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authorMika Westerberg <mika.westerberg@linux.intel.com>2017-03-28 10:52:20 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-29 01:00:28 +0300
commit79389a83bc3888a900191e3990cda5c76f2ca1ec (patch)
tree4b4276b07b604d56da9713bcb698e7b2191977be /include/linux/acpi.h
parent21ea73f54c6d77f35381c79870160496c9e78b60 (diff)
downloadlinux-79389a83bc3888a900191e3990cda5c76f2ca1ec.tar.xz
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/acpi.h')
-rw-r--r--include/linux/acpi.h23
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)) \