From: Grant Likely grant.likely@secretlab.ca
Given the path to a node, fdt_find_and_setprop() allows a property value to be set directly.
Signed-off-by: Grant Likely grant.likely@secretlab.ca ---
include/libfdt.h | 2 ++ libfdt/fdt_rw.c | 26 ++++++++++++++++++++++++++ 2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/include/libfdt.h b/include/libfdt.h index 340e89d..38c65a9 100644 --- a/include/libfdt.h +++ b/include/libfdt.h @@ -140,6 +140,8 @@ int fdt_setprop(void *fdt, int nodeoffset, const char *name, }) #define fdt_setprop_string(fdt, nodeoffset, name, str) \ fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1) +int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, + const void *val, int len, int create); int fdt_delprop(void *fdt, int nodeoffset, const char *name); int fdt_add_subnode_namelen(void *fdt, int parentoffset, const char *name, int namelen); diff --git a/libfdt/fdt_rw.c b/libfdt/fdt_rw.c index 693bfe4..55fcc41 100644 --- a/libfdt/fdt_rw.c +++ b/libfdt/fdt_rw.c @@ -188,6 +188,32 @@ int fdt_setprop(void *fdt, int nodeoffset, const char *name, return 0; }
+/** + * fdt_find_and_setprop: Find a node and set it's property + * + * @fdt: ptr to device tree + * @node: path of node + * @prop: property name + * @val: ptr to new value + * @len: length of new property value + * @create: flag to create the property if it doesn't exist + * + * Convenience function to directly set a property given the path to the node. + */ +int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, + const void *val, int len, int create) +{ + int nodeoff = fdt_find_node_by_path(fdt, node); + + if (nodeoff < 0) + return nodeoff; + + if ((!create) && (fdt_get_property(fdt, nodeoff, prop, 0) == NULL)) + return 0; /* create flag not set; so exit quietly */ + + return fdt_setprop(fdt, nodeoff, prop, val, len); +} + int fdt_delprop(void *fdt, int nodeoffset, const char *name) { struct fdt_property *prop;