diff --git a/drivers/staging/greybus/Documentation/sysfs-bus-greybus b/drivers/staging/greybus/Documentation/sysfs-bus-greybus
index 808fde96f56b..acc405456198 100644
--- a/drivers/staging/greybus/Documentation/sysfs-bus-greybus
+++ b/drivers/staging/greybus/Documentation/sysfs-bus-greybus
@@ -126,6 +126,14 @@ Description:
 		3 - error
 		4 - destroying
 
+What:		/sys/bus/greybus/device/.../ap_cport_id
+Date:		October 2015
+KernelVersion:	4.XX
+Contact:	Greg Kroah-Hartman <greg@kroah.com>
+Description:
+		The cport ID of the AP, to which cport of the module is
+		connected.
+
 What:		/sys/bus/greybus/device/.../protocol_id
 Date:		October 2015
 KernelVersion:	4.XX
diff --git a/drivers/staging/greybus/connection.c b/drivers/staging/greybus/connection.c
index 3dcbb7832a58..dc45298ad099 100644
--- a/drivers/staging/greybus/connection.c
+++ b/drivers/staging/greybus/connection.c
@@ -116,9 +116,18 @@ protocol_id_show(struct device *dev, struct device_attribute *attr, char *buf)
 }
 static DEVICE_ATTR_RO(protocol_id);
 
+static ssize_t
+ap_cport_id_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct gb_connection *connection = to_gb_connection(dev);
+	return sprintf(buf, "%hu\n", connection->hd_cport_id);
+}
+static DEVICE_ATTR_RO(ap_cport_id);
+
 static struct attribute *connection_attrs[] = {
 	&dev_attr_state.attr,
 	&dev_attr_protocol_id.attr,
+	&dev_attr_ap_cport_id.attr,
 	NULL,
 };