dt-bindings: mtd: partitions: add additional example for qcom,smem-part

Add additional example for qcom,smem-part to declare a dynamic
partition to provide NVMEM cells for the commonly ART partition
provided by this parser.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220622010628.30414-3-ansuelsmth@gmail.com

Documentation/devicetree/bindings/mtd/partitions/qcom,smem-part.yaml

@@ -19,6 +19,10 @@ properties:
   compatible:
     const: qcom,smem-part
 
+patternProperties:
+  "^partition-[0-9a-z]+$":
+    $ref: partition.yaml#
+
 required:
   - compatible
 
@@ -31,3 +35,26 @@ examples:
             compatible = "qcom,smem-part";
         };
     };
+
+  - |
+    /* Example declaring dynamic partition */
+    flash {
+      partitions {
+        compatible = "qcom,smem-part";
+
+        partition-art {
+          compatible = "nvmem-cells";
+          #address-cells = <1>;
+          #size-cells = <1>;
+          label = "0:art";
+
+          macaddr_art_0: macaddr@0 {
+            reg = <0x0 0x6>;
+          };
+
+          macaddr_art_6: macaddr@6 {
+            reg = <0x6 0x6>;
+          };
+        };
+      };
+    };