X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=Documentation%2Fcore-api%2Fprintk-formats.rst;h=4346ae17a72c356ee640406636cc0db709e8dbf8;hb=cc396d27d8d5884bbb555efd7783b9e9e2b41dc2;hp=7b6bfd8a78d35feee819c34dc8acbef636560ba6;hpb=94f2be50badfa88e96033e77621c6711d58f84d3;p=linux-2.6-microblaze.git

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index 7b6bfd8a78d3..4346ae17a72c 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -37,14 +37,13 @@ Integer types
 		u64			%llu or %llx
 
 
-If <type> is dependent on a config option for its size (e.g., sector_t,
-blkcnt_t) or is architecture-dependent for its size (e.g., tcflag_t), use a
-format specifier of its largest possible type and explicitly cast to it.
+If <type> is architecture-dependent for its size (e.g., cycles_t, tcflag_t) or
+is dependent on a config option for its size (e.g., blk_status_t), use a format
+specifier of its largest possible type and explicitly cast to it.
 
 Example::
 
-	printk("test: sector number/total blocks: %llu/%llu\n",
-		(unsigned long long)sector, (unsigned long long)blockcount);
+	printk("test: latency: %llu cycles\n", (unsigned long long)time);
 
 Reminder: sizeof() returns type size_t.
 
@@ -596,6 +595,24 @@ For printing netdev_features_t.
 
 Passed by reference.
 
+V4L2 and DRM FourCC code (pixel format)
+---------------------------------------
+
+::
+
+	%p4cc
+
+Print a FourCC code used by V4L2 or DRM, including format endianness and
+its numerical value as hexadecimal.
+
+Passed by reference.
+
+Examples::
+
+	%p4cc	BG12 little-endian (0x32314742)
+	%p4cc	Y10  little-endian (0x20303159)
+	%p4cc	NV12 big-endian (0xb231564e)
+
 Thanks
 ======