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    Subject[RFC PATCH v3 1/6] of: Allow scripts/dtc/libfdt to be used from kernel code
    Date
    To use it you need to do this in your Kconfig:

    select LIBFDT

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

    ccflags-y := -include linux/libfdt_env.h -I$(src)/../../../scripts/dtc/libfdt

    Signed-off-by: David Daney <ddaney@caviumnetworks.com>
    ---
    drivers/of/Kconfig | 3 +++
    drivers/of/Makefile | 2 ++
    drivers/of/libfdt/Makefile | 8 ++++++++
    include/linux/libfdt.h | 8 ++++++++
    include/linux/libfdt_env.h | 13 +++++++++++++
    5 files changed, 34 insertions(+), 0 deletions(-)
    create mode 100644 drivers/of/libfdt/Makefile
    create mode 100644 include/linux/libfdt.h
    create mode 100644 include/linux/libfdt_env.h

    diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
    index d06a637..9b0474e 100644
    --- a/drivers/of/Kconfig
    +++ b/drivers/of/Kconfig
    @@ -4,6 +4,9 @@ config DTC
    config OF
    bool

    +config LIBFDT
    + bool
    +
    menu "Device Tree and Open Firmware support"
    depends on OF

    diff --git a/drivers/of/Makefile b/drivers/of/Makefile
    index f7861ed..a8dec2f 100644
    --- a/drivers/of/Makefile
    +++ b/drivers/of/Makefile
    @@ -10,3 +10,5 @@ obj-$(CONFIG_OF_NET) += of_net.o
    obj-$(CONFIG_OF_SPI) += of_spi.o
    obj-$(CONFIG_OF_MDIO) += of_mdio.o
    obj-$(CONFIG_OF_PCI) += of_pci.o
    +
    +obj-$(CONFIG_LIBFDT) += libfdt/
    diff --git a/drivers/of/libfdt/Makefile b/drivers/of/libfdt/Makefile
    new file mode 100644
    index 0000000..bda11fe
    --- /dev/null
    +++ b/drivers/of/libfdt/Makefile
    @@ -0,0 +1,8 @@
    +ccflags-y := -include linux/libfdt_env.h -I$(src)/../../../scripts/dtc/libfdt
    +
    +obj-y = fdt.o fdt_wip.o fdt_ro.o
    +
    +
    +$(obj)/%.o: $(src)/../../../scripts/dtc/libfdt/%.c FORCE
    + $(call cmd,force_checksrc)
    + $(call if_changed_rule,cc_o_c)
    diff --git a/include/linux/libfdt.h b/include/linux/libfdt.h
    new file mode 100644
    index 0000000..4c0306c
    --- /dev/null
    +++ b/include/linux/libfdt.h
    @@ -0,0 +1,8 @@
    +#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_ */
    diff --git a/include/linux/libfdt_env.h b/include/linux/libfdt_env.h
    new file mode 100644
    index 0000000..01508c7
    --- /dev/null
    +++ b/include/linux/libfdt_env.h
    @@ -0,0 +1,13 @@
    +#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 */
    --
    1.7.2.3


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