lib: libfdt: wrap scripts/dtc/libfdt/* where possible

lib/libfdt/ and scripts/dtc/libfdt have the same copies for the
followings 6 files:
  fdt.c fdt_addresses.c fdt_empty_tree.c fdt_overlay.c fdt_strerr.c
  fdt_sw.c

Make them a wrapper of scripts/dtc/libfdt/*.  This is exactly what
Linux does to sync libfdt.  In order to make is possible, import
<linux/libfdt.h> and <linux/libfdt_env.h> from Linux 4.14-rc5.

Unfortunately, U-Boot locally modified the following 3 files:
  fdt_ro.c fdt_wip.c fdt_rw.c

The fdt_region.c is U-Boot own file.

I did not touch them in order to avoid unpredictable impact.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

7 files changed, 24 insertions, 1483 deletions

diff --git a/lib/libfdt/Makefile b/lib/libfdt/Makefile
index 6ef8290f4e..369bbf9ba3 100644
--- a/lib/libfdt/Makefile
+++ b/lib/libfdt/Makefile
@@ -5,15 +5,22 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
+# Use upstream code.
 obj-y += \
 	fdt.o \
-	fdt_ro.o \
-	fdt_rw.o \
 	fdt_strerror.o \
 	fdt_sw.o \
-	fdt_wip.o \
 	fdt_empty_tree.o \
-	fdt_addresses.o \
-	fdt_region.o
+	fdt_addresses.o
 
 obj-$(CONFIG_OF_LIBFDT_OVERLAY) += fdt_overlay.o
+
+# Locally modified for U-Boot.
+# TODO: split out the local modifiction.
+obj-y += \
+	fdt_ro.o \
+	fdt_rw.o \
+	fdt_wip.o \
+
+# U-Boot own file
+obj-y += fdt_region.o
diff --git a/lib/libfdt/fdt.c b/lib/libfdt/fdt.c
index 2055734012..0958e6ba57 100644
--- a/lib/libfdt/fdt.c
+++ b/lib/libfdt/fdt.c
@@ -1,210 +1,2 @@
-/*
- * libfdt - Flat Device Tree manipulation
- * Copyright (C) 2006 David Gibson, IBM Corporation.
- * SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause
- */
-#include <libfdt_env.h>
-
-#ifndef USE_HOSTCC
-#include <fdt.h>
-#include <libfdt.h>
-#else
-#include "fdt_host.h"
-#endif
-
-#include "libfdt_internal.h"
-
-int fdt_check_header(const void *fdt)
-{
-	if (fdt_magic(fdt) == FDT_MAGIC) {
-		/* Complete tree */
-		if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
-			return -FDT_ERR_BADVERSION;
-		if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION)
-			return -FDT_ERR_BADVERSION;
-	} else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
-		/* Unfinished sequential-write blob */
-		if (fdt_size_dt_struct(fdt) == 0)
-			return -FDT_ERR_BADSTATE;
-	} else {
-		return -FDT_ERR_BADMAGIC;
-	}
-
-	return 0;
-}
-
-const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
-{
-	unsigned absoffset = offset + fdt_off_dt_struct(fdt);
-
-	if ((absoffset < offset)
-	    || ((absoffset + len) < absoffset)
-	    || (absoffset + len) > fdt_totalsize(fdt))
-		return NULL;
-
-	if (fdt_version(fdt) >= 0x11)
-		if (((offset + len) < offset)
-		    || ((offset + len) > fdt_size_dt_struct(fdt)))
-			return NULL;
-
-	return _fdt_offset_ptr(fdt, offset);
-}
-
-uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
-{
-	const fdt32_t *tagp, *lenp;
-	uint32_t tag;
-	int offset = startoffset;
-	const char *p;
-
-	*nextoffset = -FDT_ERR_TRUNCATED;
-	tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
-	if (!tagp)
-		return FDT_END; /* premature end */
-	tag = fdt32_to_cpu(*tagp);
-	offset += FDT_TAGSIZE;
-
-	*nextoffset = -FDT_ERR_BADSTRUCTURE;
-	switch (tag) {
-	case FDT_BEGIN_NODE:
-		/* skip name */
-		do {
-			p = fdt_offset_ptr(fdt, offset++, 1);
-		} while (p && (*p != '\0'));
-		if (!p)
-			return FDT_END; /* premature end */
-		break;
-
-	case FDT_PROP:
-		lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
-		if (!lenp)
-			return FDT_END; /* premature end */
-		/* skip-name offset, length and value */
-		offset += sizeof(struct fdt_property) - FDT_TAGSIZE
-			+ fdt32_to_cpu(*lenp);
-		break;
-
-	case FDT_END:
-	case FDT_END_NODE:
-	case FDT_NOP:
-		break;
-
-	default:
-		return FDT_END;
-	}
-
-	if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
-		return FDT_END; /* premature end */
-
-	*nextoffset = FDT_TAGALIGN(offset);
-	return tag;
-}
-
-int _fdt_check_node_offset(const void *fdt, int offset)
-{
-	if ((offset < 0) || (offset % FDT_TAGSIZE)
-	    || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
-		return -FDT_ERR_BADOFFSET;
-
-	return offset;
-}
-
-int _fdt_check_prop_offset(const void *fdt, int offset)
-{
-	if ((offset < 0) || (offset % FDT_TAGSIZE)
-	    || (fdt_next_tag(fdt, offset, &offset) != FDT_PROP))
-		return -FDT_ERR_BADOFFSET;
-
-	return offset;
-}
-
-int fdt_next_node(const void *fdt, int offset, int *depth)
-{
-	int nextoffset = 0;
-	uint32_t tag;
-
-	if (offset >= 0)
-		if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0)
-			return nextoffset;
-
-	do {
-		offset = nextoffset;
-		tag = fdt_next_tag(fdt, offset, &nextoffset);
-
-		switch (tag) {
-		case FDT_PROP:
-		case FDT_NOP:
-			break;
-
-		case FDT_BEGIN_NODE:
-			if (depth)
-				(*depth)++;
-			break;
-
-		case FDT_END_NODE:
-			if (depth && ((--(*depth)) < 0))
-				return nextoffset;
-			break;
-
-		case FDT_END:
-			if ((nextoffset >= 0)
-			    || ((nextoffset == -FDT_ERR_TRUNCATED) && !depth))
-				return -FDT_ERR_NOTFOUND;
-			else
-				return nextoffset;
-		}
-	} while (tag != FDT_BEGIN_NODE);
-
-	return offset;
-}
-
-int fdt_first_subnode(const void *fdt, int offset)
-{
-	int depth = 0;
-
-	offset = fdt_next_node(fdt, offset, &depth);
-	if (offset < 0 || depth != 1)
-		return -FDT_ERR_NOTFOUND;
-
-	return offset;
-}
-
-int fdt_next_subnode(const void *fdt, int offset)
-{
-	int depth = 1;
-
-	/*
-	 * With respect to the parent, the depth of the next subnode will be
-	 * the same as the last.
