dt-bindings: display: msm: qcm2290: Add Shikra MDSS

Shikra reuses the same MDSS/DPU 6.5 hardware as QCM2290. Extend
the existing qcm2290 bindings to cover Shikra by adding fallback
compatible chains for MDSS, DPU and DSI controller nodes rather
than introducing a separate binding file.

Signed-off-by: Nabige Aala <nabige.aala@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/731152/
Link: https://lore.kernel.org/r/20260608-shikra-display-v4-1-88a846afdd5d@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

Documentation/devicetree/bindings/display/msm/dsi-controller-main.yaml

@@ -47,6 +47,10 @@ properties:
               - qcom,sm8650-dsi-ctrl
               - qcom,sm8750-dsi-ctrl
           - const: qcom,mdss-dsi-ctrl
+      - items:
+          - const: qcom,shikra-dsi-ctrl
+          - const: qcom,qcm2290-dsi-ctrl
+          - const: qcom,mdss-dsi-ctrl
       - items:
           - enum:
               - qcom,qcs8300-dsi-ctrl

Documentation/devicetree/bindings/display/msm/qcom,qcm2290-dpu.yaml

@@ -13,7 +13,11 @@ $ref: /schemas/display/msm/dpu-common.yaml#
 
 properties:
   compatible:
-    const: qcom,qcm2290-dpu
+    oneOf:
+      - const: qcom,qcm2290-dpu
+      - items:
+          - const: qcom,shikra-dpu
+          - const: qcom,qcm2290-dpu
 
   reg:
     items:

Documentation/devicetree/bindings/display/msm/qcom,qcm2290-mdss.yaml

@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/display/msm/qcom,qcm2290-mdss.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Qualcomm QCM220 Display MDSS
+title: Qualcomm QCM2290 and Shikra Display MDSS
 
 maintainers:
   - Loic Poulain <loic.poulain@linaro.org>
@@ -12,13 +12,18 @@ maintainers:
 description:
   Device tree bindings for MSM Mobile Display Subsystem(MDSS) that encapsulates
   sub-blocks like DPU display controller and DSI. Device tree bindings of MDSS
-  are mentioned for QCM2290 target.
+  are mentioned for QCM2290 and Shikra targets. Shikra uses the same MDSS/DPU/DSI
+  hardware as QCM2290 (DPU 6.5) and shares the same register layout.
 
 $ref: /schemas/display/msm/mdss-common.yaml#
 
 properties:
   compatible:
-    const: qcom,qcm2290-mdss
+    oneOf:
+      - const: qcom,qcm2290-mdss
+      - items:
+          - const: qcom,shikra-mdss
+          - const: qcom,qcm2290-mdss
 
   clocks:
     items:
@@ -52,7 +57,8 @@ patternProperties:
 
     properties:
       compatible:
-        const: qcom,qcm2290-dpu
+        contains:
+          const: qcom,qcm2290-dpu
 
   "^dsi@[0-9a-f]+$":
     type: object
@@ -60,9 +66,8 @@ patternProperties:
 
     properties:
       compatible:
-        items:
-          - const: qcom,qcm2290-dsi-ctrl
-          - const: qcom,mdss-dsi-ctrl
+        contains:
+          const: qcom,qcm2290-dsi-ctrl
 
   "^phy@[0-9a-f]+$":
     type: object