Item, LED: add identifying association

Create association documentation between LED and Item.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I121cd09cd3eb032400200e51a1c94e2dfcc872cc
diff --git a/yaml/xyz/openbmc_project/Inventory/Item.interface.yaml b/yaml/xyz/openbmc_project/Inventory/Item.interface.yaml
index d74db10..f70e0b5 100644
--- a/yaml/xyz/openbmc_project/Inventory/Item.interface.yaml
+++ b/yaml/xyz/openbmc_project/Inventory/Item.interface.yaml
@@ -48,3 +48,11 @@
       reverse_name: cooling
       required_endpoint_interfaces:
           - xyz.openbmc_project.Inventory.Item.Fan
+    - name: identified_by
+      description: >
+          Objects that implement Item can optionally implement the
+          'identified_by' association to provide a link to one or more
+          LED Groups.
+      reverse_name: identifying
+      required_endpoint_interfaces:
+          - xyz.openbmc_project.Led.Group
diff --git a/yaml/xyz/openbmc_project/Inventory/Item/README.md b/yaml/xyz/openbmc_project/Inventory/Item/README.md
index a801a8f..cb66900 100644
--- a/yaml/xyz/openbmc_project/Inventory/Item/README.md
+++ b/yaml/xyz/openbmc_project/Inventory/Item/README.md
@@ -20,3 +20,4 @@
 * Item and Item: [containing, contained_by]
 * Sensor.Value and Bmc: [monitoring, monitored_by]
 * fan and item: [cooling, cooled_by]
+* led and item : [identifying, identified_by]
diff --git a/yaml/xyz/openbmc_project/Led/Group.interface.yaml b/yaml/xyz/openbmc_project/Led/Group.interface.yaml
index 56caba2..adde5ec 100644
--- a/yaml/xyz/openbmc_project/Led/Group.interface.yaml
+++ b/yaml/xyz/openbmc_project/Led/Group.interface.yaml
@@ -6,3 +6,12 @@
       description: >
           Whether or not the group is currently asserted.
           To assert a group, set to True. To de-assert a group, set to False.
+
+associations:
+    - name: identifying
+      description: >
+          Objects that implement LED group can optionally implement the
+          'identifying' association to provide a link back to a Item.
+      reverse_name: identified_by
+      required_endpoint_interfaces:
+          - xyz.openbmc_project.Inventory.Item