drm/doc: diagram for mode objects and properties
Resulted in confusion a few times in the past.
v2: Spelling fix (Eric).
Cc: Eric Anholt <eric@anholt.net>
Acked-by: Eric Anholt <eric@anholt.net>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170302151638.1882-5-daniel.vetter@ffwll.ch
diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
index b11c537..1c42448 100644
--- a/Documentation/gpu/drm-kms.rst
+++ b/Documentation/gpu/drm-kms.rst
@@ -161,6 +161,28 @@
Modeset Base Object Abstraction
===============================
+.. kernel-render:: DOT
+ :alt: Mode Objects and Properties
+ :caption: Mode Objects and Properties
+
+ digraph {
+ node [shape=box]
+
+ "drm_property A" -> "drm_mode_object A"
+ "drm_property A" -> "drm_mode_object B"
+ "drm_property B" -> "drm_mode_object A"
+ }
+
+The base structure for all KMS objects is :c:type:`struct drm_mode_object
+<drm_mode_object>`. One of the base services it provides is tracking properties,
+which are especially important for the atomic IOCTL (see `Atomic Mode
+Setting`_). The somewhat surprising part here is that properties are not
+directly instantiated on each object, but free-standing mode objects themselves,
+represented by :c:type:`struct drm_property <drm_property>`, which only specify
+the type and value range of a property. Any given property can be attached
+multiple times to different objects using :c:func:`drm_object_attach_property()
+<drm_object_attach_property>`.
+
.. kernel-doc:: include/drm/drm_mode_object.h
:internal: