[PATCH RFC 16/16] dt-bindings: mfd: Document smp-memram node for AST2600 SCU

[Andrew Jeffery <andrew@codeconstruct.com.au>]

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@codeconstruct.com.au>
---
 .../devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml    | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml b/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml
index da1887d7a8fe..3406b98c4d0b 100644
--- a/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml
+++ b/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml
@@ -130,6 +130,24 @@ 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

-- 
2.47.3