diff --git a/man/udevadm.xml b/man/udevadm.xml
index b7a2494f83a..0107c575762 100644
--- a/man/udevadm.xml
+++ b/man/udevadm.xml
@@ -189,7 +189,7 @@
       </title>
       <para>Request device events from the kernel. Primarily used to replay events at system coldplug time.</para>
 
-      <para>Takes a device specification as a positional argument. See the description of <command>info</command>
+      <para>Takes device specifications as positional arguments. See the description of <command>info</command>
       above.</para>
 
       <variablelist>
@@ -298,7 +298,7 @@
           <term><option>--name-match=<replaceable>NAME</replaceable></option></term>
           <listitem>
             <para>Trigger events for devices with a matching device path. When this option is specified more than once,
-            the last <replaceable>NAME</replaceable> is used.</para>
+            then each matching result is ORed, that is, all specified devices are triggered.</para>
           </listitem>
         </varlistentry>
         <varlistentry>
@@ -306,7 +306,7 @@
           <term><option>--parent-match=<replaceable>SYSPATH</replaceable></option></term>
           <listitem>
             <para>Trigger events for all children of a given device. When this option is specified more than once,
-            the last <replaceable>NAME</replaceable> is used.</para>
+            then each matching result is ORed, that is, all children of each specified device are triggered.</para>
           </listitem>
         </varlistentry>
         <varlistentry>
@@ -332,8 +332,8 @@
         <xi:include href="standard-options.xml" xpointer="help" />
       </variablelist>
 
-      <para>In addition, an optional positional argument can be used
-      to specify device name or sys path. It must start with
+      <para>In addition, optional positional arguments can be used
+      to specify device names or sys paths. They must start with
       <filename>/dev</filename> or <filename>/sys</filename>
       respectively.</para>
     </refsect2>
diff --git a/src/libsystemd/sd-device/device-enumerator-private.h b/src/libsystemd/sd-device/device-enumerator-private.h
index 87411bfdd80..cf2b2614824 100644
--- a/src/libsystemd/sd-device/device-enumerator-private.h
+++ b/src/libsystemd/sd-device/device-enumerator-private.h
@@ -7,6 +7,7 @@ int device_enumerator_scan_devices(sd_device_enumerator *enumeartor);
 int device_enumerator_scan_subsystems(sd_device_enumerator *enumeartor);
 int device_enumerator_add_device(sd_device_enumerator *enumerator, sd_device *device);
 int device_enumerator_add_match_is_initialized(sd_device_enumerator *enumerator);
+int device_enumerator_add_match_parent_incremental(sd_device_enumerator *enumerator, sd_device *parent);
 sd_device *device_enumerator_get_first(sd_device_enumerator *enumerator);
 sd_device *device_enumerator_get_next(sd_device_enumerator *enumerator);
 sd_device **device_enumerator_get_devices(sd_device_enumerator *enumerator, size_t *ret_n_devices);
diff --git a/src/libsystemd/sd-device/device-enumerator.c b/src/libsystemd/sd-device/device-enumerator.c
index 20529aafd36..f643c6ea376 100644
--- a/src/libsystemd/sd-device/device-enumerator.c
+++ b/src/libsystemd/sd-device/device-enumerator.c
@@ -36,7 +36,7 @@ struct sd_device_enumerator {
         Hashmap *match_property;
         Set *match_sysname;
         Set *match_tag;
-        sd_device *match_parent;
+        Set *match_parent;
         bool match_allow_uninitialized;
 };
 
@@ -75,7 +75,7 @@ static sd_device_enumerator *device_enumerator_free(sd_device_enumerator *enumer
         hashmap_free_free_free(enumerator->match_property);
         set_free_free(enumerator->match_sysname);
         set_free_free(enumerator->match_tag);
-        sd_device_unref(enumerator->match_parent);
+        set_free_free(enumerator->match_parent);
 
         return mfree(enumerator);
 }
@@ -217,18 +217,42 @@ _public_ int sd_device_enumerator_add_match_tag(sd_device_enumerator *enumerator
         return 0;
 }
 
-_public_ int sd_device_enumerator_add_match_parent(sd_device_enumerator *enumerator, sd_device *parent) {
+static void device_enumerator_clear_match_parent(sd_device_enumerator *enumerator) {
+        if (!enumerator)
+                return;
+
+        set_clear_free(enumerator->match_parent);
+}
+
+int device_enumerator_add_match_parent_incremental(sd_device_enumerator *enumerator, sd_device *parent) {
+        const char *path;
+        int r;
+
         assert_return(enumerator, -EINVAL);
         assert_return(parent, -EINVAL);
 
