Allow ARM CCI-400 slave interface nodes to use a syscon fallback
compatible. The MT7622 DTS uses the fallback on cci_control2 while
keeping arm,cci-400-ctrl-if as the primary compatible.

Assisted-by: LLM
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
---
 Documentation/devicetree/bindings/arm/arm,cci-400.yaml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/arm,cci-400.yaml b/Documentation/devicetree/bindings/arm/arm,cci-400.yaml
index d28303d909e1..a4f086c2f9c4 100644
--- a/Documentation/devicetree/bindings/arm/arm,cci-400.yaml
+++ b/Documentation/devicetree/bindings/arm/arm,cci-400.yaml
@@ -45,7 +45,11 @@ patternProperties:
 
     properties:
       compatible:
-        const: arm,cci-400-ctrl-if
+        oneOf:
+          - const: arm,cci-400-ctrl-if
+          - items:
+              - const: arm,cci-400-ctrl-if
+              - const: syscon
 
       interface-type:
         enum:
-- 
2.53.0