dt-bindings: iommu: dart: Add apple,t6020-dart compatible

t6020-dart is compatible to t8110-dart and annotated as such in Apple's
device tree. Add its per-SoC compatible in case t6020 specific handling
becomes necessary. The dart instances on M2 Pro/Max/Ultra based SoCs
differ in one aspect from the M2 based ones. They indicate an IAS of 42
requiring implementing support for a fouth page table level in the dart
driver and its io-pgtable [1].

[1]: https://lore.kernel.org/asahi/20250821-apple-dart-4levels-v2-0-e39af79daa37@jannau.net/

Reviewed-by: Neal Gompa <neal@gompa.dev>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Janne Grunau <j@jannau.net>

diff --git a/Documentation/devicetree/bindings/iommu/apple,dart.yaml b/Documentation/devicetree/bindings/iommu/apple,dart.yaml
index 7adb1de455a5b38dfb6c76303f11c8f95395e0dd..47ec7fa52c3ac6b3e111adf6998685f18f8602dd 100644 (file)
--- a/Documentation/devicetree/bindings/iommu/apple,dart.yaml
+++ b/Documentation/devicetree/bindings/iommu/apple,dart.yaml
@@ -22,11 +22,15 @@ description: |+
 
 properties:
   compatible:
-    enum:
-      - apple,t8103-dart
-      - apple,t8103-usb4-dart
-      - apple,t8110-dart
-      - apple,t6000-dart
+    oneOf:
+      - enum:
+          - apple,t8103-dart
+          - apple,t8103-usb4-dart
+          - apple,t8110-dart
+          - apple,t6000-dart
+      - items:
+          - const: apple,t6020-dart
+          - const: apple,t8110-dart
 
   reg:
     maxItems: 1