-	 */
-	do {
-		offset = fdt_next_node(fdt, offset, &depth);
-		if (offset < 0 || depth < 1)
-			return -FDT_ERR_NOTFOUND;
-	} while (depth > 1);
-
-	return offset;
-}
-
-const char *_fdt_find_string(const char *strtab, int tabsize, const char *s)
-{
-	int len = strlen(s) + 1;
-	const char *last = strtab + tabsize - len;
-	const char *p;
-
-	for (p = strtab; p <= last; p++)
-		if (memcmp(p, s, len) == 0)
-			return p;
-	return NULL;
-}
-
-int fdt_move(const void *fdt, void *buf, int bufsize)
-{
-	FDT_CHECK_HEADER(fdt);
-
-	if (fdt_totalsize(fdt) > bufsize)
-		return -FDT_ERR_NOSPACE;
-
-	memmove(buf, fdt, fdt_totalsize(fdt));
-	return 0;
-}
+#include <linux/libfdt_env.h>
+#include "../../scripts/dtc/libfdt/fdt.c"
diff --git a/lib/libfdt/fdt_addresses.c b/lib/libfdt/fdt_addresses.c
index b6bc66ea32..b82a02936c 100644
--- a/lib/libfdt/fdt_addresses.c
+++ b/lib/libfdt/fdt_addresses.c
@@ -1,55 +1,2 @@
-/*
- * libfdt - Flat Device Tree manipulation
- * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
- * SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause
- */
-#include <libfdt_env.h>
-
-#ifndef USE_HOSTCC
-#include <fdt.h>
-#include <libfdt.h>
-#else
-#include "fdt_host.h"
-#endif
-
-#include "libfdt_internal.h"
-
-int fdt_address_cells(const void *fdt, int nodeoffset)
-{
-	const fdt32_t *ac;
-	int val;
-	int len;
-
-	ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len);
-	if (!ac)
-		return 2;
-
-	if (len != sizeof(*ac))
-		return -FDT_ERR_BADNCELLS;
-
-	val = fdt32_to_cpu(*ac);
-	if ((val <= 0) || (val > FDT_MAX_NCELLS))
-		return -FDT_ERR_BADNCELLS;
-
-	return val;
-}
-
-int fdt_size_cells(const void *fdt, int nodeoffset)
-{
-	const fdt32_t *sc;
-	int val;
-	int len;
-
-	sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len);
-	if (!sc)
-		return 2;
-
-	if (len != sizeof(*sc))
-		return -FDT_ERR_BADNCELLS;
-
-	val = fdt32_to_cpu(*sc);
-	if ((val < 0) || (val > FDT_MAX_NCELLS))
-		return -FDT_ERR_BADNCELLS;
-
-	return val;
-}
+#include <linux/libfdt_env.h>
+#include "../../scripts/dtc/libfdt/fdt_addresses.c"
diff --git a/lib/libfdt/fdt_empty_tree.c b/lib/libfdt/fdt_empty_tree.c
index 6fde1eb9ed..2b4ae1062b 100644
--- a/lib/libfdt/fdt_empty_tree.c
+++ b/lib/libfdt/fdt_empty_tree.c
@@ -1,37 +1,2 @@
-/*
- * libfdt - Flat Device Tree manipulation
- * Copyright (C) 2012 David Gibson, IBM Corporation.
- * SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause
- */
-#include <libfdt_env.h>
-#include <fdt.h>
-#include <libfdt.h>
-
-#include "libfdt_internal.h"
-
-int fdt_create_empty_tree(void *buf, int bufsize)
-{
-	int err;
-
-	err = fdt_create(buf, bufsize);
-	if (err)
-		return err;
-
-	err = fdt_finish_reservemap(buf);
-	if (err)
-		return err;
-
-	err = fdt_begin_node(buf, "");
-	if (err)
-		return err;
-
-	err =  fdt_end_node(buf);
-	if (err)
-		return err;
-
-	err = fdt_finish(buf);
-	if (err)
-		return err;
-
-	return fdt_open_into(buf, buf, bufsize);
-}
+#include <linux/libfdt_env.h>
+#include "../../scripts/dtc/libfdt/fdt_empty_tree.c"
diff --git a/lib/libfdt/fdt_overlay.c b/lib/libfdt/fdt_overlay.c
index bd81241e66..575c827673 100644
--- a/lib/libfdt/fdt_overlay.c
+++ b/lib/libfdt/fdt_overlay.c
@@ -1,861 +1,2 @@
-#include "libfdt_env.h"
-
-#include <fdt.h>
-#include <libfdt.h>
-
-#include "libfdt_internal.h"
-
-/**
- * overlay_get_target_phandle - retrieves the target phandle of a fragment
- * @fdto: pointer to the device tree overlay blob
- * @fragment: node offset of the fragment in the overlay
- *
- * overlay_get_target_phandle() retrieves the target phandle of an
- * overlay fragment when that fragment uses a phandle (target
- * property) instead of a path (target-path property).
