since the frequency is stored in the irq_freq member of the rtc_device
structure. Your driver needs to initialize the irq_freq member during
init. Make sure you check the requested frequency is in range of your
- hardware in the irq_set_freq function. If you cannot actually change
- the frequency, just return -ENOTTY.
+ hardware in the irq_set_freq function. If it isn't, return -EINVAL. If
+ you cannot actually change the frequency, do not define irq_set_freq.
If all else fails, check out the rtc-test.c driver!