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OF: Add helper for matching against linux,stdout-path

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devicetrees may have a linux,stdout-path property in the chosen
node describing the console device. This adds a helper function
to match a device against this property so a driver can call
add_preferred_console for a matching device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sascha Hauer
2013-08-05 14:40:44 +02:00
committed by Greg Kroah-Hartman
parent a324e4de0c
commit 5c19e95216
2 changed files with 33 additions and 0 deletions
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26
drivers/of/base.c
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@@ -32,6 +32,7 @@ struct device_node *of_allnodes;
EXPORT_SYMBOL(of_allnodes);
struct device_node *of_chosen;
struct device_node *of_aliases;
static struct device_node *of_stdout;
DEFINE_MUTEX(of_aliases_mutex);
@@ -1595,6 +1596,15 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
of_chosen = of_find_node_by_path("/chosen");
if (of_chosen == NULL)
of_chosen = of_find_node_by_path("/chosen@0");
if (of_chosen) {
const char *name;
name = of_get_property(of_chosen, "linux,stdout-path", NULL);
if (name)
of_stdout = of_find_node_by_path(name);
}
of_aliases = of_find_node_by_path("/aliases");
if (!of_aliases)
return;
@@ -1703,3 +1713,19 @@ const char *of_prop_next_string(struct property *prop, const char *cur)
return curv;
}
EXPORT_SYMBOL_GPL(of_prop_next_string);
/**
* of_device_is_stdout_path - check if a device node matches the
* linux,stdout-path property
*
* Check if this device node matches the linux,stdout-path property
* in the chosen node. return true if yes, false otherwise.
*/
int of_device_is_stdout_path(struct device_node *dn)
{
if (!of_stdout)
return false;
return of_stdout == dn;
}
EXPORT_SYMBOL_GPL(of_device_is_stdout_path);