[PATCH] dt-bindings: mfd: Document smp-memram subnode for aspeed,ast2x00-scu

[Andrew Jeffery]

The platform initialisation code for the AST2600 implements the custom
SMP bringup protocol, and searches for the relevant compatible. As a
consequence, define the requisite node and the compatible string, which
in-turn tidies up the dtb check results.

Signed-off-by: Andrew Jeffery <andrew@xxxxxxxxxxxxxxxxxxxx>
---
Hello,

This change was original part of an RFC series tidying up the AST2600
EVB devicetree at [1]. Many of those ended up being merged directly, so
I'm splitting out what remains into separate, smaller series.

Please review.

Changes since RFC:
- Address the warning from Rob's bot
- Tidy a description line that was dropped unnecessarily
- Remove RFC label

Link: https://lore.kernel.org/all/20251211-dev-dt-warnings-all-v1-16-21b18b9ada77@xxxxxxxxxxxxxxxxxxxx/ [1]
---
 .../devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml     | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml b/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml
index da1887d7a8fe..a87f31fce019 100644
--- a/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml
+++ b/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml
@@ -130,6 +130,23 @@ patternProperties:
           - description: silicon id information registers
           - description: unique chip id registers
 
+  '^smp-memram@[0-9a-f]+$':
+    description: Memory region used for the AST2600's custom SMP bringup protocol
+    type: object
+    additionalProperties: false
+
+    properties:
+      compatible:
+        const: aspeed,ast2600-smpmem
+
+      reg:
+        description: The SMP memory region
+        maxItems: 1
+
+    required:
+      - compatible
+      - reg
+
 required:
   - compatible
   - reg

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20260109-dev-dt-warnings-mfd-b57e0e9fdcf8

Best regards,
-- 
Andrew Jeffery <andrew@xxxxxxxxxxxxxxxxxxxx>