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[U-Boot,26/31] dm: Add an option to enable the of-platdata feature

Message ID 1465354089-3508-27-git-send-email-sjg@chromium.org
State Accepted
Commit 2789ddb9d5bc6acd1f7a2822fed08cd7cf2a965e
Delegated to: Simon Glass
Headers show

Commit Message

Simon Glass June 8, 2016, 2:48 a.m. UTC 
Add a Kconfig option to enable this feature.

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

 dts/Kconfig | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
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Patch

diff --git a/dts/Kconfig b/dts/Kconfig
index c56c129..4b7d8b1 100644
--- 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.
+
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