Create the map with:
TopTools_IndexedDataMapOfShapeListOfShape myEdgeFaceMap;
TopExp::MapShapesAndAncestors(myShape, TopAbs_EDGE, TopAbs_FACE, myEdgeFaceMap);
Reference it with:
const TopTools_ListOfShape &myFaces = mapEdgeFace.FindFromKey(myEdge);
TopTools_ListIteratorOfListOfShape itFace;
for (itFace.Initialize(myFaces); itFace.More(); itFace.Next()) {
// process the face
}