coresight: binding for ETMv4 coresight drivers

Adding compatible string for new coresight ETMv4 tracer.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
index 65a6db2..62938eb 100644
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -17,6 +17,7 @@
 		- "arm,coresight-tmc", "arm,primecell";
 		- "arm,coresight-funnel", "arm,primecell";
 		- "arm,coresight-etm3x", "arm,primecell";
+		- "arm,coresight-etm4x", "arm,primecell";
 		- "qcom,coresight-replicator1x", "arm,primecell";
 
 	* reg: physical base address and length of the register