[PATCH 28/31] dts: bindings: coresight: ETM system register access only units

[Mathieu Poirier]

From: Suzuki K Poulose <suzuki.poulose at arm.com>

Document the bindings for ETMs with system register accesses.

Cc: devicetree at vger.kernel.org
Cc: Mathieu Poirier <mathieu.poirier at linaro.org>
Cc: Mike Leach <mike.leach at linaro.org>
Acked-by: Rob Herring <robh at kernel.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
Link: https://lore.kernel.org/r/20210110224850.1880240-27-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier at linaro.org>
---
 Documentation/devicetree/bindings/arm/coresight.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
index d711676b4a51..7f9c1ca87487 100644
--- a/Documentation/devicetree/bindings/arm/coresight.txt
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -34,9 +34,12 @@ its hardware characteristcs.
 					Program Flow Trace Macrocell:
 			"arm,coresight-etm3x", "arm,primecell";
 
-		- Embedded Trace Macrocell (version 4.x):
+		- Embedded Trace Macrocell (version 4.x), with memory mapped access.
 			"arm,coresight-etm4x", "arm,primecell";
 
+		- Embedded Trace Macrocell (version 4.x), with system register access only.
+			"arm,coresight-etm4x-sysreg";
+
 		- Coresight programmable Replicator :
 			"arm,coresight-dynamic-replicator", "arm,primecell";
 
-- 
2.25.1