diff options
author | Thierry Reding <treding@nvidia.com> | 2014-08-26 17:33:55 +0200 |
---|---|---|
committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2014-10-11 01:07:23 +0200 |
commit | a7aa9c2365b6c8a6d87cef14874ba4afbdcbd764 (patch) | |
tree | d5efcaf1749d8661dd2e14ff11925137f08d9629 /include/libfdt.h | |
parent | 6cdbbe34d7e3a76048cfe06f6578ed2b6ea30376 (diff) |
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 <sjg@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'include/libfdt.h')
-rw-r--r-- | include/libfdt.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h index 2dfc6d9e5ce..f3cbb637be4 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 */ /**********************************************************************/ |