libfdt: migrate fdt_rw.c to a wrapper of scripts/dtc/libfdt/fdt_rw.c
The only difference between scripts/dtc/libfdt/fdt_rw.c and
lib/libfdt/fdt_rw.c is fdt_remove_unused_strings().
It is only used by fdtgrep, so we do not need to compile it for U-Boot
image. Move it to tools/libfdt/fdw_rw.c so that lib/libfdt/fdt_rw.c
can be a wrapper of scripts/dtc/libfdt/fdt_rw.c.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/Makefile b/tools/Makefile
index b7d7d41..f8731e7 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -63,11 +63,11 @@
# The following files are synced with upstream DTC.
# Use synced versions from scripts/dtc/libfdt/.
-LIBFDT_SRCS_SYNCED := fdt.c fdt_wip.c fdt_sw.c fdt_strerror.c fdt_empty_tree.c \
- fdt_addresses.c fdt_overlay.c
+LIBFDT_SRCS_SYNCED := fdt.c fdt_wip.c fdt_sw.c fdt_rw.c \
+ fdt_strerror.c fdt_empty_tree.c fdt_addresses.c fdt_overlay.c
# The following files are locally modified for U-Boot (unfotunately).
# Use U-Boot own versions from lib/libfdt/.
-LIBFDT_SRCS_UNSYNCED := fdt_ro.c fdt_rw.c fdt_region.c
+LIBFDT_SRCS_UNSYNCED := fdt_ro.c fdt_region.c
LIBFDT_OBJS := $(addprefix libfdt/, $(patsubst %.c, %.o, $(LIBFDT_SRCS_SYNCED))) \
$(addprefix lib/libfdt/, $(patsubst %.c, %.o, $(LIBFDT_SRCS_UNSYNCED)))
diff --git a/tools/fdt_host.h b/tools/fdt_host.h
index 134d965..8d4aa06 100644
--- a/tools/fdt_host.h
+++ b/tools/fdt_host.h
@@ -11,6 +11,23 @@
#include "../include/libfdt.h"
#include "../include/fdt_support.h"
+/**
+ * fdt_remove_unused_strings() - Remove any unused strings from an FDT
+ *
+ * This creates a new device tree in @new with unused strings removed. The
+ * called can then use fdt_pack() to minimise the space consumed.
+ *
+ * @old: Old device tree blog
+ * @new: Place to put new device tree blob, which must be as large as
+ * @old
+ * @return
+ * 0, on success
+ * -FDT_ERR_BADOFFSET, corrupt device tree
+ * -FDT_ERR_NOSPACE, out of space, which should not happen unless there
+ * is something very wrong with the device tree input
+ */
+int fdt_remove_unused_strings(const void *old, void *new);
+
int fit_check_sign(const void *working_fdt, const void *key);
#endif /* __FDT_HOST_H__ */
diff --git a/tools/fdtgrep.c b/tools/fdtgrep.c
index 5897b6d..7af77b7 100644
--- a/tools/fdtgrep.c
+++ b/tools/fdtgrep.c
@@ -16,7 +16,7 @@
#include <string.h>
#include <unistd.h>
-#include "../include/libfdt.h"
+#include "fdt_host.h"
#include "libfdt_internal.h"
/* Define DEBUG to get some debugging output on stderr */
diff --git a/tools/libfdt/fdt_rw.c b/tools/libfdt/fdt_rw.c
new file mode 100644
index 0000000..e475084
--- /dev/null
+++ b/tools/libfdt/fdt_rw.c
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause */
+#include "fdt_host.h"
+#include "../../scripts/dtc/libfdt/fdt_rw.c"
+
+int fdt_remove_unused_strings(const void *old, void *new)
+{
+ const struct fdt_property *old_prop;
+ struct fdt_property *new_prop;
+ int size = fdt_totalsize(old);
+ int next_offset, offset;
+ const char *str;
+ int ret;
+ int tag = FDT_PROP;
+
+ /* Make a copy and remove the strings */
+ memcpy(new, old, size);
+ fdt_set_size_dt_strings(new, 0);
+
+ /* Add every property name back into the new string table */
+ for (offset = 0; tag != FDT_END; offset = next_offset) {
+ tag = fdt_next_tag(old, offset, &next_offset);
+ if (tag != FDT_PROP)
+ continue;
+ old_prop = fdt_get_property_by_offset(old, offset, NULL);
+ new_prop = (struct fdt_property *)(unsigned long)
+ fdt_get_property_by_offset(new, offset, NULL);
+ str = fdt_string(old, fdt32_to_cpu(old_prop->nameoff));
+ ret = _fdt_find_add_string(new, str);
+ if (ret < 0)
+ return ret;
+ new_prop->nameoff = cpu_to_fdt32(ret);
+ }
+
+ return 0;
+}