dm: core: Clarify uclass_first/next_device() comments
These are not as clear as they could be. Tidy them up a bit. Also fix a
tiny code-style nit.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index 7f5a130..4dcd883 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -241,8 +241,13 @@
*
* The device returned is probed if necessary, and ready for use
*
+ * This function is useful to start iterating through a list of devices which
+ * are functioning correctly and can be probed.
+ *
* @id: Uclass ID to look up
- * @devp: Returns pointer to the first device in that uclass, or NULL if none
+ * @devp: Returns pointer to the first device in that uclass if no error
+ * occurred, or NULL if there is no first device, or an error occurred with
+ * that device.
* @return 0 if OK (found or not found), other -ve on error
*/
int uclass_first_device(enum uclass_id id, struct udevice **devp);
@@ -263,8 +268,12 @@
*
* The device returned is probed if necessary, and ready for use
*
+ * This function is useful to start iterating through a list of devices which
+ * are functioning correctly and can be probed.
+ *
* @devp: On entry, pointer to device to lookup. On exit, returns pointer
- * to the next device in the same uclass, or NULL if none
+ * to the next device in the uclass if no error occurred, or NULL if there is
+ * no next device, or an error occurred with that next device.
* @return 0 if OK (found or not found), other -ve on error
*/
int uclass_next_device(struct udevice **devp);