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>
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@ -163,6 +163,31 @@ int fdt_first_subnode(const void *fdt, int offset);
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*/
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*/
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int fdt_next_subnode(const void *fdt, int offset);
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int fdt_next_subnode(const void *fdt, int offset);
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/**
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* fdt_for_each_subnode - iterate over all subnodes of a parent
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*
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* This is actually a wrapper around a for loop and would be used like so:
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*
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* fdt_for_each_subnode(fdt, node, parent) {
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* ...
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* use node
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* ...
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* }
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*
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* Note that this is implemented as a macro and node is used as iterator in
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* the loop. It should therefore be a locally allocated variable. The parent
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* variable on the other hand is never modified, so it can be constant or
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* even a literal.
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*
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* @fdt: FDT blob (const void *)
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* @node: child node (int)
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* @parent: parent node (int)
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*/
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#define fdt_for_each_subnode(fdt, node, parent) \
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for (node = fdt_first_subnode(fdt, parent); \
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node >= 0; \
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node = fdt_next_subnode(fdt, node))
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/**********************************************************************/
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/**********************************************************************/
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/* General functions */
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/* General functions */
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/**********************************************************************/
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/**********************************************************************/
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