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dm: blk: Add a comment as to why the bdev member is needed

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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>
This commit is contained in:
Simon Glass 2016-05-01 13:52:33 -06:00
parent 6dd9faf8f9
commit b6694a33c4
1 changed files with 5 additions and 0 deletions
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5
include/blk.h
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@ -63,6 +63,11 @@ struct blk_desc {
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,