schemas: memory: Add ECC properties

Some memories provide ECC detection and/or correction. For software which
wants to check memory, it is helpful to see which regions provide this
feature.

Add this as a property of the /memory nodes, since it presumably follows
the hardware-level memory system.

Signed-off-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/20230926194242.2732127-1-sjg@chromium.org
Signed-off-by: Rob Herring <robh@kernel.org>

dtschema/schemas/memory.yaml

@@ -35,6 +35,19 @@ patternProperties:
           For the purpose of identification, each NUMA node is associated with
           a unique token known as a node id.
 
+      ecc-detection-bits:
+        default: 0
+        description: |
+          If present, this indicates the number of bits of memory error which
+          can be detected and reported by the Error-Correction Code (ECC) memory
+          subsystem (typically 0, 1 or 2).
+
+      ecc-correction-bits:
+        default: 0
+        description: |
+          If present, this indicates the number of bits of memory error which
+          can be corrected by the Error-Correction Code (ECC) memory subsystem
+          (typically 0, 1 or 2).
 
     required:
       - device_type