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fdt: Add function to return next compatible subnode

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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>
This commit is contained in:
Simon Glass 2012-04-02 13:18:42 +00:00 • committed by Albert ARIBAUD
parent 96875e7d3b
commit 3ddecfc740
2 changed files with 32 additions and 0 deletions
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17
include/fdtdec.h
View file

@ -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

15
lib/fdtdec.c
View file

@ -133,6 +133,21 @@ int fdtdec_next_compatible(const void *blob, int node,
return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
}
int fdtdec_next_compatible_subnode(const void *blob, int node,
enum fdt_compat_id id, int *depthp)
{
do {
node = fdt_next_node(blob, node, depthp);
} while (*depthp > 1);
/* If this is a direct subnode, and compatible, return it */
if (*depthp == 1 && 0 == fdt_node_check_compatible(
blob, node, compat_names[id]))
return node;
return -FDT_ERR_NOTFOUND;
}
int fdtdec_next_alias(const void *blob, const char *name,
enum fdt_compat_id id, int *upto)
{