- *
- * returns:
- *      the phandle pointed by the target property
- *      0, if the phandle was not found
- *	-1, if the phandle was malformed
- */
-static uint32_t overlay_get_target_phandle(const void *fdto, int fragment)
-{
-	const fdt32_t *val;
-	int len;
-
-	val = fdt_getprop(fdto, fragment, "target", &len);
-	if (!val)
-		return 0;
-
-	if ((len != sizeof(*val)) || (fdt32_to_cpu(*val) == (uint32_t)-1))
-		return (uint32_t)-1;
-
-	return fdt32_to_cpu(*val);
-}
-
-/**
- * overlay_get_target - retrieves the offset of a fragment's target
- * @fdt: Base device tree blob
- * @fdto: Device tree overlay blob
- * @fragment: node offset of the fragment in the overlay
- * @pathp: pointer which receives the path of the target (or NULL)
- *
- * overlay_get_target() retrieves the target offset in the base
- * device tree of a fragment, no matter how the actual targetting is
- * done (through a phandle or a path)
- *
- * returns:
- *      the targetted node offset in the base device tree
- *      Negative error code on error
- */
-static int overlay_get_target(const void *fdt, const void *fdto,
-			      int fragment, char const **pathp)
-{
-	uint32_t phandle;
-	const char *path = NULL;
-	int path_len = 0, ret;
-
-	/* Try first to do a phandle based lookup */
-	phandle = overlay_get_target_phandle(fdto, fragment);
-	if (phandle == (uint32_t)-1)
-		return -FDT_ERR_BADPHANDLE;
-
-	/* no phandle, try path */
-	if (!phandle) {
-		/* And then a path based lookup */
-		path = fdt_getprop(fdto, fragment, "target-path", &path_len);
-		if (path)
-			ret = fdt_path_offset(fdt, path);
-		else
-			ret = path_len;
-	} else
-		ret = fdt_node_offset_by_phandle(fdt, phandle);
-
-	/*
-	* If we haven't found either a target or a
-	* target-path property in a node that contains a
-	* __overlay__ subnode (we wouldn't be called
-	* otherwise), consider it a improperly written
-	* overlay
-	*/
-	if (ret < 0 && path_len == -FDT_ERR_NOTFOUND)
-		ret = -FDT_ERR_BADOVERLAY;
-
-	/* return on error */
-	if (ret < 0)
-		return ret;
-
-	/* return pointer to path (if available) */
-	if (pathp)
-		*pathp = path ? path : NULL;
-
-	return ret;
-}
-
-/**
- * overlay_phandle_add_offset - Increases a phandle by an offset
- * @fdt: Base device tree blob
- * @node: Device tree overlay blob
- * @name: Name of the property to modify (phandle or linux,phandle)
- * @delta: offset to apply
- *
- * overlay_phandle_add_offset() increments a node phandle by a given
- * offset.
- *
- * returns:
- *      0 on success.
- *      Negative error code on error
- */
-static int overlay_phandle_add_offset(void *fdt, int node,
-				      const char *name, uint32_t delta)
-{
-	const fdt32_t *val;
-	uint32_t adj_val;
-	int len;
-
-	val = fdt_getprop(fdt, node, name, &len);
-	if (!val)
-		return len;
-
-	if (len != sizeof(*val))
-		return -FDT_ERR_BADPHANDLE;
-
-	adj_val = fdt32_to_cpu(*val);
-	if ((adj_val + delta) < adj_val)
-		return -FDT_ERR_NOPHANDLES;
-
-	adj_val += delta;
-	if (adj_val == (uint32_t)-1)
-		return -FDT_ERR_NOPHANDLES;
-
-	return fdt_setprop_inplace_u32(fdt, node, name, adj_val);
-}
-
-/**
- * overlay_adjust_node_phandles - Offsets the phandles of a node
- * @fdto: Device tree overlay blob
- * @node: Offset of the node we want to adjust
- * @delta: Offset to shift the phandles of
- *
- * overlay_adjust_node_phandles() adds a constant to all the phandles
- * of a given node. This is mainly use as part of the overlay
- * application process, when we want to update all the overlay
- * phandles to not conflict with the overlays of the base device tree.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_adjust_node_phandles(void *fdto, int node,
-					uint32_t delta)
-{
-	int child;
-	int ret;
-
-	ret = overlay_phandle_add_offset(fdto, node, "phandle", delta);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		return ret;
-
-	ret = overlay_phandle_add_offset(fdto, node, "linux,phandle", delta);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		return ret;
-
-	fdt_for_each_subnode(child, fdto, node) {
-		ret = overlay_adjust_node_phandles(fdto, child, delta);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-/**
- * overlay_adjust_local_phandles - Adjust the phandles of a whole overlay
- * @fdto: Device tree overlay blob
- * @delta: Offset to shift the phandles of
- *
- * overlay_adjust_local_phandles() adds a constant to all the
- * phandles of an overlay. This is mainly use as part of the overlay
- * application process, when we want to update all the overlay
- * phandles to not conflict with the overlays of the base device tree.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_adjust_local_phandles(void *fdto, uint32_t delta)
-{
-	/*
-	 * Start adjusting the phandles from the overlay root
-	 */
-	return overlay_adjust_node_phandles(fdto, 0, delta);
-}
-
-/**
- * overlay_update_local_node_references - Adjust the overlay references
- * @fdto: Device tree overlay blob
- * @tree_node: Node offset of the node to operate on
- * @fixup_node: Node offset of the matching local fixups node
- * @delta: Offset to shift the phandles of
- *
- * overlay_update_local_nodes_references() update the phandles
- * pointing to a node within the device tree overlay by adding a
- * constant delta.
