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fdt: Add a subnodes iterator macro

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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>
This commit is contained in:
Thierry Reding 2014-08-26 17:33:55 +02:00 committed by Simon Glass
parent 9f85eee72a
commit 2f3760428f
1 changed files with 25 additions and 0 deletions
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25
include/libfdt.h
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@ -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 */
/**********************************************************************/