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dt: add of_platform_populate() for creating device from the device tree 

of_platform_populate() is similar to of_platform_bus_probe() except
that it strictly enforces that all device nodes must have a compatible
property, and it can be used to register devices (not buses) which are
children of the root node.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely 2011-06-21 10:59:34 -06:00
parent cbb49c2665
commit 29d4f8a497
2 changed files with 53 additions and 4 deletions
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54
drivers/of/platform.c
View File

@ -229,19 +229,26 @@ EXPORT_SYMBOL(of_platform_device_create);
*/
static int of_platform_bus_create(struct device_node *bus,
const struct of_device_id *matches,
struct device *parent)
struct device *parent, bool strict)
{
struct device_node *child;
struct platform_device *dev;
int rc = 0;
/* Make sure it has a compatible property */
if (strict && (!of_get_property(bus, "compatible", NULL))) {
pr_debug("%s() - skipping %s, no compatible prop\n",
__func__, bus->full_name);
return 0;
}
dev = of_platform_device_create(bus, NULL, parent);
if (!dev || !of_match_node(matches, bus))
return 0;
for_each_child_of_node(bus, child) {
pr_debug(" create child: %s\n", child->full_name);
rc = of_platform_bus_create(child, matches, &dev->dev);
rc = of_platform_bus_create(child, matches, &dev->dev, strict);
if (rc) {
of_node_put(child);
break;
@ -275,11 +282,11 @@ int of_platform_bus_probe(struct device_node *root,
/* Do a self check of bus type, if there's a match, create children */
if (of_match_node(matches, root)) {
rc = of_platform_bus_create(root, matches, parent);
rc = of_platform_bus_create(root, matches, parent, false);
} else for_each_child_of_node(root, child) {
if (!of_match_node(matches, child))
continue;
rc = of_platform_bus_create(child, matches, parent);
rc = of_platform_bus_create(child, matches, parent, false);
if (rc)
break;
}
@ -288,4 +295,43 @@ int of_platform_bus_probe(struct device_node *root,
return rc;
}
EXPORT_SYMBOL(of_platform_bus_probe);
/**
* of_platform_populate() - Populate platform_devices from device tree data
* @root: parent of the first level to probe or NULL for the root of the tree
* @matches: match table, NULL to use the default
* @parent: parent to hook devices from, NULL for toplevel
*
* Similar to of_platform_bus_probe(), this function walks the device tree
* and creates devices from nodes. It differs in that it follows the modern
* convention of requiring all device nodes to have a 'compatible' property,
* and it is suitable for creating devices which are children of the root
* node (of_platform_bus_probe will only create children of the root which
* are selected by the @matches argument).
*
* New board support should be using this function instead of
* of_platform_bus_probe().
*
* Returns 0 on success, < 0 on failure.
*/
int of_platform_populate(struct device_node *root,
const struct of_device_id *matches,
struct device *parent)
{
struct device_node *child;
int rc = 0;
root = root ? of_node_get(root) : of_find_node_by_path("/");
if (!root)
return -EINVAL;
for_each_child_of_node(root, child) {
rc = of_platform_bus_create(child, matches, parent, true);
if (rc)
break;
}
of_node_put(root);
return rc;
}
#endif /* !CONFIG_SPARC */

3
include/linux/of_platform.h
View File

@ -57,6 +57,9 @@ extern struct platform_device *of_platform_device_create(struct device_node *np,
extern int of_platform_bus_probe(struct device_node *root,
const struct of_device_id *matches,
struct device *parent);
extern int of_platform_populate(struct device_node *root,
const struct of_device_id *matches,
struct device *parent);
#endif /* !CONFIG_SPARC */
#endif /* CONFIG_OF_DEVICE */