-        sd_device_unref(enumerator->match_parent);
-        enumerator->match_parent = sd_device_ref(parent);
+        r = sd_device_get_syspath(parent, &path);
+        if (r < 0)
+                return r;
+
+        r = set_ensure_allocated(&enumerator->match_parent, NULL);
+        if (r < 0)
+                return r;
+
+        r = set_put_strdup(enumerator->match_parent, path);
+        if (r < 0)
+                return r;
 
         enumerator->scan_uptodate = false;
 
         return 0;
 }
 
+_public_ int sd_device_enumerator_add_match_parent(sd_device_enumerator *enumerator, sd_device *parent) {
+        device_enumerator_clear_match_parent(enumerator);
+        return device_enumerator_add_match_parent_incremental(enumerator, parent);
+}
+
 _public_ int sd_device_enumerator_allow_uninitialized(sd_device_enumerator *enumerator) {
         assert_return(enumerator, -EINVAL);
 
@@ -399,22 +423,24 @@ static bool match_tag(sd_device_enumerator *enumerator, sd_device *device) {
 }
 
 static bool match_parent(sd_device_enumerator *enumerator, sd_device *device) {
-        const char *devpath, *devpath_dev;
+        const char *syspath_parent, *syspath;
+        Iterator i;
         int r;
 
         assert(enumerator);
         assert(device);
 
-        if (!enumerator->match_parent)
+        if (set_isempty(enumerator->match_parent))
                 return true;
 
-        r = sd_device_get_devpath(enumerator->match_parent, &devpath);
+        r = sd_device_get_syspath(device, &syspath);
         assert(r >= 0);
 
-        r = sd_device_get_devpath(device, &devpath_dev);
-        assert(r >= 0);
+        SET_FOREACH(syspath_parent, enumerator->match_parent, i)
+                if (path_startswith(syspath, syspath_parent))
+                        return true;
 
-        return startswith(devpath_dev, devpath);
+        return false;
 }
 
 static bool match_sysname(sd_device_enumerator *enumerator, const char *sysname) {
@@ -745,18 +771,17 @@ static int parent_crawl_children(sd_device_enumerator *enumerator, const char *p
 static int enumerator_scan_devices_children(sd_device_enumerator *enumerator) {
         const char *path;
         int r = 0, k;
+        Iterator i;
 
-        r = sd_device_get_syspath(enumerator->match_parent, &path);
-        if (r < 0)
-                return r;
+        SET_FOREACH(path, enumerator->match_parent, i) {
+                k = parent_add_child(enumerator, path);
+                if (k < 0)
+                        r = k;
 
-        k = parent_add_child(enumerator, path);
-        if (k < 0)
-                r = k;
-
-        k = parent_crawl_children(enumerator, path, DEVICE_ENUMERATE_MAX_DEPTH);
-        if (k < 0)
-                r = k;
+                k = parent_crawl_children(enumerator, path, DEVICE_ENUMERATE_MAX_DEPTH);
+                if (k < 0)
+                        r = k;
+        }
 
         return r;
 }
diff --git a/src/libudev/libudev-enumerate.c b/src/libudev/libudev-enumerate.c
index e54ee572c58..80d5bafdf7d 100644
--- a/src/libudev/libudev-enumerate.c
+++ b/src/libudev/libudev-enumerate.c
@@ -277,9 +277,6 @@ _public_ int udev_enumerate_add_match_tag(struct udev_enumerate *udev_enumerate,
  * Return the devices on the subtree of one given device. The parent
  * itself is included in the list.
  *
- * A reference for the device is held until the udev_enumerate context
- * is cleaned up.
- *
  * Returns: 0 on success, otherwise a negative error value.
  */
 _public_ int udev_enumerate_add_match_parent(struct udev_enumerate *udev_enumerate, struct udev_device *parent) {
diff --git a/src/udev/udevadm-trigger.c b/src/udev/udevadm-trigger.c
index 95329469e38..2a658158e61 100644
--- a/src/udev/udevadm-trigger.c
+++ b/src/udev/udevadm-trigger.c
@@ -256,7 +256,7 @@ int trigger_main(int argc, char *argv[], void *userdata) {
                         if (r < 0)
                                 return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
 
-                        r = sd_device_enumerator_add_match_parent(e, dev);
+                        r = device_enumerator_add_match_parent_incremental(e, dev);
                         if (r < 0)
                                 return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
                         break;
@@ -272,7 +272,7 @@ int trigger_main(int argc, char *argv[], void *userdata) {
                         if (r < 0)
                                 return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
 
-                        r = sd_device_enumerator_add_match_parent(e, dev);
+                        r = device_enumerator_add_match_parent_incremental(e, dev);
                         if (r < 0)
                                 return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
                         break;
@@ -324,7 +324,7 @@ int trigger_main(int argc, char *argv[], void *userdata) {
                 if (r < 0)
                         return log_error_errno(r, "Failed to open the device '%s': %m", argv[optind]);
 
-                r = sd_device_enumerator_add_match_parent(e, dev);
+                r = device_enumerator_add_match_parent_incremental(e, dev);
                 if (r < 0)
                         return log_error_errno(r, "Failed to add parent match '%s': %m", argv[optind]);
         }