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CONFIG_RTC_DRV_AT91SAM9: AT91SAM9x/AT91CAP9 RTT as RTC

General informations

The Linux kernel configuration item CONFIG_RTC_DRV_AT91SAM9 has multiple definitions:

AT91SAM9x/AT91CAP9 RTT as RTC found in drivers/rtc/Kconfig

The configuration item CONFIG_RTC_DRV_AT91SAM9:

Help text

RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT (Real Time Timer). These timers are powered by the backup power supply (such as a small coin cell battery), but do not need to be used as RTCs.

(On AT91SAM9rl and AT91SAM9G45 chips you probably want to use the dedicated RTC module and leave the RTT available for other uses.)

AT91SAM9x/AT91CAP9 found in drivers/rtc/Kconfig

The configuration item CONFIG_RTC_DRV_AT91SAM9:

Help text

RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT (Real Time Timer). These timers are powered by the backup power supply (such as a small coin cell battery), but do not need to be used as RTCs.

(On AT91SAM9rl chips you probably want to use the dedicated RTC module and leave the RTT available for other uses.)

AT91SAM9x found in drivers/rtc/Kconfig

The configuration item CONFIG_RTC_DRV_AT91SAM9:

Help text

RTC driver for the Atmel AT91SAM9x internal RTT (Real Time Timer). These timers are powered by the backup power supply (such as a small coin cell battery), but do not need to be used as RTCs.

(On AT91SAM9rl chips you probably want to use the dedicated RTC module and leave the RTT available for other uses.)

Hardware

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