Supplementing ABI documentation with a description of the newly
added interface.

Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
 Documentation/ABI/testing/sysfs-bus-coresight-devices-etm3x | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm3x 
b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm3x
index 67e3557bc4bf..924265a1295d 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm3x
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm3x
@@ -245,6 +245,12 @@ KernelVersion:     3.19
 Contact:       Mathieu Poirier <mathieu.poir...@linaro.org>
 Description:   (RW) Define the event that controls the trigger.
 
+What:          /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/cpu
+Date:          October 2015
+KernelVersion: 4.4
+Contact:       Mathieu Poirier <mathieu.poir...@linaro.org>
+Description:   (RO) Holds the cpu number this tracer is affined to.
+
 What:          /sys/bus/coresight/devices/<memory_map>.[etm|ptm]/mgmt/etmccr
 Date:          September 2015
 KernelVersion: 4.4
-- 
1.9.1

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