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authorThierry Reding <treding@nvidia.com>2014-08-26 17:33:55 +0200
committerSimon Glass <sjg@chromium.org>2014-10-22 16:56:41 -0600
commit2f3760428ff3c4d5d1a087d016da5943921f0980 (patch)
treece1382fa8e07746b958d85db78910c64b48a1c7b
parent9f85eee72a2a3918b2d5cd7b1bf88da69232dede (diff)
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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>
-rw-r--r--include/libfdt.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h
index 2dfc6d9..f3cbb63 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 */
/**********************************************************************/