- *
- * This is mainly used as part of a device tree application process,
- * where you want the device tree overlays phandles to not conflict
- * with the ones from the base device tree before merging them.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_update_local_node_references(void *fdto,
-						int tree_node,
-						int fixup_node,
-						uint32_t delta)
-{
-	int fixup_prop;
-	int fixup_child;
-	int ret;
-
-	fdt_for_each_property_offset(fixup_prop, fdto, fixup_node) {
-		const fdt32_t *fixup_val;
-		const char *tree_val;
-		const char *name;
-		int fixup_len;
-		int tree_len;
-		int i;
-
-		fixup_val = fdt_getprop_by_offset(fdto, fixup_prop,
-						  &name, &fixup_len);
-		if (!fixup_val)
-			return fixup_len;
-
-		if (fixup_len % sizeof(uint32_t))
-			return -FDT_ERR_BADOVERLAY;
-
-		tree_val = fdt_getprop(fdto, tree_node, name, &tree_len);
-		if (!tree_val) {
-			if (tree_len == -FDT_ERR_NOTFOUND)
-				return -FDT_ERR_BADOVERLAY;
-
-			return tree_len;
-		}
-
-		for (i = 0; i < (fixup_len / sizeof(uint32_t)); i++) {
-			fdt32_t adj_val;
-			uint32_t poffset;
-
-			poffset = fdt32_to_cpu(fixup_val[i]);
-
-			/*
-			 * phandles to fixup can be unaligned.
-			 *
-			 * Use a memcpy for the architectures that do
-			 * not support unaligned accesses.
-			 */
-			memcpy(&adj_val, tree_val + poffset, sizeof(adj_val));
-
-			adj_val = cpu_to_fdt32(fdt32_to_cpu(adj_val) + delta);
-
-			ret = fdt_setprop_inplace_namelen_partial(fdto,
-								  tree_node,
-								  name,
-								  strlen(name),
-								  poffset,
-								  &adj_val,
-								  sizeof(adj_val));
-			if (ret == -FDT_ERR_NOSPACE)
-				return -FDT_ERR_BADOVERLAY;
-
-			if (ret)
-				return ret;
-		}
-	}
-
-	fdt_for_each_subnode(fixup_child, fdto, fixup_node) {
-		const char *fixup_child_name = fdt_get_name(fdto, fixup_child,
-							    NULL);
-		int tree_child;
-
-		tree_child = fdt_subnode_offset(fdto, tree_node,
-						fixup_child_name);
-		if (tree_child == -FDT_ERR_NOTFOUND)
-			return -FDT_ERR_BADOVERLAY;
-		if (tree_child < 0)
-			return tree_child;
-
-		ret = overlay_update_local_node_references(fdto,
-							   tree_child,
-							   fixup_child,
-							   delta);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-/**
- * overlay_update_local_references - Adjust the overlay references
- * @fdto: Device tree overlay blob
- * @delta: Offset to shift the phandles of
- *
- * overlay_update_local_references() update all the phandles pointing
- * to a node within the device tree overlay by adding a constant
- * delta to not conflict with the base overlay.
- *
- * This is mainly used as part of a device tree application process,
- * where you want the device tree overlays phandles to not conflict
- * with the ones from the base device tree before merging them.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_update_local_references(void *fdto, uint32_t delta)
-{
-	int fixups;
-
-	fixups = fdt_path_offset(fdto, "/__local_fixups__");
-	if (fixups < 0) {
-		/* There's no local phandles to adjust, bail out */
-		if (fixups == -FDT_ERR_NOTFOUND)
-			return 0;
-
-		return fixups;
-	}
-
-	/*
-	 * Update our local references from the root of the tree
-	 */
-	return overlay_update_local_node_references(fdto, 0, fixups,
-						    delta);
-}
-
-/**
- * overlay_fixup_one_phandle - Set an overlay phandle to the base one
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- * @symbols_off: Node offset of the symbols node in the base device tree
- * @path: Path to a node holding a phandle in the overlay
- * @path_len: number of path characters to consider
- * @name: Name of the property holding the phandle reference in the overlay
- * @name_len: number of name characters to consider
- * @poffset: Offset within the overlay property where the phandle is stored
- * @label: Label of the node referenced by the phandle
- *
- * overlay_fixup_one_phandle() resolves an overlay phandle pointing to
- * a node in the base device tree.
- *
- * This is part of the device tree overlay application process, when
- * you want all the phandles in the overlay to point to the actual
- * base dt nodes.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_fixup_one_phandle(void *fdt, void *fdto,
-				     int symbols_off,
-				     const char *path, uint32_t path_len,
-				     const char *name, uint32_t name_len,
-				     int poffset, const char *label)
-{
-	const char *symbol_path;
-	uint32_t phandle;
-	fdt32_t phandle_prop;
-	int symbol_off, fixup_off;
-	int prop_len;
-
-	if (symbols_off < 0)
-		return symbols_off;
-
-	symbol_path = fdt_getprop(fdt, symbols_off, label,
-				  &prop_len);
-	if (!symbol_path)
-		return prop_len;
-
-	symbol_off = fdt_path_offset(fdt, symbol_path);
-	if (symbol_off < 0)
-		return symbol_off;
-
-	phandle = fdt_get_phandle(fdt, symbol_off);
-	if (!phandle)
-		return -FDT_ERR_NOTFOUND;
-
-	fixup_off = fdt_path_offset_namelen(fdto, path, path_len);
-	if (fixup_off == -FDT_ERR_NOTFOUND)
-		return -FDT_ERR_BADOVERLAY;
-	if (fixup_off < 0)
-		return fixup_off;
-
-	phandle_prop = cpu_to_fdt32(phandle);
-	return fdt_setprop_inplace_namelen_partial(fdto, fixup_off,
-						   name, name_len, poffset,
-						   &phandle_prop,
-						   sizeof(phandle_prop));
-};
-
-/**
- * overlay_fixup_phandle - Set an overlay phandle to the base one
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- * @symbols_off: Node offset of the symbols node in the base device tree
- * @property: Property offset in the overlay holding the list of fixups
- *
- * overlay_fixup_phandle() resolves all the overlay phandles pointed
- * to in a __fixups__ property, and updates them to match the phandles
- * in use in the base device tree.
