dm: Add an option to enable the of-platdata feature

Add a Kconfig option to enable this feature.

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

diff --git a/dts/Kconfig b/dts/Kconfig
index c56c1299c09f65e445e80fe1da6e12516b74834c..4b7d8b15cc04d7f3a81ab7edf50268901ee4cf8c 100644 (file)
--- a/dts/Kconfig
+++ b/dts/Kconfig
@@ -85,4 +85,25 @@ config OF_SPL_REMOVE_PROPS
          can be discarded. This option defines the list of properties to
          discard.
 
+config SPL_OF_PLATDATA
+       bool "Generate platform data for use in SPL"
+       depends on SPL_OF_CONTROL
+       help
+         For very constrained SPL environments the overhead of decoding
+         device tree nodes and converting their contents into platform data
+         is too large. This overhead includes libfdt code as well as the
+         device tree contents itself. The latter is fairly compact, but the
+         former can add 3KB or more to a Thumb 2 Image.
+
+         This option enables generation of platform data from the device
+         tree as C code. This code creates devices using U_BOOT_DEVICE()
+         declarations. The benefit is that it allows driver code to access
+         the platform data directly in C structures, avoidin the libfdt
+         overhead.
+
+         This option works by generating C structure declarations for each
+         compatible string, then adding platform data and U_BOOT_DEVICE
+         declarations for each node. See README.platdata for more
+         information.
+
 endmenu