diff --git a/yaml/xyz/openbmc_project/Software/Update.errors.yaml b/yaml/xyz/openbmc_project/Software/Update.errors.yaml
new file mode 100644
index 0000000..039577b
--- /dev/null
+++ b/yaml/xyz/openbmc_project/Software/Update.errors.yaml
@@ -0,0 +1,10 @@
+- name: Incompatible
+  description: >
+      The system component has a software version which is incompatible with the
+      new image or the image is not meant for the system component.
+- name: InvalidSignature
+  description: >
+      Signature Validation failed for the supplied firmware image.
+- name: InvalidImage
+  description: >
+      The supplied firmware image is invalid or corrupt.
diff --git a/yaml/xyz/openbmc_project/Software/Update.interface.yaml b/yaml/xyz/openbmc_project/Software/Update.interface.yaml
new file mode 100644
index 0000000..5bd388f
--- /dev/null
+++ b/yaml/xyz/openbmc_project/Software/Update.interface.yaml
@@ -0,0 +1,51 @@
+description: >
+    Interface for performing code update for various firwmare entities.
+
+methods:
+    - name: StartUpdate
+      description: >
+          Start a firware update to be performed asynchronously.
+      parameters:
+          - name: Image
+            type: unixfd
+            description: >
+                This property indicates the file descriptor of the firmware
+                image.
+          - name: ApplyTime
+            type: enum[self.ApplyTimes]
+            description: >
+                This property indicates when the software image update should be
+                applied.
+      returns:
+          - name: ObjectPath
+            type: object_path
+            description: >
+                The object path where the image interfaces will be hosted, for
+                example, required interfaces such as ActivationStatus,
+                ActivationProgress and optional interfaces such as Version.
+      errors:
+          - xyz.openbmc_project.Software.Update.Error.Incompatible
+          - xyz.openbmc_project.Software.Update.Error.InvalidSignature
+          - xyz.openbmc_project.Software.Update.Error.InvalidImage
+          - xyz.openbmc_project.Common.Error.Unavailable
+
+properties:
+    - name: AllowedApplyTimes
+      type: set[enum[self.ApplyTimes]]
+      description: >
+          This property indicates the apply times allowed for this device.
+      flags:
+          - readonly
+
+enumerations:
+    - name: ApplyTimes
+      description: >
+          The possible values of this property indicate when the newly updated
+          software image will be activated.
+      values:
+          - name: Immediate
+            description: >
+                Apply immediately.
+          - name: OnReset
+            description: >
+                Apply on reset of device being updated.
diff --git a/yaml/xyz/openbmc_project/Software/Version.interface.yaml b/yaml/xyz/openbmc_project/Software/Version.interface.yaml
index ee4d5ac..58fe2b5 100644
--- a/yaml/xyz/openbmc_project/Software/Version.interface.yaml
+++ b/yaml/xyz/openbmc_project/Software/Version.interface.yaml
@@ -42,3 +42,24 @@
           - name: PSU
             description: >
                 The version is a version for a PSU.
+
+associations:
+    - name: running
+      description: >
+          This indicates the current running version for the associated
+          inventory item.
+      reverse_names:
+          - ran_on
+      required_endpoint_interfaces:
+          - xyz.openbmc_project.Inventory.Item
+    - name: activating
+      description: >
+          This indicates the current activated version for the associated
+          inventory item. There can be more than one active version associated
+          with the same inventory item. In such a case, RedundancyPriority
+          interface will help to decide the correct priority order for the
+          active version transition to running.
+      reverse_names:
+          - activated_on
+      required_endpoint_interfaces:
+          - xyz.openbmc_project.Inventory.Item