drivers/rtc/rtc-sirfsoc.c: add rtc drivers for CSR SiRFprimaII and SiRFatlasVI
authorXianglong Du <Xianglong.Du@csr.com>
Wed, 3 Jul 2013 22:08:04 +0000 (15:08 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 3 Jul 2013 23:08:01 +0000 (16:08 -0700)
commite88b815e011bcacb7066f1156ce390f6b0adc9df
tree99f50a40cdb0d506885be516f5a2abea4c164fd5
parent061d2a3e39c4686039519509d69cd31c7841f666
drivers/rtc/rtc-sirfsoc.c: add rtc drivers for CSR SiRFprimaII and SiRFatlasVI

On CSR SiRFprimaII/atlasVI, there is a programmable 16-bit divider
(RTC_DIV) that divides the input 32.768KHz clock to the frequency that
users need (E.g.  1 Hz).  The divided real-time clock will be used to
drive a 32-bit counter (RTC_COUNTER) that provides users with the actual
time.

In each cycle of the divided real-time clock, there is a Hertz interrupt
generated to the RISC.  Users can also configure an alarm (RTC_ALARM).
When RTC_COUNTER matches the alarm, there will be an alarm interrupt
generated to the RISC.

The system RTC can generate an alarm wake-up signal to notify the power
controller to wake up from power saving mode.

Signed-off-by: Xianglong Du <Xianglong.Du@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/arm/boot/dts/atlas6.dtsi
arch/arm/boot/dts/prima2.dtsi
drivers/rtc/Kconfig
drivers/rtc/Makefile
drivers/rtc/rtc-sirfsoc.c [new file with mode: 0644]