diff options
| author |   Mika Westerberg <mika.westerberg@linux.intel.com> | 2017-03-28 10:52:20 +0300 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-03-29 00:00:28 +0200 |
| commit | 79389a83bc3888a900191e3990cda5c76f2ca1ec (patch) | |
| tree | 4b4276b07b604d56da9713bcb698e7b2191977be /include/linux | |
| parent | device property: Add fwnode_get_named_child_node() (diff) | |
| download | linux-dev-79389a83bc3888a900191e3990cda5c76f2ca1ec.tar.xz linux-dev-79389a83bc3888a900191e3990cda5c76f2ca1ec.zip | |
ACPI / property: Add support for remote endpoints
DT has had concept of remote endpoints for some time already. It makes
possible to reference another firmware node through a property called
remote-endpoint. This is already used by some subsystems like v4l2 for
parsing hardware properties related to camera.
This patch adds ACPI support for remote endpoints utilizing _DSD
hierarchical data extensions.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/acpi.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 4eb1f5941ede..add8a96e1977 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1001,6 +1001,13 @@ struct fwnode_handle *acpi_get_next_subnode(struct fwnode_handle *fwnode, struct fwnode_handle *child); struct fwnode_handle *acpi_node_get_parent(struct fwnode_handle *fwnode); +struct fwnode_handle *acpi_graph_get_next_endpoint(struct fwnode_handle *fwnode, + struct fwnode_handle *prev); +int acpi_graph_get_remote_endpoint(struct fwnode_handle *fwnode, + struct fwnode_handle **remote, + struct fwnode_handle **port, + struct fwnode_handle **endpoint); + struct acpi_probe_entry; typedef bool (*acpi_probe_entry_validate_subtbl)(struct acpi_subtable_header *, struct acpi_probe_entry *); @@ -1128,6 +1135,22 @@ acpi_node_get_parent(struct fwnode_handle *fwnode) return NULL; } +static inline struct fwnode_handle * +acpi_graph_get_next_endpoint(struct fwnode_handle *fwnode, + struct fwnode_handle *prev) +{ + return ERR_PTR(-ENXIO); +} + +static inline int +acpi_graph_get_remote_endpoint(struct fwnode_handle *fwnode, + struct fwnode_handle **remote, + struct fwnode_handle **port, + struct fwnode_handle **endpoint) +{ + return -ENXIO; +} + #define ACPI_DECLARE_PROBE_ENTRY(table, name, table_id, subtable, valid, data, fn) \ static const void * __acpi_table_##name[] \ __attribute__((unused)) \ |