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/base/property.c b/drivers/base/property.c
index 673e235..d0b65bb 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -665,6 +665,34 @@
}
EXPORT_SYMBOL_GPL(fwnode_property_match_string);
+/**
+ * fwnode_property_get_reference_args() - Find a reference with arguments
+ * @fwnode: Firmware node where to look for the reference
+ * @prop: The name of the property
+ * @nargs_prop: The name of the property telling the number of
+ * arguments in the referred node. NULL if @nargs is known,
+ * otherwise @nargs is ignored. Only relevant on OF.
+ * @nargs: Number of arguments. Ignored if @nargs_prop is non-NULL.
+ * @index: Index of the reference, from zero onwards.
+ * @args: Result structure with reference and integer arguments.
+ *
+ * Obtain a reference based on a named property in an fwnode, with
+ * integer arguments.
+ *
+ * Caller is responsible to call fwnode_handle_put() on the returned
+ * args->fwnode pointer.
+ *
+ */
+int fwnode_property_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)
+{
+ return fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
+ nargs, index, args);
+}
+EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
+
static int property_copy_string_array(struct property_entry *dst,
const struct property_entry *src)
{