[U-Boot] [PATCH 3/5] Add comments for debug() and pr_fmt

[Simon Glass]

Add a note to each of these so it is more obvious how they work.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 include/common.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/common.h b/include/common.h
index f9f4605..a425dd9 100644
--- a/include/common.h
+++ b/include/common.h
@@ -100,6 +100,7 @@ typedef volatile unsigned char	vu_char;
 #define _DEBUG	0
 #endif
 
+/* Define this at the top of a file to add a prefix to debug messages */
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt
 #endif
@@ -115,6 +116,7 @@ typedef volatile unsigned char	vu_char;
 			printf(pr_fmt(fmt), ##args);	\
 	} while (0)
 
+/* Show a message if DEBUG is defined in a file */
 #define debug(fmt, args...)			\
 	debug_cond(_DEBUG, fmt, ##args)
 
-- 
2.8.0.rc3.226.g39d4020