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dm: fdt: Add a function to look up a chosen node

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Within /chosen we may have a node which points to another node, similar
to how /aliases works. Add a helper function to do this lookup.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-09-04 16:27:24 -06:00
parent addf9513d0
commit aac07d49d0
2 changed files with 27 additions and 0 deletions
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12
include/fdtdec.h
View file

@ -374,6 +374,18 @@ int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
*/ */
int fdtdec_get_alias_node(const void *blob, const char *name); int fdtdec_get_alias_node(const void *blob, const char *name);
/**
* Get the offset of the given chosen node
*
* This looks up a property in /chosen containing the path to another node,
* then finds the offset of that node.
*
* @param blob Device tree blob (if NULL, then error is returned)
* @param name Property name, e.g. "stdout-path"
* @return Node offset referred to by that chosen node, or -ve FDT_ERR_...
*/
int fdtdec_get_chosen_node(const void *blob, const char *name);
/* /*
* Get the name for a compatible ID * Get the name for a compatible ID
* *

15
lib/fdtdec.c
View file

@ -380,6 +380,21 @@ int fdtdec_get_alias_node(const void *blob, const char *name)
return fdt_path_offset(blob, prop); return fdt_path_offset(blob, prop);
} }
int fdtdec_get_chosen_node(const void *blob, const char *name)
{
const char *prop;
int chosen_node;
int len;
if (!blob)
return -FDT_ERR_NOTFOUND;
chosen_node = fdt_path_offset(blob, "/chosen");
prop = fdt_getprop(blob, chosen_node, name, &len);
if (!prop)
return -FDT_ERR_NOTFOUND;
return fdt_path_offset(blob, prop);
}
int fdtdec_check_fdt(void) int fdtdec_check_fdt(void)
{ {
/* /*