Make hym8563 default RTC (RTC0) by kernel

[OleksandrK]

The NanoPi R3S contains a hardware clock (HYM8563) with the possibility to connect a backup battery. However, the current kernel adds this clock as an additional one (RTC1).  

I tried to create a device tree overlay, but it does not work. As I understand it, this is because the default Rockchip clock is not included in the device tree.  

So, if I understand correctly, the only way to make the HYM8563 the default clock is to build the kernel with this option enabled.  

Please consider changing the default kernel options to make the HYM8563 the default RTC. 
If there’s another way to make the HYM8563 the default RTC, please advise.

[laibsch]

39 minutes ago, OleksandrK said:

Please consider changing the default kernel options to make the HYM8563 the default RTC. 

 

How would one do that exactly?