[PATCH v2 5/5] Documentation: coresight: Update coresight configuration docs

[Mike Leach]

Update the CoreSight System Configuration document to cover the
use of loadable modules to add configurations and features
to the system.

Signed-off-by: Mike Leach <mike.leach at linaro.org>
---
 .../trace/coresight/coresight-config.rst      | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/trace/coresight/coresight-config.rst b/Documentation/trace/coresight/coresight-config.rst
index a4e3ef295240..911db4da7f99 100644
--- a/Documentation/trace/coresight/coresight-config.rst
+++ b/Documentation/trace/coresight/coresight-config.rst
@@ -242,3 +242,22 @@ A preset to override the current parameter values can also be selected::
 
 When configurations are selected in this way, then the trace sink used is
 automatically selected.
+
+Creating and Loading Custom Configurations
+==========================================
+
+Custom configurations and / or features can be dynamically loaded into the
+system by using a loadable module.
+
+An example of a custom configuration is found in ./samples/coresight.
+
+This creates a new configuration that uses the existing built in
+strobing feature, but provides a different set of presets.
+
+When the module is loaded, then the configuration appears in the configfs
+file system and is selectable in the same way as the built in configuration
+described above.
+
+Configurations can use previously loaded features. The system will ensure
+that it is not possible to unload a feature that is currently in use, by
+enforcing the unload order as the strict reverse of the load order.
-- 
2.17.1