> [Severity: Medium]
> The commit message mentions that the RZ/T2H RTC variant supports a 1Hz clock
> output signal on the RTCAT1HZ pin. Since this introduces a clock provider
> capability, shouldn't the #clock-cells property be documented and required
> here with an appropriate const constraint?

X5H has this as well but the feature has neither been implemented nor
tested yet. So, I suggest to add related properties incrementally.