+static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
+ struct acpi_gpio_info *info)
+{
+ struct list_head res_list;
+ int ret;
+
+ INIT_LIST_HEAD(&res_list);
+
+ ret = acpi_dev_get_resources(lookup->adev, &res_list, acpi_find_gpio,
+ lookup);
+ if (ret < 0)
+ return ret;
+
+ acpi_dev_free_resource_list(&res_list);
+
+ if (!lookup->desc)
+ return -ENOENT;
+
+ if (info) {
+ *info = lookup->info;
+ if (lookup->active_low)
+ info->active_low = lookup->active_low;
+ }
+ return 0;
+}
+
+static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
+ const char *propname, int index,
+ struct acpi_gpio_lookup *lookup)
+{
+ struct acpi_reference_args args;
+ int ret;
+
+ memset(&args, 0, sizeof(args));
+ ret = acpi_node_get_property_reference(fwnode, propname, index, &args);
+ if (ret) {
+ struct acpi_device *adev = to_acpi_device_node(fwnode);
+
+ if (!adev)
+ return ret;
+
+ if (!acpi_get_driver_gpio_data(adev, propname, index, &args))
+ return ret;
+ }
+ /*
+ * The property was found and resolved, so need to lookup the GPIO based
+ * on returned args.
+ */
+ lookup->adev = args.adev;
+ if (args.nargs >= 2) {
+ lookup->index = args.args[0];
+ lookup->pin_index = args.args[1];
+ /* 3rd argument, if present is used to specify active_low. */
+ if (args.nargs >= 3)
+ lookup->active_low = !!args.args[2];
+ }
+ return 0;
+}
+