- *
- * This is part of the device tree overlay application process, when
- * you want all the phandles in the overlay to point to the actual
- * base dt nodes.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_fixup_phandle(void *fdt, void *fdto, int symbols_off,
-				 int property)
-{
-	const char *value;
-	const char *label;
-	int len;
-
-	value = fdt_getprop_by_offset(fdto, property,
-				      &label, &len);
-	if (!value) {
-		if (len == -FDT_ERR_NOTFOUND)
-			return -FDT_ERR_INTERNAL;
-
-		return len;
-	}
-
-	do {
-		const char *path, *name, *fixup_end;
-		const char *fixup_str = value;
-		uint32_t path_len, name_len;
-		uint32_t fixup_len;
-		char *sep, *endptr;
-		int poffset, ret;
-
-		fixup_end = memchr(value, '\0', len);
-		if (!fixup_end)
-			return -FDT_ERR_BADOVERLAY;
-		fixup_len = fixup_end - fixup_str;
-
-		len -= fixup_len + 1;
-		value += fixup_len + 1;
-
-		path = fixup_str;
-		sep = memchr(fixup_str, ':', fixup_len);
-		if (!sep || *sep != ':')
-			return -FDT_ERR_BADOVERLAY;
-
-		path_len = sep - path;
-		if (path_len == (fixup_len - 1))
-			return -FDT_ERR_BADOVERLAY;
-
-		fixup_len -= path_len + 1;
-		name = sep + 1;
-		sep = memchr(name, ':', fixup_len);
-		if (!sep || *sep != ':')
-			return -FDT_ERR_BADOVERLAY;
-
-		name_len = sep - name;
-		if (!name_len)
-			return -FDT_ERR_BADOVERLAY;
-
-		poffset = strtoul(sep + 1, &endptr, 10);
-		if ((*endptr != '\0') || (endptr <= (sep + 1)))
-			return -FDT_ERR_BADOVERLAY;
-
-		ret = overlay_fixup_one_phandle(fdt, fdto, symbols_off,
-						path, path_len, name, name_len,
-						poffset, label);
-		if (ret)
-			return ret;
-	} while (len > 0);
-
-	return 0;
-}
-
-/**
- * overlay_fixup_phandles - Resolve the overlay phandles to the base
- *                          device tree
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- *
- * overlay_fixup_phandles() resolves all the overlay phandles pointing
- * to nodes in the base device tree.
- *
- * This is one of the steps of the device tree overlay application
- * process, when you want all the phandles in the overlay to point to
- * the actual base dt nodes.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_fixup_phandles(void *fdt, void *fdto)
-{
-	int fixups_off, symbols_off;
-	int property;
-
-	/* We can have overlays without any fixups */
-	fixups_off = fdt_path_offset(fdto, "/__fixups__");
-	if (fixups_off == -FDT_ERR_NOTFOUND)
-		return 0; /* nothing to do */
-	if (fixups_off < 0)
-		return fixups_off;
-
-	/* And base DTs without symbols */
-	symbols_off = fdt_path_offset(fdt, "/__symbols__");
-	if ((symbols_off < 0 && (symbols_off != -FDT_ERR_NOTFOUND)))
-		return symbols_off;
-
-	fdt_for_each_property_offset(property, fdto, fixups_off) {
-		int ret;
-
-		ret = overlay_fixup_phandle(fdt, fdto, symbols_off, property);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-/**
- * overlay_apply_node - Merges a node into the base device tree
- * @fdt: Base Device Tree blob
- * @target: Node offset in the base device tree to apply the fragment to
- * @fdto: Device tree overlay blob
- * @node: Node offset in the overlay holding the changes to merge
- *
- * overlay_apply_node() merges a node into a target base device tree
- * node pointed.
- *
- * This is part of the final step in the device tree overlay
- * application process, when all the phandles have been adjusted and
- * resolved and you just have to merge overlay into the base device
- * tree.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_apply_node(void *fdt, int target,
-			      void *fdto, int node)
-{
-	int property;
-	int subnode;
-
-	fdt_for_each_property_offset(property, fdto, node) {
-		const char *name;
-		const void *prop;
-		int prop_len;
-		int ret;
-
-		prop = fdt_getprop_by_offset(fdto, property, &name,
-					     &prop_len);
-		if (prop_len == -FDT_ERR_NOTFOUND)
-			return -FDT_ERR_INTERNAL;
-		if (prop_len < 0)
-			return prop_len;
-
-		ret = fdt_setprop(fdt, target, name, prop, prop_len);
-		if (ret)
-			return ret;
-	}
-
-	fdt_for_each_subnode(subnode, fdto, node) {
-		const char *name = fdt_get_name(fdto, subnode, NULL);
-		int nnode;
-		int ret;
-
-		nnode = fdt_add_subnode(fdt, target, name);
-		if (nnode == -FDT_ERR_EXISTS) {
-			nnode = fdt_subnode_offset(fdt, target, name);
-			if (nnode == -FDT_ERR_NOTFOUND)
-				return -FDT_ERR_INTERNAL;
-		}
-
-		if (nnode < 0)
-			return nnode;
-
-		ret = overlay_apply_node(fdt, nnode, fdto, subnode);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-/**
- * overlay_merge - Merge an overlay into its base device tree
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- *
- * overlay_merge() merges an overlay into its base device tree.
- *
- * This is the next to last step in the device tree overlay application
- * process, when all the phandles have been adjusted and resolved and
- * you just have to merge overlay into the base device tree.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_merge(void *fdt, void *fdto)
-{
-	int fragment;
-
-	fdt_for_each_subnode(fragment, fdto, 0) {
-		int overlay;
-		int target;
-		int ret;
-
-		/*
-		 * Each fragments will have an __overlay__ node. If
-		 * they don't, it's not supposed to be merged
-		 */
-		overlay = fdt_subnode_offset(fdto, fragment, "__overlay__");
-		if (overlay == -FDT_ERR_NOTFOUND)
-			continue;
-
-		if (overlay < 0)
-			return overlay;
-
-		target = overlay_get_target(fdt, fdto, fragment, NULL);
-		if (target < 0)
-			return target;
-
-		ret = overlay_apply_node(fdt, target, fdto, overlay);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
-static int get_path_len(const void *fdt, int nodeoffset)
-{
-	int len = 0, namelen;
-	const char *name;
-
-	FDT_CHECK_HEADER(fdt);
-
-	for (;;) {
-		name = fdt_get_name(fdt, nodeoffset, &namelen);
-		if (!name)
-			return namelen;
-
-		/* root? we're done */
-		if (namelen == 0)
-			break;
-
-		nodeoffset = fdt_parent_offset(fdt, nodeoffset);
-		if (nodeoffset < 0)
-			return nodeoffset;
-		len += namelen + 1;
-	}
-
-	/* in case of root pretend it's "/" */
-	if (len == 0)
-		len++;
-	return len;
-}
-
-/**
- * overlay_symbol_update - Update the symbols of base tree after a merge
- * @fdt: Base Device Tree blob
- * @fdto: Device tree overlay blob
- *
- * overlay_symbol_update() updates the symbols of the base tree with the
- * symbols of the applied overlay
- *
- * This is the last step in the device tree overlay application
- * process, allowing the reference of overlay symbols by subsequent
- * overlay operations.
- *
- * returns:
- *      0 on success
- *      Negative error code on failure
- */
-static int overlay_symbol_update(void *fdt, void *fdto)
-{
-	int root_sym, ov_sym, prop, path_len, fragment, target;
-	int len, frag_name_len, ret, rel_path_len;
-	const char *s, *e;
-	const char *path;
-	const char *name;
-	const char *frag_name;
-	const char *rel_path;
-	const char *target_path;
-	char *buf;
-	void *p;
-
-	ov_sym = fdt_subnode_offset(fdto, 0, "__symbols__");
-
-	/* if no overlay symbols exist no problem */
-	if (ov_sym < 0)
-		return 0;
-
-	root_sym = fdt_subnode_offset(fdt, 0, "__symbols__");
-
-	/* it no root symbols exist we should create them */
-	if (root_sym == -FDT_ERR_NOTFOUND)
-		root_sym = fdt_add_subnode(fdt, 0, "__symbols__");
-
-	/* any error is fatal now */
-	if (root_sym < 0)
-		return root_sym;
-
-	/* iterate over each overlay symbol */
-	fdt_for_each_property_offset(prop, fdto, ov_sym) {
-		path = fdt_getprop_by_offset(fdto, prop, &name, &path_len);
-		if (!path)
-			return path_len;
-
-		/* verify it's a string property (terminated by a single \0) */
-		if (path_len < 1 || memchr(path, '\0', path_len) != &path[path_len - 1])
-			return -FDT_ERR_BADVALUE;
-
-		/* keep end marker to avoid strlen() */
-		e = path + path_len;
-
-		/* format: /<fragment-name>/__overlay__/<relative-subnode-path> */
-
-		if (*path != '/')
-			return -FDT_ERR_BADVALUE;
-
-		/* get fragment name first */
-		s = strchr(path + 1, '/');
-		if (!s)
-			return -FDT_ERR_BADOVERLAY;
-
-		frag_name = path + 1;
-		frag_name_len = s - path - 1;
-
-		/* verify format; safe since "s" lies in \0 terminated prop */
-		len = sizeof("/__overlay__/") - 1;
-		if ((e - s) < len || memcmp(s, "/__overlay__/", len))
-			return -FDT_ERR_BADOVERLAY;
-
-		rel_path = s + len;
-		rel_path_len = e - rel_path;
-
-		/* find the fragment index in which the symbol lies */
-		ret = fdt_subnode_offset_namelen(fdto, 0, frag_name,
-					       frag_name_len);
-		/* not found? */
-		if (ret < 0)
-			return -FDT_ERR_BADOVERLAY;
-		fragment = ret;
-
-		/* an __overlay__ subnode must exist */
-		ret = fdt_subnode_offset(fdto, fragment, "__overlay__");
-		if (ret < 0)
-			return -FDT_ERR_BADOVERLAY;
-
-		/* get the target of the fragment */
-		ret = overlay_get_target(fdt, fdto, fragment, &target_path);
-		if (ret < 0)
-			return ret;
-		target = ret;
-
-		/* if we have a target path use */
-		if (!target_path) {
-			ret = get_path_len(fdt, target);
-			if (ret < 0)
-				return ret;
-			len = ret;
-		} else {
-			len = strlen(target_path);
-		}
-
-		ret = fdt_setprop_placeholder(fdt, root_sym, name,
-				len + (len > 1) + rel_path_len + 1, &p);
-		if (ret < 0)
-			return ret;
-
-		if (!target_path) {
-			/* again in case setprop_placeholder changed it */
-			ret = overlay_get_target(fdt, fdto, fragment, &target_path);
-			if (ret < 0)
-				return ret;
-			target = ret;
-		}
-
-		buf = p;
-		if (len > 1) { /* target is not root */
-			if (!target_path) {
-				ret = fdt_get_path(fdt, target, buf, len + 1);
-				if (ret < 0)
-					return ret;
-			} else
-				memcpy(buf, target_path, len + 1);
-
-		} else
-			len--;
-
-		buf[len] = '/';
-		memcpy(buf + len + 1, rel_path, rel_path_len);
-		buf[len + 1 + rel_path_len] = '\0';
-	}
-
-	return 0;
-}
-
-int fdt_overlay_apply(void *fdt, void *fdto)
-{
-	uint32_t delta = fdt_get_max_phandle(fdt);
-	int ret;
-
-	FDT_CHECK_HEADER(fdt);
-	FDT_CHECK_HEADER(fdto);
-
-	ret = overlay_adjust_local_phandles(fdto, delta);
-	if (ret)
-		goto err;
-
-	ret = overlay_update_local_references(fdto, delta);
-	if (ret)
-		goto err;
-
-	ret = overlay_fixup_phandles(fdt, fdto);
-	if (ret)
-		goto err;
-
-	ret = overlay_merge(fdt, fdto);
-	if (ret)
-		goto err;
-
-	ret = overlay_symbol_update(fdt, fdto);
-	if (ret)
-		goto err;
-
-	/*
-	 * The overlay has been damaged, erase its magic.
