device connection: Find connections also by checking the references

We can also use this API to find named references that the
device nodes have by using fwnode_property_get_reference_args()
function.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 27 insertions, 1 deletions

diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index 04db9ae235e4..f7035fc12b92 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -38,6 +38,28 @@ fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
         return NULL;
 }
 
+static void *
+fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
+                    void *data, devcon_match_fn_t match)
+{
+        struct device_connection con = { };
+        void *ret;
+        int i;
+
+        for (i = 0; ; i++) {
+                con.fwnode = fwnode_find_reference(fwnode, con_id, i);
+                if (IS_ERR(con.fwnode))
+                        break;
+
+                ret = match(&con, -1, data);
+                fwnode_handle_put(con.fwnode);
+                if (ret)
+                        return ret;
+        }
+
+        return NULL;
+}
+
 /**
  * device_connection_find_match - Find physical connection to a device
  * @dev: Device with the connection
@@ -65,6 +87,10 @@ void *device_connection_find_match(struct device *dev, const char *con_id,
                 ret = fwnode_graph_devcon_match(fwnode, con_id, data, match);
                 if (ret)
                         return ret;
+
+                ret = fwnode_devcon_match(fwnode, con_id, data, match);
+                if (ret)
+                        return ret;
         }
 
         mutex_lock(&devcon_lock);
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index f45d8df5cfb8..86defca6623e 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -101,7 +101,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
         struct device *dev;
 
         if (con->fwnode) {
-                if (!fwnode_property_present(con->fwnode, con->id))
+                if (con->id && !fwnode_property_present(con->fwnode, con->id))
                         return NULL;
 
                 dev = class_find_device(role_class, NULL, con->fwnode,