Dear Xu, Hong,
adds kernel compatible RTC handling to u-boot using the RTT and one GPBRegister ... arch/arm/include/asm/arch-at91/at91_gpbr.h | 45 +++++++++++++ arch/arm/include/asm/arch-at91/at91_rtt.h | 36 ++++++++++ drivers/rtc/Makefile | 1 + drivers/rtc/at91sam9.c | 100
Some of Atmel's ARM926EJS chips have builtin RTC, for example, SAM9G45 SAM9M10 SAM9RL and new X5 serials. May we take this into account at this stage?
We can use big #ifdef to add real RTC support in drivers/rtc/at91sam9.c
I don't think that makes sense, assuming the "real rtc" uses registers that count like HHMMSS DDMMYY. It would be completely different code.
- or -
We can rename drivers/rtc/at91sam9.c to , for example, drivers/rtc/at91sam9_rtt.c, and let drivers/rtc/at91sam9.c for the real RTC support.
I'd go with that, and even suggest naming the maybe upcoming "real rtc" driver at91sam9_rtc.c to give a clearer indication of the different approaches.
Besides, for LinuX the rtt makes more sense since it directly counts in seconds since epoch.
Thanks Reinhard