dt-bindings: display/msm: expand to support MST

On a vast majority of Qualcomm chipsets DisplayPort controller can
support several MST streams (up to 4x). To support MST these chipsets
use up to 4 stream pixel clocks for the DisplayPort controller and
several extra register regions. Expand corresponding region and clock
bindings for these platforms and fix example schema files to follow
updated bindings.

Note: On chipsets that support MST, the number of streams supported
can vary between controllers. For example, SA8775P supports 4 MST
streams on mdss_dp0 but only 2 streams on mdss_dp1.

Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Jessica Zhang <jessica.zhang@oss.qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Patchwork: https://patchwork.freedesktop.org/patch/672585/
Link: https://lore.kernel.org/r/20250903-dp_mst_bindings-v8-7-7526f0311eaa@oss.qualcomm.com

Documentation/devicetree/bindings/display/msm/dp-controller.yaml

@@ -66,25 +66,37 @@ properties:
       - description: link register block
       - description: p0 register block
       - description: p1 register block
+      - description: p2 register block
+      - description: p3 register block
+      - description: mst2link register block
+      - description: mst3link register block
 
   interrupts:
     maxItems: 1
 
   clocks:
+    minItems: 5
     items:
       - description: AHB clock to enable register access
       - description: Display Port AUX clock
       - description: Display Port Link clock
       - description: Link interface clock between DP and PHY
-      - description: Display Port Pixel clock
+      - description: Display Port stream 0 Pixel clock
+      - description: Display Port stream 1 Pixel clock
+      - description: Display Port stream 2 Pixel clock
+      - description: Display Port stream 3 Pixel clock
 
   clock-names:
+    minItems: 5
     items:
       - const: core_iface
       - const: core_aux
       - const: ctrl_link
       - const: ctrl_link_iface
       - const: stream_pixel
+      - const: stream_1_pixel
+      - const: stream_2_pixel
+      - const: stream_3_pixel
 
   phys:
     maxItems: 1
@@ -166,7 +178,6 @@ required:
 allOf:
   # AUX BUS does not exist on DP controllers
   # Audio output also is present only on DP output
-  # p1 regions is present on DP, but not on eDP
   - if:
       properties:
         compatible:
@@ -195,11 +206,95 @@ allOf:
       else:
         properties:
           aux-bus: false
-          reg:
-            minItems: 5
         required:
           - "#sound-dai-cells"
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              # these platforms support SST only
+              - qcom,sc7180-dp
+              - qcom,sc7280-dp
+              - qcom,sc7280-edp
+              - qcom,sc8180x-edp
+              - qcom,sc8280xp-edp
+    then:
+      properties:
+        reg:
+          minItems: 5
+          maxItems: 5
+        clocks:
+          minItems: 5
+          maxItems: 5
+        clocks-names:
+          minItems: 5
+          maxItems: 5
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              # these platforms support 2 streams MST on some interfaces,
+              # others are SST only
+              - qcom,sc8280xp-dp
+              - qcom,x1e80100-dp
+    then:
+      properties:
+        reg:
+          minItems: 5
+          maxItems: 5
+        clocks:
+          minItems: 5
+          maxItems: 6
+        clocks-names:
+          minItems: 5
+          maxItems: 6
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            # 2 streams MST
+            enum:
+              - qcom,sc8180x-dp
+              - qcom,sdm845-dp
+              - qcom,sm8350-dp
+              - qcom,sm8650-dp
+    then:
+      properties:
+        reg:
+          minItems: 5
+          maxItems: 5
+        clocks:
+          minItems: 6
+          maxItems: 6
+        clocks-names:
+          minItems: 6
+          maxItems: 6
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              # these platforms support 4 stream MST on first DP,
+              # 2 streams MST on the second one.
+              - qcom,sa8775p-dp
+    then:
+      properties:
+        reg:
+          minItems: 9
+          maxItems: 9
+        clocks:
+          minItems: 6
+          maxItems: 8
+        clocks-names:
+          minItems: 6
+          maxItems: 8
+
 additionalProperties: false
 
 examples: