrial-mezzanine.dtb kodiak-el2.dtbo
+dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2-industrial-mezzanine-el2.dtb
+
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2-vision-mezzanine.dtb
+qcs6490-rb3gen2-vision-mezzanine-el2-dtbs := qcs6490-rb3gen2-vision-mezzanine.dtb kodiak-el2.dtbo
+dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-rb3gen2-vision-mezzanine-el2.dtb
+
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-thundercomm-minipc-g1iot.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-thundercomm-rubikpi3.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= qcs6490-vicharak-axon-mini.dtb
diff --git a/arch/arm64/boot/dts/qcom/kodiak-el2.dtso b/arch/arm64/boot/dts/qcom/kodiak-el2.dtso
new file mode 100644
index 000000000000..8daf7f02fd75
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/kodiak-el2.dtso
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ *
+ * Kodiak specific modifications required to boot in EL2.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&gpu_zap_shader {
+	status = "disabled";
+};
+
+&remoteproc_adsp {
+	iommus = <&apps_smmu 0x1800 0x0>;
+};
+
+&remoteproc_cdsp {
+	iommus = <&apps_smmu 0x11a0 0x0400>;
+};
+
+&remoteproc_mpss {
+	status = "disabled";
+};
+
+&venus {
+	status = "disabled";
+};
+
+&watchdog {
+	status = "okay";
+};
+
+&wifi {
+	wifi-firmware {
+		iommus = <&apps_smmu 0x1c02 0x1>;
+	};
+};
-- 
2.53.0

Re: [PATCH v11 1/2] arm64: dts: qcom: qcm6490-idp/qcs6490-rb3gen2: Keep wlan_ce_mem and drop redundant wifi memory-region

[Konrad Dybcio]

On 8/3/26 2:10 PM, Mukesh Ojha wrote:
> The reserved region wlan_ce_mem is device memory used by the WCN6750
> firmware. Deleting it in qcm6490-idp.dts and qcs6490-rb3gen2.dts is
> erroneous — the region must remain present regardless of whether the
> underlying OS uses it — so drop the /delete-node/ &wlan_ce_mem; from
> both board files.

But it starts below 0x8000_0000 where RAM starts, so it shouldn't really
matter, no?

Konrad

Re: [PATCH v11 1/2] arm64: dts: qcom: qcm6490-idp/qcs6490-rb3gen2: Keep wlan_ce_mem and drop redundant wifi memory-region

[Mukesh Ojha]

On Tue, Aug 25, 2026 at 11:32:49AM +0200, Konrad Dybcio wrote:
> On 8/3/26 2:10 PM, Mukesh Ojha wrote:
> > The reserved region wlan_ce_mem is device memory used by the WCN6750
> > firmware. Deleting it in qcm6490-idp.dts and qcs6490-rb3gen2.dts is
> > erroneous — the region must remain present regardless of whether the
> > underlying OS uses it — so drop the /delete-node/ &wlan_ce_mem; from
> > both board files.
> 
> But it starts below 0x8000_0000 where RAM starts, so it shouldn't really
> matter, no?

This region is used by the WLAN driver when Linux is at EL2, and similar to
Kodiak Chrome, Kodiak IOT also needs to use it.

-- 
-Mukesh Ojha

Re: [PATCH v11 1/2] arm64: dts: qcom: qcm6490-idp/qcs6490-rb3gen2: Keep wlan_ce_mem and drop redundant wifi memory-region

[Konrad Dybcio]

On 9/20/26 9:54 AM, Mukesh Ojha wrote:
> On Tue, Aug 25, 2026 at 11:32:49AM +0200, Konrad Dybcio wrote:
>> On 8/3/26 2:10 PM, Mukesh Ojha wrote:
>>> The reserved region wlan_ce_mem is device memory used by the WCN6750
>>> firmware. Deleting it in qcm6490-idp.dts and qcs6490-rb3gen2.dts is
>>> erroneous — the region must remain present regardless of whether the
>>> underlying OS uses it — so drop the /delete-node/ &wlan_ce_mem; from
>>> both board files.
>>
>> But it starts below 0x8000_0000 where RAM starts, so it shouldn't really
>> matter, no?
> 
> This region is used by the WLAN driver when Linux is at EL2, and similar to
> Kodiak Chrome, Kodiak IOT also needs to use it.

Right, it's a sneaky iommu_map

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

Re: [PATCH v11 0/2] arm64: dts: qcom: kodiak: EL2 overlay for qcm6490-idp / qcs6490-rb3gen2

[Abel Vesa]

On Mon, 03 Aug 2026 17:40:40 +0530, Mukesh Ojha <mukesh.ojha@oss.qualcomm.com> wrote:
> arm64: dts: qcom: kodiak: EL2 overlay for qcm6490-idp / qcs6490-rb3gen2
> 
> All existing Kodiak board variants run the Gunyah hypervisor, which
> means Linux can only boot at EL1 on those devices. It is possible to
> boot Linux at EL2 on the qcm6490-idp and qcs6490-rb3gen2 variants;
> this series adds the DT overlay that describes the IOMMU streams and
> other kernel-owned resources needed in that mode.
> 
> [...]

Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>

-- 
Abel Vesa <abel.vesa@oss.qualcomm.com>