-	 */
-	fdt_set_magic(fdto, ~0);
-
-	return 0;
-
-err:
-	/*
-	 * The overlay might have been damaged, erase its magic.
-	 */
-	fdt_set_magic(fdto, ~0);
-
-	/*
-	 * The base device tree might have been damaged, erase its
-	 * magic.
-	 */
-	fdt_set_magic(fdt, ~0);
-
-	return ret;
-}
+#include <linux/libfdt_env.h>
+#include "../../scripts/dtc/libfdt/fdt_overlay.c"
diff --git a/lib/libfdt/fdt_strerror.c b/lib/libfdt/fdt_strerror.c
index f89004c609..408a88328f 100644
--- a/lib/libfdt/fdt_strerror.c
+++ b/lib/libfdt/fdt_strerror.c
@@ -1,61 +1,2 @@
-/*
- * libfdt - Flat Device Tree manipulation
- * Copyright (C) 2006 David Gibson, IBM Corporation.
- * SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause
- */
-#include <libfdt_env.h>
-
-#ifndef USE_HOSTCC
-#include <fdt.h>
-#include <libfdt.h>
-#else
-#include "fdt_host.h"
-#endif
-
-#include "libfdt_internal.h"
-
-struct fdt_errtabent {
-	const char *str;
-};
-
-#define FDT_ERRTABENT(val) \
-	[(val)] = { .str = #val, }
-
-static struct fdt_errtabent fdt_errtable[] = {
-	FDT_ERRTABENT(FDT_ERR_NOTFOUND),
-	FDT_ERRTABENT(FDT_ERR_EXISTS),
-	FDT_ERRTABENT(FDT_ERR_NOSPACE),
-
-	FDT_ERRTABENT(FDT_ERR_BADOFFSET),
-	FDT_ERRTABENT(FDT_ERR_BADPATH),
-	FDT_ERRTABENT(FDT_ERR_BADPHANDLE),
-	FDT_ERRTABENT(FDT_ERR_BADSTATE),
-
-	FDT_ERRTABENT(FDT_ERR_TRUNCATED),
-	FDT_ERRTABENT(FDT_ERR_BADMAGIC),
-	FDT_ERRTABENT(FDT_ERR_BADVERSION),
-	FDT_ERRTABENT(FDT_ERR_BADSTRUCTURE),
-	FDT_ERRTABENT(FDT_ERR_BADLAYOUT),
-	FDT_ERRTABENT(FDT_ERR_INTERNAL),
-	FDT_ERRTABENT(FDT_ERR_BADNCELLS),
-	FDT_ERRTABENT(FDT_ERR_BADVALUE),
-	FDT_ERRTABENT(FDT_ERR_BADOVERLAY),
-	FDT_ERRTABENT(FDT_ERR_NOPHANDLES),
-};
-#define FDT_ERRTABSIZE	(sizeof(fdt_errtable) / sizeof(fdt_errtable[0]))
-
-const char *fdt_strerror(int errval)
-{
-	if (errval > 0)
-		return "<valid offset/length>";
-	else if (errval == 0)
-		return "<no error>";
-	else if (errval > -FDT_ERRTABSIZE) {
-		const char *s = fdt_errtable[-errval].str;
-
-		if (s)
-			return s;
-	}
-
-	return "<unknown error>";
-}
+#include <linux/libfdt_env.h>
+#include "../../scripts/dtc/libfdt/fdt_strerror.c"
diff --git a/lib/libfdt/fdt_sw.c b/lib/libfdt/fdt_sw.c
index 70fd026550..0da3ed92f3 100644
--- a/lib/libfdt/fdt_sw.c
+++ b/lib/libfdt/fdt_sw.c
@@ -1,254 +1,2 @@
-/*
- * libfdt - Flat Device Tree manipulation
- * Copyright (C) 2006 David Gibson, IBM Corporation.
- * SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause
- */
-#include <libfdt_env.h>
-#include <fdt.h>
-#include <libfdt.h>
-
-#include "libfdt_internal.h"
-
-static int _fdt_sw_check_header(void *fdt)
-{
-	if (fdt_magic(fdt) != FDT_SW_MAGIC)
-		return -FDT_ERR_BADMAGIC;
-	/* FIXME: should check more details about the header state */
-	return 0;
-}
-
-#define FDT_SW_CHECK_HEADER(fdt) \
-	{ \
-		int err; \
-		if ((err = _fdt_sw_check_header(fdt)) != 0) \
-			return err; \
-	}
-
-static void *_fdt_grab_space(void *fdt, size_t len)
-{
-	int offset = fdt_size_dt_struct(fdt);
-	int spaceleft;
-
-	spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
-		- fdt_size_dt_strings(fdt);
-
-	if ((offset + len < offset) || (offset + len > spaceleft))
-		return NULL;
-
-	fdt_set_size_dt_struct(fdt, offset + len);
-	return _fdt_offset_ptr_w(fdt, offset);
-}
-
-int fdt_create(void *buf, int bufsize)
-{
-	void *fdt = buf;
-
-	if (bufsize < sizeof(struct fdt_header))
-		return -FDT_ERR_NOSPACE;
-
-	memset(buf, 0, bufsize);
-
-	fdt_set_magic(fdt, FDT_SW_MAGIC);
-	fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
-	fdt_set_last_comp_version(fdt, FDT_FIRST_SUPPORTED_VERSION);
-	fdt_set_totalsize(fdt,  bufsize);
-
-	fdt_set_off_mem_rsvmap(fdt, FDT_ALIGN(sizeof(struct fdt_header),
-					      sizeof(struct fdt_reserve_entry)));
-	fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt));
-	fdt_set_off_dt_strings(fdt, bufsize);
-
-	return 0;
-}
-
-int fdt_resize(void *fdt, void *buf, int bufsize)
-{
-	size_t headsize, tailsize;
-	char *oldtail, *newtail;
-
-	FDT_SW_CHECK_HEADER(fdt);
-
-	headsize = fdt_off_dt_struct(fdt);
-	tailsize = fdt_size_dt_strings(fdt);
-
-	if ((headsize + tailsize) > bufsize)
-		return -FDT_ERR_NOSPACE;
-
-	oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize;
-	newtail = (char *)buf + bufsize - tailsize;
