fdt: Create a new OF_REAL Kconfig

The condition to indicate whether there is a runtime devicetree available
is OF_CONTROL && !OF_PLATDATA. This is a bit unweidly and is repeated in
a lot of places.

Add a new OF_REAL Kconfig which provides this information directly.

Note: This is similar in effect to LIBFDT. We might consider dropping
LIBFDT and using this instead, but this is left for now as we also have
OF_LIBFDT_OVERLAY which it would not make sense to change.

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

diff --git a/dts/Kconfig b/dts/Kconfig
index dabe0080c1eff6e473e554bdc5cb10aa50b20a97..d853aaafbc185d2a6d2d6431ba1f6bb6e5e67369 100644 (file)
--- a/dts/Kconfig
+++ b/dts/Kconfig
@@ -48,6 +48,14 @@ config OF_CONTROL
          This feature provides for run-time configuration of U-Boot
          via a flattened device tree.
 
+config OF_REAL
+       def_bool y
+       help
+         Indicates that a real devicetree is available which can be accessed
+         at runtime. This means that dev_read_...() functions can be used to
+         read data from the devicetree for each device. This is true if
+         OF_CONTROL is enabled in U-Boot proper.
+
 config OF_BOARD_FIXUP
        bool "Board-specific manipulation of Device Tree"
        help
@@ -62,6 +70,7 @@ config SPL_OF_CONTROL
        bool "Enable run-time configuration via Device Tree in SPL"
        depends on SPL && OF_CONTROL
        select SPL_OF_LIBFDT if !SPL_OF_PLATDATA
+       select SPL_OF_REAL if !SPL_OF_PLATDATA
        help
          Some boards use device tree in U-Boot but only have 4KB of SRAM
          which is not enough to support device tree. Disable this option to
@@ -71,6 +80,7 @@ config TPL_OF_CONTROL
        bool "Enable run-time configuration via Device Tree in TPL"
        depends on TPL && OF_CONTROL
        select TPL_OF_LIBFDT if !TPL_OF_PLATDATA
+       select TPL_OF_REAL if !TPL_OF_PLATDATA
        help
          Some boards use device tree in U-Boot but only have 4KB of SRAM
          which is not enough to support device tree. Enable this option to
@@ -236,7 +246,7 @@ config MULTI_DTB_FIT
 
 
 config SPL_MULTI_DTB_FIT
-       depends on SPL_LOAD_FIT && SPL_OF_CONTROL && !SPL_OF_PLATDATA
+       depends on SPL_LOAD_FIT && SPL_OF_REAL
        bool "Support embedding several DTBs in a FIT image for the SPL"
        help
          This option provides the SPL with the ability to select its own
@@ -374,6 +384,14 @@ 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.
 
+config SPL_OF_REAL
+       bool
+       help
+         Indicates that a real devicetree is available which can be accessed
+         at runtime. This means that dev_read_...() functions can be used to
+         read data from the devicetree for each device. This is true if
+         SPL_OF_CONTROL is enabled and not SPL_OF_PLATDATA
+
 if SPL_OF_PLATDATA
 
 config SPL_OF_PLATDATA_PARENT
@@ -421,6 +439,14 @@ config SPL_OF_PLATDATA_DRIVER_RT
 
 endif
 
+config TPL_OF_REAL
+       bool
+       help
+         Indicates that a real devicetree is available which can be accessed
+         at runtime. This means that dev_read_...() functions can be used to
+         read data from the devicetree for each device. This is true if
+         TPL_OF_CONTROL is enabled and not TPL_OF_PLATDATA
+
 config TPL_OF_PLATDATA
        bool "Generate platform data for use in TPL"
        depends on TPL_OF_CONTROL