diff options
| author | David Brownell <david-b@pacbell.net> | 2008-02-06 01:38:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 10:41:14 -0800 |
| commit | 4cdf854f7d60498bbda436068a118b95059b244b (patch) | |
| tree | e7d5169176a48a9b5dd980baa42c9083244736e7 /drivers/rtc/Kconfig | |
| parent | f618258ad8af0413f08af60bd0eb050562e700fa (diff) | |
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 <dbrownell@users.sourceforge.net>
Cc: Michel Benoit <murpme@gmail.com>
Cc: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc/Kconfig')
| -rw-r--r-- | drivers/rtc/Kconfig | 45 |
1 files changed, 41 insertions, 4 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 484de8e4c5ae..6402d699072b 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" |