dt-bindings: cache: qcom,llcc: Document Hawi SoC

Add documentation for the Last Level Cache Controller (LLCC) bindings
to support Hawi SoC where the System Cache Table (SCT) is programmed
by firmware outside of Linux.

Introduce a property that specifies the base address of the shared
memory region from which the driver should read SCT descriptors
provided by firmware.

Signed-off-by: Francisco Munoz Ruiz <francisco.ruiz@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260407-external_llcc_changes2set-v2-1-b5017ce2020b@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Documentation/devicetree/bindings/cache/qcom,llcc.yaml

@@ -21,6 +21,7 @@ properties:
   compatible:
     enum:
       - qcom,glymur-llcc
+      - qcom,hawi-llcc
       - qcom,ipq5424-llcc
       - qcom,kaanapali-llcc
       - qcom,qcs615-llcc
@@ -58,6 +59,11 @@ properties:
   interrupts:
     maxItems: 1
 
+  memory-region:
+    maxItems: 1
+    description: handle to a reserved-memory node used for firmware-populated
+      SLC/SCT shared memory.
+
   nvmem-cells:
     items:
       - description: Reference to an nvmem node for multi channel DDR
@@ -320,6 +326,7 @@ allOf:
           contains:
             enum:
               - qcom,kaanapali-llcc
+              - qcom,hawi-llcc
               - qcom,sm8450-llcc
               - qcom,sm8550-llcc
               - qcom,sm8650-llcc
@@ -342,6 +349,18 @@ allOf:
             - const: llcc3_base
             - const: llcc_broadcast_base
             - const: llcc_broadcast_and_base
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,hawi-llcc
+    then:
+      required:
+        - memory-region
+    else:
+      properties:
+        memory-region: false
 
 additionalProperties: false