doc: Add binding document for fconf.
Complete the documentation with information on how to write a DTS for
fconf. This patch adds the bindings information for dynamic
configuration properties.
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
Change-Id: Ic6d9f927df53bb87315c23ec5a8943d0c3258d45
diff --git a/docs/components/fconf/fconf_properties.rst b/docs/components/fconf/fconf_properties.rst
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+DTB binding for FCONF properties
+================================
+
+This document describes the device tree format of |FCONF| properties. These
+properties are not related to a specific platform and can be queried from
+common code.
+
+Dynamic configuration
+~~~~~~~~~~~~~~~~~~~~~
+
+The |FCONF| framework expects a *dtb-registry* node with the following field:
+
+- compatible [mandatory]
+ - value type: <string>
+ - Must be the string "fconf,dyn_cfg-dtb_registry".
+
+Then a list of subnodes representing a configuration |DTB|, which can be used
+by |FCONF|. Each subnode should be named according to the information it
+contains, and must be formed with the following fields:
+
+- load-address [mandatory]
+ - value type: <u64>
+ - Physical loading base address of the configuration.
+
+- max-size [mandatory]
+ - value type: <u32>
+ - Maximum size of the configuration.
+
+- id [mandatory]
+ - value type: <u32>
+ - Image ID of the configuration.
+