Adding compatible string for new coresight debug driver.

Signed-off-by: Leo Yan <leo....@linaro.org>
---
 Documentation/devicetree/bindings/arm/coresight.txt | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/coresight.txt 
b/Documentation/devicetree/bindings/arm/coresight.txt
index fcbae6a..3ff15fd 100644
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -40,6 +40,9 @@ its hardware characteristcs.
                - System Trace Macrocell:
                        "arm,coresight-stm", "arm,primecell"; [1]
 
+               - Debug Unit:
+                       "arm,coresight-debug", "arm,primecell";
+
        * reg: physical base address and length of the register
          set(s) of the component.
 
@@ -78,8 +81,10 @@ its hardware characteristcs.
        * arm,cp14: must be present if the system accesses ETM/PTM management
          registers via co-processor 14.
 
-       * cpu: the cpu phandle this ETM/PTM is affined to. When omitted the
-         source is considered to belong to CPU0.
+* Optional properties for ETM/PTM/Debugs:
+
+       * cpu: the cpu phandle this ETM/PTM/Debug is affined to. When omitted
+         the source is considered to belong to CPU0.
 
 * Optional property for TMC:
 
-- 
2.7.4

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