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fdt: Add a function to get the node offset of an alias 

This simple function returns the node offset of a named alias.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-07-23 06:55:16 -06:00
parent c910e2e2da
commit 3234aa4bab
2 changed files with 26 additions and 0 deletions
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11
include/fdtdec.h
View File

@ -363,6 +363,17 @@ int fdtdec_add_aliases_for_id(const void *blob, const char *name,
int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
int *seqp);
/**
* Get the offset of the given alias node
*
* This looks up an alias in /aliases then finds the offset of that node.
*
* @param blob Device tree blob (if NULL, then error is returned)
* @param name Alias name, e.g. "console"
* @return Node offset referred to by that alias, or -ve FDT_ERR_...
*/
int fdtdec_get_alias_node(const void *blob, const char *name);
/*
* Get the name for a compatible ID
*

15
lib/fdtdec.c
View File

@ -365,6 +365,21 @@ int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
return -ENOENT;
}
int fdtdec_get_alias_node(const void *blob, const char *name)
{
const char *prop;
int alias_node;
int len;
if (!blob)
return -FDT_ERR_NOTFOUND;
alias_node = fdt_path_offset(blob, "/aliases");
prop = fdt_getprop(blob, alias_node, name, &len);
if (!prop)
return -FDT_ERR_NOTFOUND;
return fdt_path_offset(blob, prop);
}
int fdtdec_check_fdt(void)
{
/*