usb: gadget: aspeed: allow to set usb strings in device tree

	return 0;

}

static const struct {

	const char *name;

	u8 id;

} str_id_map[] = {

	{"manufacturer",	AST_VHUB_STR_MANUF},

	{"product",		AST_VHUB_STR_PRODUCT},

	{"serial-number",	AST_VHUB_STR_SERIAL},

	{},

};

static int ast_vhub_of_parse_str_desc(struct ast_vhub *vhub,

				      const struct device_node *desc_np)

{

	u32 langid;

	int ret = 0;

	int i, offset;

	const char *str;

	struct device_node *child;

	struct usb_string str_array[AST_VHUB_STR_INDEX_MAX];

	struct usb_gadget_strings lang_str = {

		.strings = (struct usb_string *)str_array,

	};

	for_each_child_of_node(desc_np, child) {

		if (of_property_read_u32(child, "reg", &langid))

			continue; /* no language identifier specified */

		if (!usb_validate_langid(langid))

			continue; /* invalid language identifier */

		lang_str.language = langid;

		for (i = offset = 0; str_id_map[i].name; i++) {

			str = of_get_property(child, str_id_map[i].name, NULL);

			if (str) {

				str_array[offset].s = str;

				str_array[offset].id = str_id_map[i].id;

				offset++;

			}

		}

		str_array[offset].id = 0;

		str_array[offset].s = NULL;

		ret = ast_vhub_str_alloc_add(vhub, &lang_str);

		if (ret)

			break;

	}

	return ret;

}

static int ast_vhub_init_desc(struct ast_vhub *vhub)

{

	int ret;

	struct device_node *desc_np;

	const struct device_node *vhub_np = vhub->pdev->dev.of_node;

	/* Initialize vhub Device Descriptor. */

	memcpy(&vhub->vhub_dev_desc, &ast_vhub_dev_desc,

	/* Initialize vhub String Descriptors. */

	INIT_LIST_HEAD(&vhub->vhub_str_desc);

	desc_np = of_get_child_by_name(vhub_np, "vhub-strings");

	if (desc_np)

		ret = ast_vhub_of_parse_str_desc(vhub, desc_np);

	else

		ret = ast_vhub_str_alloc_add(vhub, &ast_vhub_strings);

	return ret;