Commit ab253839 authored by David Daney's avatar David Daney Committed by Ralf Baechle
Browse files

of/lib: Allow scripts/dtc/libfdt to be used from kernel code 



libfdt is part of the device tree support in scripts/dtc/libfdt.  For
some platforms that use the Device Tree, we want to be able to edit
the flattened device tree form.

We don't want to burden kernel builds that do not require it, so we
gate compilation of libfdt files with CONFIG_LIBFDT.  So if it is
needed, you need to do this in your Kconfig:

	select LIBFDT

And in the Makefile of the code using libfdt something like:

ccflags-y := -I$(src)/../../../scripts/dtc/libfdt

Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: linux-kernel@vger.kernel.org
Acked-by: default avatarRob Herring <rob.herring@calxeda.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent a339aef9

include/linux/libfdt.h

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+8 −0
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#ifndef _INCLUDE_LIBFDT_H_

#define _INCLUDE_LIBFDT_H_



#include <linux/libfdt_env.h>

#include "../../scripts/dtc/libfdt/fdt.h"

#include "../../scripts/dtc/libfdt/libfdt.h"



#endif /* _INCLUDE_LIBFDT_H_ */

include/linux/libfdt_env.h

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#ifndef _LIBFDT_ENV_H

#define _LIBFDT_ENV_H



#include <linux/string.h>



#include <asm/byteorder.h>



#define fdt32_to_cpu(x) be32_to_cpu(x)

#define cpu_to_fdt32(x) cpu_to_be32(x)

#define fdt64_to_cpu(x) be64_to_cpu(x)

#define cpu_to_fdt64(x) cpu_to_be64(x)



#endif /* _LIBFDT_ENV_H */

lib/Kconfig

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@@ -395,4 +395,10 @@ config SIGNATURE 
	  Digital signature verification. Currently only RSA is supported.

	  Implementation is done using GnuPG MPI library



#

# libfdt files, only selected if needed.

#

config LIBFDT

	bool



endmenu

lib/Makefile

+5 −0
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@@ -130,6 +130,11 @@ obj-$(CONFIG_GENERIC_STRNLEN_USER) += strnlen_user.o 


obj-$(CONFIG_STMP_DEVICE) += stmp_device.o



libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o

$(foreach file, $(libfdt_files), \

	$(eval CFLAGS_$(file) = -I$(src)/../scripts/dtc/libfdt))

lib-$(CONFIG_LIBFDT) += $(libfdt_files)



hostprogs-y	:= gen_crc32table

clean-files	:= crc32table.h

lib/fdt.c

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#include <linux/libfdt_env.h>

#include "../scripts/dtc/libfdt/fdt.c"

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