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-rw-r--r--include/libfdt.h16
-rw-r--r--lib/libfdt/fdt_sw.c16
2 files changed, 30 insertions, 2 deletions
diff --git a/include/libfdt.h b/include/libfdt.h
index e48c21aced0..74b1d149c2d 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -1181,6 +1181,22 @@ static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
{
return fdt_property_u32(fdt, name, val);
}
+
+/**
+ * fdt_property_placeholder - add a new property and return a ptr to its value
+ *
+ * @fdt: pointer to the device tree blob
+ * @name: name of property to add
+ * @len: length of property value in bytes
+ * @valp: returns a pointer to where where the value should be placed
+ *
+ * returns:
+ * 0, on success
+ * -FDT_ERR_BADMAGIC,
+ * -FDT_ERR_NOSPACE, standard meanings
+ */
+int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp);
+
#define fdt_property_string(fdt, name, str) \
fdt_property(fdt, name, str, strlen(str)+1)
int fdt_end_node(void *fdt);
diff --git a/lib/libfdt/fdt_sw.c b/lib/libfdt/fdt_sw.c
index 320a914991a..345a3acbf8e 100644
--- a/lib/libfdt/fdt_sw.c
+++ b/lib/libfdt/fdt_sw.c
@@ -175,7 +175,7 @@ static int _fdt_find_add_string(void *fdt, const char *s)
return offset;
}
-int fdt_property(void *fdt, const char *name, const void *val, int len)
+int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp)
{
struct fdt_property *prop;
int nameoff;
@@ -193,7 +193,19 @@ int fdt_property(void *fdt, const char *name, const void *val, int len)
prop->tag = cpu_to_fdt32(FDT_PROP);
prop->nameoff = cpu_to_fdt32(nameoff);
prop->len = cpu_to_fdt32(len);
- memcpy(prop->data, val, 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;
}