coresight: document binding acronyms

It can be hard for people not familiar with the CoreSight IP blocks
to make sense of the acronyms found in the current bindings.  As such
this patch expands each acronym in the hope of providing a better
description of the IP block they represent.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
index 93147c0c8a0e2f14f5bec30ab5b5e711adc1c9d4..fcbae6a5e6c1563eba0335dfd58a67cd59ca567b 100644 (file)
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -12,14 +12,33 @@ its hardware characteristcs.
 
        * compatible: These have to be supplemented with "arm,primecell" as
          drivers are using the AMBA bus interface.  Possible values include:
-               - "arm,coresight-etb10", "arm,primecell";
-               - "arm,coresight-tpiu", "arm,primecell";
-               - "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";
-               - "arm,coresight-stm", "arm,primecell"; [1]
+               - Embedded Trace Buffer (version 1.0):
+                       "arm,coresight-etb10", "arm,primecell";
+
+               - Trace Port Interface Unit:
+                       "arm,coresight-tpiu", "arm,primecell";
+
+               - Trace Memory Controller, used for Embedded Trace Buffer(ETB),
+                 Embedded Trace FIFO(ETF) and Embedded Trace Router(ETR)
+                 configuration.  The configuration mode (ETB, ETF, ETR) is
+                 discovered at boot time when the device is probed.
+                       "arm,coresight-tmc", "arm,primecell";
+
+               - Trace Funnel:
+                       "arm,coresight-funnel", "arm,primecell";
+
+               - Embedded Trace Macrocell (version 3.x) and
+                                       Program Flow Trace Macrocell:
+                       "arm,coresight-etm3x", "arm,primecell";
+
+               - Embedded Trace Macrocell (version 4.x):
+                       "arm,coresight-etm4x", "arm,primecell";
+
+               - Qualcomm Configurable Replicator (version 1.x):
+                       "qcom,coresight-replicator1x", "arm,primecell";
+
+               - System Trace Macrocell:
+                       "arm,coresight-stm", "arm,primecell"; [1]
 
        * reg: physical base address and length of the register
          set(s) of the component.