fdt: Add function to return next compatible subnode
We need to iterate through subnodes of a parent, looking only at
compatible nodes. Add a utility function to do this for us.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 84f0768..0351a25 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -117,6 +117,23 @@
enum fdt_compat_id id);
/**
+ * Find the next compatible subnode for a peripheral.
+ *
+ * Do the first call with node set to the parent and depth = 0. This
+ * function will return the offset of the next compatible node. Next time
+ * you call this function, pass the node value returned last time, with
+ * depth unchanged, and the next node will be provided.
+ *
+ * @param blob FDT blob to use
+ * @param node Start node for search
+ * @param id Compatible ID to look for (enum fdt_compat_id)
+ * @param depthp Current depth (set to 0 before first call)
+ * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
+ */
+int fdtdec_next_compatible_subnode(const void *blob, int node,
+ enum fdt_compat_id id, int *depthp);
+
+/**
* Look up an address property in a node and return it as an address.
* The property must hold either one address with no trailing data or
* one address with a length. This is only tested on 32-bit machines.