It is sometimes useful to find a property in the chosen node. Add a function for this.
Signed-off-by: Simon Glass sjg@chromium.org ---
include/fdtdec.h | 11 ++++++++++- lib/fdtdec.c | 15 ++++++++++----- 2 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/include/fdtdec.h b/include/fdtdec.h index 0cb6fa0..2049d12 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -534,7 +534,16 @@ int fdtdec_get_alias_seq(const void *blob, const char *base, int node, int *seqp);
/** - * Get the offset of the given chosen node + * Get a property from the /chosen node + * + * @param blob Device tree blob (if NULL, then NULL is returned) + * @param name Property name to look up + * @return Value of property, or NULL if it does not exist + */ +const char *fdtdec_get_chosen_prop(const void *blob, const char *name); + +/** + * Get the offset of the given /chosen node * * This looks up a property in /chosen containing the path to another node, * then finds the offset of that node. diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 81b54f8..38888de 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -529,16 +529,21 @@ int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, return -ENOENT; }
-int fdtdec_get_chosen_node(const void *blob, const char *name) +const char *fdtdec_get_chosen_prop(const void *blob, const char *name) { - const char *prop; int chosen_node; - int len;
if (!blob) - return -FDT_ERR_NOTFOUND; + return NULL; chosen_node = fdt_path_offset(blob, "/chosen"); - prop = fdt_getprop(blob, chosen_node, name, &len); + return fdt_getprop(blob, chosen_node, name, NULL); +} + +int fdtdec_get_chosen_node(const void *blob, const char *name) +{ + const char *prop; + + prop = fdtdec_get_chosen_prop(blob, name); if (!prop) return -FDT_ERR_NOTFOUND; return fdt_path_offset(blob, prop);