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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>
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2 changed files with 32 additions and 0 deletions
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@ -116,6 +116,23 @@ int fdtdec_next_alias(const void *blob, const char *name,
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int fdtdec_next_compatible(const void *blob, int node,
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enum fdt_compat_id id);
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/**
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* Find the next compatible subnode for a peripheral.
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*
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* Do the first call with node set to the parent and depth = 0. This
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* function will return the offset of the next compatible node. Next time
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* you call this function, pass the node value returned last time, with
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* depth unchanged, and the next node will be provided.
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*
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* @param blob FDT blob to use
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* @param node Start node for search
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* @param id Compatible ID to look for (enum fdt_compat_id)
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* @param depthp Current depth (set to 0 before first call)
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* @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
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*/
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int fdtdec_next_compatible_subnode(const void *blob, int node,
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enum fdt_compat_id id, int *depthp);
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/**
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* Look up an address property in a node and return it as an address.
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* The property must hold either one address with no trailing data or
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15
lib/fdtdec.c
15
lib/fdtdec.c
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@ -133,6 +133,21 @@ int fdtdec_next_compatible(const void *blob, int node,
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return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
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}
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int fdtdec_next_compatible_subnode(const void *blob, int node,
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enum fdt_compat_id id, int *depthp)
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{
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do {
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node = fdt_next_node(blob, node, depthp);
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} while (*depthp > 1);
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/* If this is a direct subnode, and compatible, return it */
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if (*depthp == 1 && 0 == fdt_node_check_compatible(
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blob, node, compat_names[id]))
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return node;
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return -FDT_ERR_NOTFOUND;
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}
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int fdtdec_next_alias(const void *blob, const char *name,
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enum fdt_compat_id id, int *upto)
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{
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