-
-	/* Two cases to avoid clobbering data if the old and new
-	 * buffers partially overlap */
-	if (buf <= fdt) {
-		memmove(buf, fdt, headsize);
-		memmove(newtail, oldtail, tailsize);
-	} else {
-		memmove(newtail, oldtail, tailsize);
-		memmove(buf, fdt, headsize);
-	}
-
-	fdt_set_off_dt_strings(buf, bufsize);
-	fdt_set_totalsize(buf, bufsize);
-
-	return 0;
-}
-
-int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
-{
-	struct fdt_reserve_entry *re;
-	int offset;
-
-	FDT_SW_CHECK_HEADER(fdt);
-
-	if (fdt_size_dt_struct(fdt))
-		return -FDT_ERR_BADSTATE;
-
-	offset = fdt_off_dt_struct(fdt);
-	if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
-		return -FDT_ERR_NOSPACE;
-
-	re = (struct fdt_reserve_entry *)((char *)fdt + offset);
-	re->address = cpu_to_fdt64(addr);
-	re->size = cpu_to_fdt64(size);
-
-	fdt_set_off_dt_struct(fdt, offset + sizeof(*re));
-
-	return 0;
-}
-
-int fdt_finish_reservemap(void *fdt)
-{
-	return fdt_add_reservemap_entry(fdt, 0, 0);
-}
-
-int fdt_begin_node(void *fdt, const char *name)
-{
-	struct fdt_node_header *nh;
-	int namelen = strlen(name) + 1;
-
-	FDT_SW_CHECK_HEADER(fdt);
-
-	nh = _fdt_grab_space(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen));
-	if (! nh)
-		return -FDT_ERR_NOSPACE;
-
-	nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
-	memcpy(nh->name, name, namelen);
-	return 0;
-}
-
-int fdt_end_node(void *fdt)
-{
-	fdt32_t *en;
-
-	FDT_SW_CHECK_HEADER(fdt);
-
-	en = _fdt_grab_space(fdt, FDT_TAGSIZE);
-	if (! en)
-		return -FDT_ERR_NOSPACE;
-
-	*en = cpu_to_fdt32(FDT_END_NODE);
-	return 0;
-}
-
-static int _fdt_find_add_string(void *fdt, const char *s)
-{
-	char *strtab = (char *)fdt + fdt_totalsize(fdt);
-	const char *p;
-	int strtabsize = fdt_size_dt_strings(fdt);
-	int len = strlen(s) + 1;
-	int struct_top, offset;
-
-	p = _fdt_find_string(strtab - strtabsize, strtabsize, s);
-	if (p)
-		return p - strtab;
-
-	/* Add it */
-	offset = -strtabsize - len;
-	struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
-	if (fdt_totalsize(fdt) + offset < struct_top)
-		return 0; /* no more room :( */
-
-	memcpy(strtab + offset, s, len);
-	fdt_set_size_dt_strings(fdt, strtabsize + len);
-	return offset;
-}
-
-int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp)
-{
-	struct fdt_property *prop;
-	int nameoff;
-
-	FDT_SW_CHECK_HEADER(fdt);
-
-	nameoff = _fdt_find_add_string(fdt, name);
-	if (nameoff == 0)
-		return -FDT_ERR_NOSPACE;
-
-	prop = _fdt_grab_space(fdt, sizeof(*prop) + FDT_TAGALIGN(len));
-	if (! prop)
-		return -FDT_ERR_NOSPACE;
-
-	prop->tag = cpu_to_fdt32(FDT_PROP);
-	prop->nameoff = cpu_to_fdt32(nameoff);
-	prop->len = cpu_to_fdt32(len);
-	*valp = prop->data;
-	return 0;
-}
-
-int fdt_property(void *fdt, const char *name, const void *val, int len)
-{
-	void *ptr;
-	int ret;
-
-	ret = fdt_property_placeholder(fdt, name, len, &ptr);
-	if (ret)
-		return ret;
-	memcpy(ptr, val, len);
-	return 0;
-}
-
-int fdt_finish(void *fdt)
-{
-	char *p = (char *)fdt;
-	fdt32_t *end;
-	int oldstroffset, newstroffset;
-	uint32_t tag;
-	int offset, nextoffset;
-
-	FDT_SW_CHECK_HEADER(fdt);
-
-	/* Add terminator */
-	end = _fdt_grab_space(fdt, sizeof(*end));
-	if (! end)
-		return -FDT_ERR_NOSPACE;
-	*end = cpu_to_fdt32(FDT_END);
-
-	/* Relocate the string table */
-	oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt);
-	newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
-	memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt));
-	fdt_set_off_dt_strings(fdt, newstroffset);
-
-	/* Walk the structure, correcting string offsets */
-	offset = 0;
-	while ((tag = fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) {
-		if (tag == FDT_PROP) {
-			struct fdt_property *prop =
-				_fdt_offset_ptr_w(fdt, offset);
-			int nameoff;
-
-			nameoff = fdt32_to_cpu(prop->nameoff);
-			nameoff += fdt_size_dt_strings(fdt);
-			prop->nameoff = cpu_to_fdt32(nameoff);
-		}
-		offset = nextoffset;
-	}
-	if (nextoffset < 0)
-		return nextoffset;
-
-	/* Finally, adjust the header */
-	fdt_set_totalsize(fdt, newstroffset + fdt_size_dt_strings(fdt));
-	fdt_set_magic(fdt, FDT_MAGIC);
-	return 0;
-}
+#include <linux/libfdt_env.h>
+#include "../../scripts/dtc/libfdt/fdt_sw.c"