device property: Introduce fwnode_property_get_reference_args
The new fwnode_property_get_reference_args() interface amends the fwnode
property API with the functionality of both of_parse_phandle_with_args()
and __acpi_node_get_property_reference().
The semantics is slightly different: the cells property is ignored on ACPI
as the number of arguments can be explicitly obtained from the firmware
interface.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index f8d60051..681a843 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1195,6 +1195,32 @@ acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
return NULL;
}
+static int
+acpi_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
+ const char *prop, const char *nargs_prop,
+ unsigned int args_count, unsigned int index,
+ struct fwnode_reference_args *args)
+{
+ struct acpi_reference_args acpi_args;
+ unsigned int i;
+ int ret;
+
+ ret = __acpi_node_get_property_reference(fwnode, prop, index,
+ args_count, &acpi_args);
+ if (ret < 0)
+ return ret;
+ if (!args)
+ return 0;
+
+ args->nargs = acpi_args.nargs;
+ args->fwnode = acpi_fwnode_handle(acpi_args.adev);
+
+ for (i = 0; i < NR_FWNODE_REFERENCE_ARGS; i++)
+ args->args[i] = i < acpi_args.nargs ? acpi_args.args[i] : 0;
+
+ return 0;
+}
+
static struct fwnode_handle *
acpi_fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
struct fwnode_handle *prev)
@@ -1248,6 +1274,7 @@ static int acpi_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
.get_parent = acpi_node_get_parent, \
.get_next_child_node = acpi_get_next_subnode, \
.get_named_child_node = acpi_fwnode_get_named_child_node, \
+ .get_reference_args = acpi_fwnode_get_reference_args, \
.graph_get_next_endpoint = \
acpi_fwnode_graph_get_next_endpoint, \
.graph_get_remote_endpoint = \