dm: of-platadata: Add option for device instantiation

Add Kconfig options to support build-time device instantiation. When
fully implemented, this will allow dtoc to create U-Boot devices (i.e.
struct udevice records) at build time, thus reducing code space in
SPL.

For now this defaults to off, but will be enabled when the rest of
the implementation is in place.

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

dts/Kconfig

@@ -355,15 +355,24 @@ config SPL_OF_PLATDATA
 	  compatible string, then adding platform data and U_BOOT_DRVINFO
 	  declarations for each node. See of-plat.txt for more information.
 
+if SPL_OF_PLATDATA
+
 config SPL_OF_PLATDATA_PARENT
 	bool "Support parent information in devices"
-	depends on SPL_OF_PLATDATA
 	default y
 	help
 	  Generally it is useful to be able to access the parent of a device
 	  with of-platdata. To save space this can be disabled, but in that
 	  case dev_get_parent() will always return NULL;
 
+config SPL_OF_PLATDATA_INST
+	bool "Declare devices at build time"
+	help
+	  Declare devices as udevice instances so that they do not need to be
+	  bound when U-Boot starts. This can save time and code space.
+
+endif
+
 config TPL_OF_PLATDATA
 	bool "Generate platform data for use in TPL"
 	depends on TPL_OF_CONTROL
@@ -385,13 +394,23 @@ config TPL_OF_PLATDATA
 	  compatible string, then adding platform data and U_BOOT_DRVINFO
 	  declarations for each node. See of-plat.txt for more information.
 
+if TPL_OF_PLATDATA
+
 config TPL_OF_PLATDATA_PARENT
 	bool "Support parent information in devices"
-	depends on TPL_OF_PLATDATA
 	default y
 	help
 	  Generally it is useful to be able to access the parent of a device
 	  with of-platdata. To save space this can be disabled, but in that
 	  case dev_get_parent() will always return NULL;
 
+config TPL_OF_PLATDATA_INST
+	bool "Declare devices at build time"
+
+	help
+	  Declare devices as udevice instances so that they do not need to be
+	  bound when U-Boot starts. This can save time and code space.
+
+endif
+
 endmenu

scripts/Makefile.spl

@@ -313,6 +313,10 @@ pythonpath = PYTHONPATH=scripts/dtc/pylibfdt
 DTOC_ARGS := $(pythonpath) $(srctree)/tools/dtoc/dtoc \
 	-d $(obj)/$(SPL_BIN).dtb -p $(SPL_NAME)
 
+ifneq ($(CONFIG_$(SPL_TPL_)OF_PLATDATA_INST),)
+DTOC_ARGS += -i
+endif
+
 quiet_cmd_dtoc = DTOC    $@
 cmd_dtoc = $(DTOC_ARGS) -c $(obj)/dts -C include/generated all