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device property: Add fwnode_get_parent()

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Now that ACPI has support for returning parent firmware node for both types
of nodes we can expose this to others as well. This adds a new function
fwnode_get_parent() that can be used for DT and ACPI nodes to retrieve the
parent firmware node.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2017-03-28 10:52:17 +03:00 • committed by Rafael J. Wysocki
parent dfa672fbc0
commit afaf26fd84
2 changed files with 27 additions and 0 deletions
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25
drivers/base/property.c
View file

@ -931,6 +931,31 @@ int device_add_properties(struct device *dev,
} }
EXPORT_SYMBOL_GPL(device_add_properties); EXPORT_SYMBOL_GPL(device_add_properties);
/**
* fwnode_get_parent - Return parent firwmare node
* @fwnode: Firmware whose parent is retrieved
*
* Return parent firmware node of the given node if possible or %NULL if no
* parent was available.
*/
struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode)
{
struct fwnode_handle *parent = NULL;
if (is_of_node(fwnode)) {
struct device_node *node;
node = of_get_parent(to_of_node(fwnode));
if (node)
parent = &node->fwnode;
} else if (is_acpi_node(fwnode)) {
parent = acpi_node_get_parent(fwnode);
}
return parent;
}
EXPORT_SYMBOL_GPL(fwnode_get_parent);
/** /**
* device_get_next_child_node - Return the next child node handle for a device * device_get_next_child_node - Return the next child node handle for a device
* @dev: Device to find the next child node for. * @dev: Device to find the next child node for.

2
include/linux/property.h
View file

@ -70,6 +70,8 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode,
int fwnode_property_match_string(struct fwnode_handle *fwnode, int fwnode_property_match_string(struct fwnode_handle *fwnode,
const char *propname, const char *string); const char *propname, const char *string);
struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode);
struct fwnode_handle *device_get_next_child_node(struct device *dev, struct fwnode_handle *device_get_next_child_node(struct device *dev,
struct fwnode_handle *child); struct fwnode_handle *child);