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-rw-r--r--Documentation/input/alps.txt2
-rw-r--r--Documentation/input/event-codes.txt11
2 files changed, 12 insertions, 1 deletions
diff --git a/Documentation/input/alps.txt b/Documentation/input/alps.txt
index 9b1084c8c0b3..e544c7ff8cfa 100644
--- a/Documentation/input/alps.txt
+++ b/Documentation/input/alps.txt
@@ -161,7 +161,7 @@ number of contacts (f1 and f0 in the table below).
This packet only appears after a position packet with the mt bit set, and
usually only appears when there are two or more contacts (although
-occassionally it's seen with only a single contact).
+occasionally it's seen with only a single contact).
The final v3 packet type is the trackstick packet.
diff --git a/Documentation/input/event-codes.txt b/Documentation/input/event-codes.txt
index 53305bd08182..f1ea2c69648d 100644
--- a/Documentation/input/event-codes.txt
+++ b/Documentation/input/event-codes.txt
@@ -196,6 +196,17 @@ EV_MSC:
EV_MSC events are used for input and output events that do not fall under other
categories.
+A few EV_MSC codes have special meaning:
+
+* MSC_TIMESTAMP:
+ - Used to report the number of microseconds since the last reset. This event
+ should be coded as an uint32 value, which is allowed to wrap around with
+ no special consequence. It is assumed that the time difference between two
+ consecutive events is reliable on a reasonable time scale (hours).
+ A reset to zero can happen, in which case the time since the last event is
+ unknown. If the device does not provide this information, the driver must
+ not provide it to user space.
+
EV_LED:
----------
EV_LED events are used for input and output to set and query the state of