of: add config option to enable building of all dtbs

Enable building all dtb files when CONFIG_OF_ALL_DTBS is enabled. The dtbs
are not really dependent on a platform being enabled or any other kernel
config, so for testing coverage it is convenient to build all of the dtbs.

In order to only build dtbs, this option can be used by creating an
allno.config file containing:
CONFIG_COMPILE_TEST=y
CONFIG_OF=y
CONFIG_OF_ALL_DTBS=y

And then running:
make KCONFIG_ALLCONFIG=1 allnoconfig
make dtbs

While building the dtbs themselves don't need a cross compiler, the
scripts dependency does need one. This can be hacked around by
commenting out "subdir-y += mod" in scripts/Makefile.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Grant Likely <grant.likely@linaro.org>

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 59bb8556e43ac8f975485465ca8d1b0fdfeba3c5..e2a48415d9691059f1beb2afee7f134019d65ecf 100644 (file)
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -23,6 +23,16 @@ config OF_UNITTEST
 
          If unsure, say N here, but this option is safe to enable.
 
+config OF_ALL_DTBS
+       bool "Build all Device Tree Blobs"
+       depends on COMPILE_TEST
+       select DTC
+       help
+         This option builds all possible Device Tree Blobs (DTBs) for the
+         current architecture.
+
+         If unsure, say N here, but this option is safe to enable.
+
 config OF_FLATTREE
        bool
        select DTC