From: Thierry Reding treding@nvidia.com
The fdt_for_each_subnode() iterator macro provided by this patch can be used to iterate over a device tree node's subnodes. At each iteration a loop variable will be set to the next subnode.
Signed-off-by: Thierry Reding treding@nvidia.com --- include/libfdt.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/include/libfdt.h b/include/libfdt.h index 4d7fb2681669..0330d7a29a58 100644 --- a/include/libfdt.h +++ b/include/libfdt.h @@ -163,6 +163,26 @@ int fdt_first_subnode(const void *fdt, int offset); */ int fdt_next_subnode(const void *fdt, int offset);
+/** + * fdt_for_each_subnode - iterate over all subnodes of a parent + * + * This is actually a wrapper around a for loop and would be used like so: + * + * fdt_for_each_subnode(fdt, node, parent) { + * ... + * use node + * ... + * } + * + * @fdt: FDT blob + * @node: child node + * @parent: parent node + */ +#define fdt_for_each_subnode(fdt, node, parent) \ + for (node = fdt_first_subnode(fdt, parent); \ + node >= 0; \ + node = fdt_next_subnode(fdt, node)) + /**********************************************************************/ /* General functions */ /**********************************************************************/