stm_source_register_device
return stm_source_register_device(NULL, &stm_console.data);
EXPORT_SYMBOL_GPL(stm_source_register_device);
ret = stm_source_register_device(NULL, &stm_ftrace.data);
ret = stm_source_register_device(NULL, &stm_heartbeat[i].data);
int stm_source_register_device(struct device *parent,