linux-kernel - [PATCH RFC 09/16] dt-bindings: bus: aspeed: Require syscon for AST2600 AHB controller

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Message-Id: <20251211-dev-dt-warnings-all-v1-9-21b18b9ada77@codeconstruct.com.au>
Date: Thu, 11 Dec 2025 17:45:51 +0900
From: Andrew Jeffery <andrew@...econstruct.com.au>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Linus Walleij <linusw@...nel.org>
Cc: Joel Stanley <joel@....id.au>, linux-hwmon@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 openbmc@...ts.ozlabs.org, linux-gpio@...r.kernel.org, 
 linux-mmc@...r.kernel.org, linux-crypto@...r.kernel.org, 
 linux-iio@...r.kernel.org, Andrew Jeffery <andrew@...econstruct.com.au>
Subject: [PATCH RFC 09/16] dt-bindings: bus: aspeed: Require syscon for
 AST2600 AHB controller

The AST2600's ACRY (eliptic curve and RSA crypto engine) requires access
to configuration exposed by the AHB controller. The devicetree already
describes the AHB controller node as a syscon, so require this in the
binding to satisfy the ACRY relationship.

Signed-off-by: Andrew Jeffery <andrew@...econstruct.com.au>
---
 Documentation/devicetree/bindings/bus/aspeed,ast2600-ahbc.yaml | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/bus/aspeed,ast2600-ahbc.yaml b/Documentation/devicetree/bindings/bus/aspeed,ast2600-ahbc.yaml
index 2894256c976d..77e60b32d52e 100644
--- a/Documentation/devicetree/bindings/bus/aspeed,ast2600-ahbc.yaml
+++ b/Documentation/devicetree/bindings/bus/aspeed,ast2600-ahbc.yaml
@@ -17,8 +17,10 @@ description: |
 
 properties:
   compatible:
-    enum:
-      - aspeed,ast2600-ahbc
+    items:
+      - enum:
+          - aspeed,ast2600-ahbc
+      - const: syscon
 
   reg:
     maxItems: 1
@@ -32,6 +34,6 @@ additionalProperties: false
 examples:
   - |
     ahbc@...00000 {
-        compatible = "aspeed,ast2600-ahbc";
+        compatible = "aspeed,ast2600-ahbc", "syscon";
         reg = <0x1e600000 0x100>;
     };

-- 
2.47.3