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| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2017-07-21 15:11:49 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-07-22 01:04:51 +0300 |
| commit | 3e3119d3088f41106f3581d39e7694a50ca3fc02 (patch) | |
| tree | b7215757dd95eda454860929de50319ca5f5d432 /drivers/of | |
| parent | 37ba983cfb47cc7b353146422c437468fcb29c61 (diff) | |
| download | linux-3e3119d3088f41106f3581d39e7694a50ca3fc02.tar.xz | |
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>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/property.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/of/property.c b/drivers/of/property.c index ae46a6f0ea36..3868400972b8 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -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, |