[PATCH 1/6] dt-bindings: misc: fastrpc: Add memory-region property for context bank

[Vinayak Katoch]

Add an optional memory-region property to the context bank node schema.
The driver uses its presence to identify a context bank as dedicated for
extended IOVA mapping and programs the SMMU with an iommu-addresses
range to push allocations into the wider address space.

Relax #address-cells to enum: [1, 2] and #size-cells to enum: [0, 2] to
allow platforms that require 64-bit values in iommu-addresses to pass
binding validation.

Signed-off-by: Vinayak Katoch <vinayak.katoch@xxxxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
index e945c8ba75e3..f9830ef37814 100644
--- a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
+++ b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
@@ -73,10 +73,10 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32-array
 
   "#address-cells":
-    const: 1
+    enum: [1, 2]
 
   "#size-cells":
-    const: 0
+    enum: [0, 2]
 
 patternProperties:
   "(compute-)?cb@[0-9]*$":
@@ -98,6 +98,14 @@ patternProperties:
         minItems: 1
         maxItems: 10
 
+      memory-region:
+        maxItems: 1
+        description:
+          Phandle to a reserved-memory node whose iommu-addresses property
+          blocks the lower IOVA range, forcing allocations into the extended
+          address space. Its presence marks this context bank as an extended
+          mapping bank.
+
       qcom,nsessions:
         $ref: /schemas/types.yaml#/definitions/uint32
         default: 1

-- 
2.34.1