[PATCH 8/9] docs/devel: mention the spacing requirement for QOM

[Alex Bennée]

We have a more complete document on QOM but we should at least mention
the style requirements in the style guide.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 docs/devel/qom.rst   |  2 ++
 docs/devel/style.rst | 29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/docs/devel/qom.rst b/docs/devel/qom.rst
index 3e34b07c98..c9237950d0 100644
--- a/docs/devel/qom.rst
+++ b/docs/devel/qom.rst
@@ -1,3 +1,5 @@
+.. _qom:
+
 ===========================
 The QEMU Object Model (QOM)
 ===========================
diff --git a/docs/devel/style.rst b/docs/devel/style.rst
index 5bc6f2f095..0bd01f3fca 100644
--- a/docs/devel/style.rst
+++ b/docs/devel/style.rst
@@ -628,6 +628,35 @@ are still some caveats to beware of
 QEMU Specific Idioms
 ********************
 
+QEMU Object Model Declarations
+==============================
+
+The QEMU Object Model (QOM) provides a framework for handling objects
+in the base C language. The first declaration of a storage or class
+structure should always be the parent and leave a visual space between
+that declaration and the new code.
+
+.. code-block:: c
+
+    typedef struct MyDeviceState {
+        DeviceState parent_obj;
+
+        /* Properties */
+        int prop_a;
+        char *prob_b;
+        /* Other stuff */
+        int internal_state;
+    } MyDeviceState;
+
+    typedef struct MyDeviceClass {
+        ObjectClass parent_class;
+
+        void (*new_fn1)(void);
+        bool (*new_fn2)(CPUState *);
+   } MyDeviceClass;
+
+See :ref:`qom` for more details.
+
 Error handling and reporting
 ============================
 
-- 
2.39.2