linux-kernel - [PATCH v3 1/3] dt-bindings: display: msm: qcm2290-mdss: Fix iommus property

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Message-ID: <20260122121042.579270-2-sumit.garg@kernel.org>
Date: Thu, 22 Jan 2026 17:40:40 +0530
From: Sumit Garg <sumit.garg@...nel.org>
To: linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: andersson@...nel.org,
	konradybcio@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	akhilpo@....qualcomm.com,
	vikash.garodia@....qualcomm.com,
	dikshita.agarwal@....qualcomm.com,
	robin.clark@....qualcomm.com,
	lumag@...nel.org,
	loic.poulain@....qualcomm.com,
	jorge.ramirez@....qualcomm.com,
	linux-kernel@...r.kernel.org,
	Sumit Garg <sumit.garg@....qualcomm.com>
Subject: [PATCH v3 1/3] dt-bindings: display: msm: qcm2290-mdss: Fix iommus property

From: Sumit Garg <sumit.garg@....qualcomm.com>

Fix IOMMU DT propety for display via dropping SMMU stream IDs which
relates to secure context bank. Assigning Linux kernel (HLOS) VMID
to secure context bank stream IDs is incorrect. The maximum value
for iommus property is updated accordingly.

These DT bindings changes should be backwards compatible.

Signed-off-by: Sumit Garg <sumit.garg@....qualcomm.com>
---
 .../devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml  | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml b/Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml
index f0cdb5422688..2772cdec7e42 100644
--- a/Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml
+++ b/Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml
@@ -33,7 +33,7 @@ properties:
       - const: core
 
   iommus:
-    maxItems: 2
+    maxItems: 1
 
   interconnects:
     items:
@@ -107,9 +107,7 @@ examples:
         interconnect-names = "mdp0-mem",
                              "cpu-cfg";
 
-        iommus = <&apps_smmu 0x420 0x2>,
-                 <&apps_smmu 0x421 0x0>;
-        ranges;
+        iommus = <&apps_smmu 0x420 0x2>;
 
         display-controller@...1000 {
             compatible = "qcom,qcm2290-dpu";
-- 
2.51.0