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of/promtree: add package-to-path support to pdt

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package-to-path is a PROM function which tells us the real (full) name of the
node.  This provides a hook for that in the prom ops struct, and makes use
of it in the pdt code when attempting to determine a node's name.  If the
hook is available, try using it (falling back to looking at the "name"
property if it fails).

Signed-off-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Andres Salomon 2010-10-10 21:52:57 -06:00 • committed by Grant Likely
commit e2f2a93b63
2 changed files with 45 additions and 1 deletions
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43
drivers/of/pdt.c
View file

@ -132,6 +132,47 @@ static char * __init of_pdt_get_one_property(phandle node, const char *name)
return buf;
}
static char * __init of_pdt_try_pkg2path(phandle node)
{
char *res, *buf = NULL;
int len;
if (!of_pdt_prom_ops->pkg2path)
return NULL;
if (of_pdt_prom_ops->pkg2path(node, buf, 0, &len))
return NULL;
buf = prom_early_alloc(len + 1);
if (of_pdt_prom_ops->pkg2path(node, buf, len, &len)) {
pr_err("%s: package-to-path failed\n", __func__);
return NULL;
}
res = strrchr(buf, '/');
if (!res) {
pr_err("%s: couldn't find / in %s\n", __func__, buf);
return NULL;
}
return res+1;
}
/*
* When fetching the node's name, first try using package-to-path; if
* that fails (either because the arch hasn't supplied a PROM callback,
* or some other random failure), fall back to just looking at the node's
* 'name' property.
*/
static char * __init of_pdt_build_name(phandle node)
{
char *buf;
buf = of_pdt_try_pkg2path(node);
if (!buf)
buf = of_pdt_get_one_property(node, "name");
return buf;
}
static struct device_node * __init of_pdt_create_node(phandle node,
struct device_node *parent)
{
@ -146,7 +187,7 @@ static struct device_node * __init of_pdt_create_node(phandle node,
kref_init(&dp->kref);
dp->name = of_pdt_get_one_property(node, "name");
dp->name = of_pdt_build_name(node);
dp->type = of_pdt_get_one_property(node, "device_type");
dp->phandle = node;

3
include/linux/of_pdt.h
View file

@ -29,6 +29,9 @@ struct of_pdt_ops {
/* phandles are 0 if no child or sibling exists */
phandle (*getchild)(phandle parent);
phandle (*getsibling)(phandle node);
/* return 0 on success; fill in 'len' with number of bytes in path */
int (*pkg2path)(phandle node, char *buf, const int buflen, int *len);
};
extern void *prom_early_alloc(unsigned long size);