[U-Boot] [PATCH v5 070/101] dm: doc: Add a note about of-platdata and header files

Simon Glass sjg at chromium.org
Mon Nov 25 04:10:20 UTC 2019

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

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

Changes in v5: None
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

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