spi: dt-bindings: qcom,spi-qcom-qspi: Add qcom,qcs615-qspi compatible

Add support for the QSPI controller on QCS615 SoC.

Move allOf section after required properties and add if:then constraint
to require minimum 2 interconnects for qcs615 variant.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Viken Dadhaniya <viken.dadhaniya@oss.qualcomm.com>
Link: https://patch.msgid.link/20260429-spi-nor-v5-1-993016c9711e@oss.qualcomm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml

@@ -13,13 +13,11 @@ description: The QSPI controller allows SPI protocol communication in single,
   dual, or quad wire transmission modes for read/write access to slaves such
   as NOR flash.
 
-allOf:
-  - $ref: /schemas/spi/spi-controller.yaml#
-
 properties:
   compatible:
     items:
       - enum:
+          - qcom,qcs615-qspi
           - qcom,sc7180-qspi
           - qcom,sc7280-qspi
           - qcom,sdm845-qspi
@@ -67,6 +65,23 @@ required:
   - clock-names
   - clocks
 
+allOf:
+  - $ref: /schemas/spi/spi-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: qcom,qcs615-qspi
+    then:
+      properties:
+        interconnects:
+          minItems: 2
+        interconnect-names:
+          minItems: 2
+      required:
+        - interconnects
+        - interconnect-names
+
 unevaluatedProperties: false
 
 examples: