diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst
index 491daf43af..612b34b02c 100644
--- a/docs/system/deprecated.rst
+++ b/docs/system/deprecated.rst
@@ -153,6 +153,15 @@ the process listing. This is replaced by the new ``password-secret``
 option which lets the password be securely provided on the command
 line using a ``secret`` object instance.
 
+``opened`` property of ``rng-*`` objects (since 6.0.0)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+The only effect of specifying ``opened=on`` in the command line or QMP
+``object-add`` is that the device is opened immediately, possibly before all
+other options have been processed.  This will either have no effect (if
+``opened`` was the last option) or cause errors.  The property is therefore
+useless and should not be specified.
+
 QEMU Machine Protocol (QMP) commands
 ------------------------------------
 
diff --git a/qapi/qom.json b/qapi/qom.json
index 79525f64a1..7fb243c3ab 100644
--- a/qapi/qom.json
+++ b/qapi/qom.json
@@ -382,6 +382,52 @@
             '*hugetlbsize': 'size',
             '*seal': 'bool' } }
 
+##
+# @RngProperties:
+#
+# Properties for objects of classes derived from rng.
+#
+# @opened: if true, the device is opened immediately when applying this option
+#          and will probably fail when processing the next option. Don't use;
+#          only provided for compatibility. (default: false)
+#
+# Features:
+# @deprecated: Member @opened is deprecated.  Setting true doesn't make sense,
+#              and false is already the default.
+#
+# Since: 1.3
+##
+{ 'struct': 'RngProperties',
+  'data': { '*opened': { 'type': 'bool', 'features': ['deprecated'] } } }
+
+##
+# @RngEgdProperties:
+#
+# Properties for rng-egd objects.
+#
+# @chardev: the name of a character device backend that provides the connection
+#           to the RNG daemon
+#
+# Since: 1.3
+##
+{ 'struct': 'RngEgdProperties',
+  'base': 'RngProperties',
+  'data': { 'chardev': 'str' } }
+
+##
+# @RngRandomProperties:
+#
+# Properties for rng-random objects.
+#
+# @filename: the filename of the device on the host to obtain entropy from
+#            (default: "/dev/urandom")
+#
+# Since: 1.3
+##
+{ 'struct': 'RngRandomProperties',
+  'base': 'RngProperties',
+  'data': { '*filename': 'str' } }
+
 ##
 # @ObjectType:
 #
@@ -402,7 +448,10 @@
     'memory-backend-file',
     { 'name': 'memory-backend-memfd',
       'if': 'defined(CONFIG_LINUX)' },
-    'memory-backend-ram'
+    'memory-backend-ram',
+    'rng-builtin',
+    'rng-egd',
+    'rng-random'
   ] }
 
 ##
@@ -434,7 +483,10 @@
       'memory-backend-file':        'MemoryBackendFileProperties',
       'memory-backend-memfd':       { 'type': 'MemoryBackendMemfdProperties',
                                       'if': 'defined(CONFIG_LINUX)' },
-      'memory-backend-ram':         'MemoryBackendProperties'
+      'memory-backend-ram':         'MemoryBackendProperties',
+      'rng-builtin':                'RngProperties',
+      'rng-egd':                    'RngEgdProperties',
+      'rng-random':                 'RngRandomProperties'
   } }
 
 ##