在drivers/base下的platform.c中：

struct device platform_bus = {
	.init_name	= "platform",
};

struct kobject *kobj = NULL;
/* create attribute interface */
kobj = kobject_create_and_add("display", &platform_bus.kobj); //在/sys/devices/platform中新增一個裝置目錄
	if (! kobj) {
		printk(KERN_ERR "Fail, create kobject for display\n");
		return -ret;
	}

	ret = sysfs_create_group(kobj, &attr_group); //為裝置新增屬性。
 

struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
{
	struct kobject *kobj;
	int retval;

	kobj = kobject_create();
	if (!kobj)
		return NULL;

	retval = kobject_add(kobj, parent, "%s", name);
	if (retval) {
		printk(KERN_WARNING "%s: kobject_add error: %d\n",
		       __func__, retval);
		kobject_put(kobj);
		kobj = NULL;
	}
	return kobj;
}
EXPORT_SYMBOL_GPL(kobject_create_and_add);