From 3ddecfc74086aa185a2f671cc07cb826b72d35f0 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Mon, 2 Apr 2012 13:18:42 +0000 Subject: 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 Signed-off-by: Tom Warren --- include/fdtdec.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'include') diff --git a/include/fdtdec.h b/include/fdtdec.h index 84f0768526..0351a25a98 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -116,6 +116,23 @@ int fdtdec_next_alias(const void *blob, const char *name, int fdtdec_next_compatible(const void *blob, int node, 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 -- cgit