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authorMika Westerberg <mika.westerberg@linux.intel.com>2017-03-28 10:52:16 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-29 00:00:27 +0200
commitdfa672fbc0d9e83ff0dc1a75f1f5d0e59a30706b (patch)
tree06e8d3f68a8c47487717282ed0771fbb1a9d32b6 /include/acpi
parentc02ed2e75ef4c74e41e421acb4ef1494671585e8 (diff)
ACPI / property: Add possiblity to retrieve parent firmware node
Sometimes it is useful to be able to navigate firmware node hierarchy upwards toward parent nodes. ACPI device nodes are pretty much already supported because ACPICA provides acpi_get_parent(). ACPI data nodes, however, are all below the same parent ACPI device. Their hierarchy is created by "linking" each other using references in the value field. Add parent pointer to the parent data node while we create them so it is easy to navigate the hierarchy backwards. We use this parent pointer in a new function acpi_node_get_parent() that is able to extract parent of both ACPI firmware node types. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/acpi_bus.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index ef0ae8aaa567..49cca52b214b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -386,6 +386,7 @@ struct acpi_data_node {
const char *name;
acpi_handle handle;
struct fwnode_handle fwnode;
+ struct fwnode_handle *parent;
struct acpi_device_data data;
struct list_head sibling;
struct kobject kobj;