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ACPI / property: Add possiblity to retrieve parent firmware node

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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>
This commit is contained in:
Mika Westerberg 2017-03-28 10:52:16 +03:00 • committed by Rafael J. Wysocki
parent c02ed2e75e
commit dfa672fbc0
3 changed files with 65 additions and 15 deletions
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7
include/linux/acpi.h
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@ -999,6 +999,7 @@ int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
struct fwnode_handle *subnode);
struct fwnode_handle *acpi_node_get_parent(struct fwnode_handle *fwnode);
struct acpi_probe_entry;
typedef bool (*acpi_probe_entry_validate_subtbl)(struct acpi_subtable_header *,
@ -1121,6 +1122,12 @@ static inline struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
return NULL;
}
static inline struct fwnode_handle *
acpi_node_get_parent(struct fwnode_handle *fwnode)
{
return NULL;
}
#define ACPI_DECLARE_PROBE_ENTRY(table, name, table_id, subtable, valid, data, fn) \
static const void * __acpi_table_##name[] \
__attribute__((unused)) \