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software node: Implement get_named_child_node fwnode callback 

This makes it possible to support drivers that use
fwnode_get_named_child_node() and device_get_named_child_node()
functions.

The node name is for now taken from a device property named
"name". That mimics the old style of naming of the nodes in
devicetree (though with modern flattened DT, the name is
matched against the actual node-name, it used to be done
with a property "name"). In Open Firmware DT the "name"
property is also still being used.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Heikki Krogerus 2019-02-13 14:55:49 +03:00 committed by Rafael J. Wysocki
parent 2b6e492467
commit 344798206f
1 changed files with 23 additions and 0 deletions
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23
drivers/base/swnode.c
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@ -499,6 +499,28 @@ software_node_get_next_child(const struct fwnode_handle *fwnode,
return &c->fwnode;
}
static struct fwnode_handle *
software_node_get_named_child_node(const struct fwnode_handle *fwnode,
const char *childname)
{
struct software_node *swnode = to_software_node(fwnode);
const struct property_entry *prop;
struct software_node *child;
if (!swnode || list_empty(&swnode->children))
return NULL;
list_for_each_entry(child, &swnode->children, entry) {
prop = property_entry_get(child->properties, "name");
if (!prop)
continue;
if (!strcmp(childname, prop->value.str)) {
kobject_get(&child->kobj);
return &child->fwnode;
}
}
return NULL;
}
static const struct fwnode_operations software_node_ops = {
.get = software_node_get,
@ -508,6 +530,7 @@ static const struct fwnode_operations software_node_ops = {
.property_read_string_array = software_node_read_string_array,
.get_parent = software_node_get_parent,
.get_next_child_node = software_node_get_next_child,
.get_named_child_node = software_node_get_named_child_node,
};
/* -------------------------------------------------------------------------- */