[U-Boot] [PATCH v4 070/100] dm: doc: Add a note about of-platdata and header files

[Simon Glass]

We don't want to include dt-structs.h in header files, so add a note about
that.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v4:
- Add a patch to explain of-platdata and header files

Changes in v3: None
Changes in v2: None

 doc/driver-model/of-plat.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/driver-model/of-plat.rst b/doc/driver-model/of-plat.rst
index 557957d2a1..034a68bb4e 100644
--- a/doc/driver-model/of-plat.rst
+++ b/doc/driver-model/of-plat.rst
@@ -279,6 +279,12 @@ For example:
     };
 
 
+Note that struct mmc_platdata is defined in the C file, not in a header. This
+is to avoid needing to include dt-structs.h in a header file. The idea is to
+keep the use of each of-platdata struct to the smallest possible code area.
+There is just one driver C file for each struct, that can convert from the
+of-platdata struct to the standard one used by the driver.
+
 In the case where SPL_OF_PLATDATA is enabled, platdata_auto_alloc_size is
 still used to allocate space for the platform data. This is different from
 the normal behaviour and is triggered by the use of of-platdata (strictly
-- 
2.24.0.432.g9d3f5f5b63-goog