Documentation: coresight: trbe: Sysfs ABI description

Add sysfs ABI documentation for the TRBE devices.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
[ Split from the TRBE driver patch ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20210405164307.1720226-19-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-trbe b/Documentation/ABI/testing/sysfs-bus-coresight-devices-trbe
new file mode 100644 (file)
index 0000000..ad3bbc6
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-trbe
@@ -0,0 +1,14 @@
+What:          /sys/bus/coresight/devices/trbe<cpu>/align
+Date:          March 2021
+KernelVersion: 5.13
+Contact:       Anshuman Khandual <anshuman.khandual@arm.com>
+Description:   (Read) Shows the TRBE write pointer alignment. This value
+               is fetched from the TRBIDR register.
+
+What:          /sys/bus/coresight/devices/trbe<cpu>/flag
+Date:          March 2021
+KernelVersion: 5.13
+Contact:       Anshuman Khandual <anshuman.khandual@arm.com>
+Description:   (Read) Shows if TRBE updates in the memory are with access
+               and dirty flag updates as well. This value is fetched from
+               the TRBIDR register.