The question was whether the point to the rtc_class_ops could be made
__ro_after_init. And Russell is right, it is pointed to by the ops
pointer in a struct rtc_device and that struct is dynamically allocated
in rtc_device_register().

OK, I think it's a terminology issue.  You mean the structure that
contains the pointer, and not the pointer itself, which is already const.

thanks,
julia