SQL Server SSRS: List out all Data Sources and all their dependency objects/Reports

 This Script will list all the data sources by their actual name, and all their dependent items:

SELECT C2.NAME AS Data_Source_Name
 ,C.NAME AS Dependent_Item_Name
 ,C.Path AS Dependent_Item_Path
FROM ReportServer.dbo.DataSource AS DS
INNER JOIN ReportServer.dbo.CATALOG AS C ON DS.ItemID = C.ItemID
 AND DS.Link IN (
  SELECT ItemID
  FROM ReportServer.dbo.CATALOG
  WHERE Type = 5
  ) --Type 5 identifies data sources
FULL JOIN ReportServer.dbo.CATALOG C2 ON DS.Link = C2.ItemID
WHERE C2.Type = 5
ORDER BY C2.NAME ASC
 ,C.NAME ASC;