From 4cdf854f7d60498bbda436068a118b95059b244b Mon Sep 17 00:00:00 2001 From: David Brownell Date: Wed, 6 Feb 2008 01:38:59 -0800 Subject: rtc: at91sam9 RTC support (RTT and/or RTC) AT91sam9 RTC support, primarily in the form of an RTT-as-RTC driver that was extracted from 2.6.23-at91 patch and updated: - Relies on now-merged platform updates, which associate the RTT hardware address with each RTT and use the "at91_rtt" name. - RTC framework related fixes and cleanups, notably: * removed now-needless suspend/resume clock offset logic * alarm read/write now respects the "enabled" flag * suspend always disables update irqs * shutdown (and startup) disables all irqs - Misc cleanup: * use dev_*() messaging * add comments * remove globals, * ... etc - Don't force use of RTT0 and GPBR0. Either resource may need to be used for other purposes (like NO_HZ support). - Update "AT91RM9200 RTC" Kconfig to allow it on SAM9RL chips (it has both RTT and RTC). Driver binding uses bus_find_device() to avoid needing any kind of "timer library" code when there's more than one RTT module. (This timer can be used as an RTC, to support NO_HZ operation, or potentially for other stuff. The choice is a per-system policy.) Signed-off-by: David Brownell Cc: Michel Benoit Cc: Nicolas Ferre Cc: Andrew Victor Cc: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/Kconfig | 45 +++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 41 insertions(+), 4 deletions(-) (limited to 'drivers/rtc/Kconfig') diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 484de8e4c5a..6402d699072 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -469,10 +469,47 @@ config RTC_DRV_AT32AP700X AT32AP700x family processors. config RTC_DRV_AT91RM9200 - tristate "AT91RM9200" - depends on ARCH_AT91RM9200 - help - Driver for the Atmel AT91RM9200's internal RTC (Realtime Clock). + tristate "AT91RM9200 or AT91SAM9RL" + depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL + help + Driver for the internal RTC (Realtime Clock) module found on + Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips + this is powered by the backup power supply. + +config RTC_DRV_AT91SAM9 + tristate "AT91SAM9x" + depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40) + help + 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.) + +config RTC_DRV_AT91SAM9_RTT + int + range 0 1 + default 0 + prompt "RTT module Number" if ARCH_AT91SAM9263 + depends on RTC_DRV_AT91SAM9 + help + More than one RTT module is available. You can choose which + one will be used as an RTC. The default of zero is normally + OK to use, though some systems use that for non-RTC purposes. + +config RTC_DRV_AT91SAM9_GPBR + int + range 0 3 if !ARCH_AT91SAM9263 + range 0 15 if ARCH_AT91SAM9263 + default 0 + prompt "Backup Register Number" + depends on RTC_DRV_AT91SAM9 + help + The RTC driver needs to use one of the General Purpose Backup + Registers (GPBRs) as well as the RTT. You can choose which one + will be used. The default of zero is normally OK to use, but + on some systems other software needs to use that register. config RTC_DRV_BFIN tristate "Blackfin On-Chip RTC" -- cgit v1.2.3-18-g5258