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device property: Introduce fwnode_property_get_reference_args

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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>
This commit is contained in:
Sakari Ailus
2017-07-21 15:11:49 +03:00
committed by Rafael J. Wysocki
parent 37ba983cfb
commit 3e3119d308
5 changed files with 109 additions and 0 deletions
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31
drivers/of/property.c
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@@ -891,6 +891,36 @@ of_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
return NULL;
}
static int
of_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
const char *prop, const char *nargs_prop,
unsigned int nargs, unsigned int index,
struct fwnode_reference_args *args)
{
struct of_phandle_args of_args;
unsigned int i;
int ret;
if (nargs_prop)
ret = of_parse_phandle_with_args(to_of_node(fwnode), prop,
nargs_prop, index, &of_args);
else
ret = of_parse_phandle_with_fixed_args(to_of_node(fwnode), prop,
nargs, index, &of_args);
if (ret < 0)
return ret;
if (!args)
return 0;
args->nargs = of_args.args_count;
args->fwnode = of_fwnode_handle(of_args.np);
for (i = 0; i < NR_FWNODE_REFERENCE_ARGS; i++)
args->args[i] = i < of_args.args_count ? of_args.args[i] : 0;
return 0;
}
static struct fwnode_handle *
of_fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
struct fwnode_handle *prev)
@@ -949,6 +979,7 @@ const struct fwnode_operations of_fwnode_ops = {
.get_parent = of_fwnode_get_parent,
.get_next_child_node = of_fwnode_get_next_child_node,
.get_named_child_node = of_fwnode_get_named_child_node,
.get_reference_args = of_fwnode_get_reference_args,
.graph_get_next_endpoint = of_fwnode_graph_get_next_endpoint,
.graph_get_remote_endpoint = of_fwnode_graph_get_remote_endpoint,
.graph_get_port_parent = of_fwnode_graph_get_port_parent,