dtb: Handle multiple types differing in sign

If a property has multiple types differing in sign, drop the unsigned
type. This prevents us from falling back to a 'uint32-array' which is
now decoded differently.

Same thing could happen for arrays or matrices, but ignore those for
now.

Signed-off-by: Rob Herring (Arm) <[email protected]>

Author: robherring

dtschema/dtb.py

@@ -115,6 +115,16 @@ def prop_value(validator, nodename, p):
         if prop_types >= {'phandle', 'phandle-array'}:
             prop_types -= {'phandle'}
 
+        # Drop the unsigned type if both signed and unsigned type exists
+        if prop_types >= {'int64', 'uint64'}:
+            prop_types -= {'uint64'}
+        if prop_types >= {'int32', 'uint32'}:
+            prop_types -= {'uint32'}
+        if prop_types >= {'int16', 'uint16'}:
+            prop_types -= {'uint16'}
+        if prop_types >= {'int8', 'uint8'}:
+            prop_types -= {'uint8'}
+
     if len(prop_types) > 1:
         if {'string', 'string-array'} & prop_types:
             str = bytes_to_string(data)