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ACPI / property: Add support for remote endpoints

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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>
This commit is contained in:
Mika Westerberg 2017-03-28 10:52:20 +03:00 • committed by Rafael J. Wysocki
parent 21ea73f54c
commit 79389a83bc
2 changed files with 161 additions and 0 deletions
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23
include/linux/acpi.h
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@ -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)) \