From: Thierry Reding Date: Tue, 26 Aug 2014 15:33:55 +0000 (+0200) Subject: fdt: Add a subnodes iterator macro X-Git-Tag: v2015.01-rc1~207^2 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=2f3760428ff3c4d5d1a087d016da5943921f0980;p=u-boot fdt: Add a subnodes iterator macro 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. Acked-by: Simon Glass Signed-off-by: Thierry Reding --- diff --git a/include/libfdt.h b/include/libfdt.h index 2dfc6d9e5c..f3cbb637be 100644 --- a/include/libfdt.h +++ b/include/libfdt.h @@ -163,6 +163,31 @@ 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 + * ... + * } + * + * Note that this is implemented as a macro and node is used as iterator in + * the loop. It should therefore be a locally allocated variable. The parent + * variable on the other hand is never modified, so it can be constant or + * even a literal. + * + * @fdt: FDT blob (const void *) + * @node: child node (int) + * @parent: parent node (int) + */ +#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 */ /**********************************************************************/