dt-bindings: mtd: partitions: Extend fixed-partitions binding

Extend fixed-partitions binding for support of Sercomm partition parser
(add "sercomm,sc-partitions" compatible).
Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220516151725.885427-1-csharper2005@gmail.com

Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml

@@ -19,7 +19,11 @@ maintainers:
 
 properties:
   compatible:
-    const: fixed-partitions
+    oneOf:
+      - const: fixed-partitions
+      - items:
+          - const: sercomm,sc-partitions
+          - const: fixed-partitions
 
   "#address-cells": true
 
@@ -27,7 +31,24 @@ properties:
 
 patternProperties:
   "@[0-9a-f]+$":
-    $ref: "partition.yaml#"
+    allOf:
+      - $ref: "partition.yaml#"
+      - if:
+          properties:
+            compatible:
+              contains:
+                const: sercomm,sc-partitions
+        then:
+          properties:
+            sercomm,scpart-id:
+              description: Partition id in Sercomm partition map. Mtd
+                parser uses this id to find a record in the partition map
+                containing offset and size of the current partition. The
+                values from partition map overrides partition offset and
+                size defined in reg property of the dts. Frequently these
+                values are the same, but may differ if device has bad
+                eraseblocks on a flash.
+              $ref: /schemas/types.yaml#/definitions/uint32
 
 required:
   - "#address-cells"
@@ -52,6 +73,7 @@ examples:
             reg = <0x0100000 0x200000>;
         };
     };
+
   - |
     partitions {
         compatible = "fixed-partitions";
@@ -64,6 +86,7 @@ examples:
             reg = <0x00000000 0x1 0x00000000>;
         };
     };
+
   - |
     partitions {
         compatible = "fixed-partitions";
@@ -82,6 +105,7 @@ examples:
             reg = <0x2 0x00000000 0x1 0x00000000>;
         };
     };
+
   - |
     partitions {
         compatible = "fixed-partitions";
@@ -119,3 +143,30 @@ examples:
             };
         };
     };
+
+  - |
+    partitions {
+        compatible = "sercomm,sc-partitions", "fixed-partitions";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        partition@0 {
+            label = "u-boot";
+            reg = <0x0 0x100000>;
+            sercomm,scpart-id = <0>;
+            read-only;
+        };
+
+        partition@100000 {
+            label = "dynamic partition map";
+            reg = <0x100000 0x100000>;
+            sercomm,scpart-id = <1>;
+        };
+
+        partition@200000 {
+            label = "Factory";
+            reg = <0x200000 0x100000>;
+            sercomm,scpart-id = <2>;
+            read-only;
+        };
+    };