dm: blk: Add a comment as to why the bdev member is needed
This member should be explained, since it is not obvious why it is needed.
Add a comment.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/blk.h b/include/blk.h
index 3fa373e..66a1c55 100644
--- a/include/blk.h
+++ b/include/blk.h
@@ -63,6 +63,11 @@
char product[20+1]; /* IDE Serial no, SCSI product */
char revision[8+1]; /* firmware revision */
#ifdef CONFIG_BLK
+ /*
+ * For now we have a few functions which take struct blk_desc as a
+ * parameter. This field allows them to look up the associated
+ * device. Once these functions are removed we can drop this field.
+ */
struct udevice *bdev;
#else
unsigned long (*block_read)(struct blk_desc *block_dev,