Merge branch 'for-6.19-vsprintf-timespec64' into for-linus

1 files changed, 9 insertions, 2 deletions

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index 7f2f11b48286..c0b1b6089307 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -547,11 +547,13 @@ Time and date
 	%pt[RT]s		YYYY-mm-dd HH:MM:SS
 	%pt[RT]d		YYYY-mm-dd
 	%pt[RT]t		HH:MM:SS
-	%pt[RT][dt][r][s]
+	%ptSp			<seconds>.<nanoseconds>
+	%pt[RST][dt][r][s]
 
 For printing date and time as represented by::
 
-	R  struct rtc_time structure
+	R  content of struct rtc_time
+	S  content of struct timespec64
 	T  time64_t type
 
 in human readable format.
@@ -563,6 +565,11 @@ The %pt[RT]s (space) will override ISO 8601 separator by using ' ' (space)
 instead of 'T' (Capital T) between date and time. It won't have any effect
 when date or time is omitted.
 
+The %ptSp is equivalent to %lld.%09ld for the content of the struct timespec64.
+When the other specifiers are given, it becomes the respective equivalent of
+%ptT[dt][r][s].%09ld. In other words, the seconds are being printed in
+the human readable format followed by a dot and nanoseconds.
+
 Passed by reference.
 
 struct clk