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authorMika Westerberg <mika.westerberg@linux.intel.com>2017-03-28 10:52:18 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-29 00:00:27 +0200
commit34055190b19d7c634caf738c8ca195cad06550cd (patch)
tree282a24612b1c5c363cb30f2c29d8e96cadbcd51c /drivers/base
parentafaf26fd8458be29949ae5a52c65a464a1b0cbb6 (diff)
downloadlinux-34055190b19d7c634caf738c8ca195cad06550cd.tar.bz2
ACPI / property: Add fwnode_get_next_child_node()
The ACPI _DSD hierarchical data extension makes it possible to have hierarchies deeper than one level in similar way than DT allows. These "subsubnodes" have not been accessible because device property implementation only provides device_get_next_child_node() that is limited to direct descendants of a device. We need this ability in order support things like remote endpoints currently supported in DT with of_graph_* APIs. Modify acpi_get_next_subnode() to accept fwnode handle instead and update callers accordingly. Also add a new function fwnode_get_next_child_node() that works directly with fwnodes and modify device_get_next_child_node() to call it directly. While there add a macro fwnode_for_each_child_node() analogous to the current device_for_each_child_node() but it works with fwnodes instead of devices. Link: http://www.uefi.org/sites/default/files/resources/_DSD-hierarchical-data-extension-UUID-v1.pdf Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/property.c38
1 files changed, 30 insertions, 8 deletions
diff --git a/drivers/base/property.c b/drivers/base/property.c
index a25233430d18..bc0f07ac48f6 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -957,24 +957,46 @@ struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode)
EXPORT_SYMBOL_GPL(fwnode_get_parent);
/**
- * device_get_next_child_node - Return the next child node handle for a device
- * @dev: Device to find the next child node for.
- * @child: Handle to one of the device's child nodes or a null handle.
+ * fwnode_get_next_child_node - Return the next child node handle for a node
+ * @fwnode: Firmware node to find the next child node for.
+ * @child: Handle to one of the node's child nodes or a %NULL handle.
*/
-struct fwnode_handle *device_get_next_child_node(struct device *dev,
+struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode,
struct fwnode_handle *child)
{
- if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
+ if (is_of_node(fwnode)) {
struct device_node *node;
- node = of_get_next_available_child(dev->of_node, to_of_node(child));
+ node = of_get_next_available_child(to_of_node(fwnode),
+ to_of_node(child));
if (node)
return &node->fwnode;
- } else if (IS_ENABLED(CONFIG_ACPI)) {
- return acpi_get_next_subnode(dev, child);
+ } else if (is_acpi_node(fwnode)) {
+ return acpi_get_next_subnode(fwnode, child);
}
+
return NULL;
}
+EXPORT_SYMBOL_GPL(fwnode_get_next_child_node);
+
+/**
+ * device_get_next_child_node - Return the next child node handle for a device
+ * @dev: Device to find the next child node for.
+ * @child: Handle to one of the device's child nodes or a null handle.
+ */
+struct fwnode_handle *device_get_next_child_node(struct device *dev,
+ struct fwnode_handle *child)
+{
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+ struct fwnode_handle *fwnode = NULL;
+
+ if (dev->of_node)
+ fwnode = &dev->of_node->fwnode;
+ else if (adev)
+ fwnode = acpi_fwnode_handle(adev);
+
+ return fwnode_get_next_child_node(fwnode, child);
+}
EXPORT_SYMBOL_GPL(device_get_next_child_node);
/**