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dm: of_access: add of_alias_get_dev() and of_alias_dump() 

- support get device_node by given stem and alias id;
 - dump of alias nodes added in aliases_lookup.

Change-Id: I3ed8bd4692dd3fbbeebe9978a797a5a2dcf7eb23
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
This commit is contained in:
Joseph Chen 2018-10-09 19:40:28 +08:00 committed by Jianhong Chen
parent ebdb223312
commit 2e02c4e25b
2 changed files with 52 additions and 0 deletions
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36
drivers/core/of_access.c
View File

@ -766,6 +766,42 @@ int of_alias_get_id(const struct device_node *np, const char *stem)
return id;
}
struct device_node *of_alias_get_dev(const char *stem, int id)
{
struct alias_prop *app;
struct device_node *np = NULL;
mutex_lock(&of_mutex);
list_for_each_entry(app, &aliases_lookup, link) {
if (strcmp(app->stem, stem) != 0)
continue;
if (id == app->id) {
np = app->np;
break;
}
}
mutex_unlock(&of_mutex);
return np;
}
struct device_node *of_alias_dump(void)
{
struct alias_prop *app;
struct device_node *np = NULL;
mutex_lock(&of_mutex);
list_for_each_entry(app, &aliases_lookup, link) {
printf("%s: Alias %s%d: %s, phandle=%d\n", __func__,
app->stem, app->id,
app->np->full_name, app->np->phandle);
}
mutex_unlock(&of_mutex);
return np;
}
struct device_node *of_get_stdout(void)
{
return of_stdout;

16
include/dm/of_access.h
View File

@ -393,6 +393,22 @@ int of_alias_scan(void);
*/
int of_alias_get_id(const struct device_node *np, const char *stem);
/**
* of_alias_get_dev - Get device_node by given stem and alias id
*
* Travels the lookup table to get the device_node by given stem and alias id.
*
* @stem: Alias stem of the given device_node
* @id: Alias id of the given device_node
* @return device_node, if found, else NULL
*/
struct device_node *of_alias_get_dev(const char *stem, int id);
/**
* of_alias_dump - Dump of alias nodes added in aliases_lookup.
*/
struct device_node *of_alias_dump(void);
/**
* of_get_stdout() - Get node to use for stdout
*