3c2b9075cb
Add support for the Epson RX-8025SA/NB RTC chips. It includes support for alarms, periodic interrupts (1 Hz) and clock precision adjustment. For clock precision adjustment, the SYSFS file "clock_adjust_ppb" gets created in "/sys/class/rtc/rtcX/device". It permits to set and get the clock adjustment in ppb (parts per billion), e.g.: # echo -183000 > /sys/class/rtc/rtc0/device/clock_adjust_ppb # cat /sys/class/rtc/rtc0/device/clock_adjust_ppb -183000 This allows to compensate temperature dependent clock drifts. According to the RX8025 SA/NB application manual the frequency and temperature characteristics can be approximated using the following equation: df = a * (ut - t)**2 df: Frequency deviation in any temperature a : Coefficient = (-35 +-5) * 10**-9 ut: Ultimate temperature in degree = +25 +-5 degree t : Any temperature in degree Signed-off-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: Sergei Poselenov <sposelenov@emcraft.com> Signed-off-by: Yuri Tikhonov <yur@emcraft.com> Signed-off-by: Dmitry Rakhchev <rda@emcraft.com> Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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.. | ||
class.c | ||
hctosys.c | ||
interface.c | ||
Kconfig | ||
Makefile | ||
rtc-at32ap700x.c | ||
rtc-at91rm9200.c | ||
rtc-at91sam9.c | ||
rtc-au1xxx.c | ||
rtc-bfin.c | ||
rtc-bq4802.c | ||
rtc-cmos.c | ||
rtc-core.h | ||
rtc-dev.c | ||
rtc-dm355evm.c | ||
rtc-ds1216.c | ||
rtc-ds1286.c | ||
rtc-ds1302.c | ||
rtc-ds1305.c | ||
rtc-ds1307.c | ||
rtc-ds1374.c | ||
rtc-ds1390.c | ||
rtc-ds1511.c | ||
rtc-ds1553.c | ||
rtc-ds1672.c | ||
rtc-ds1742.c | ||
rtc-ds3234.c | ||
rtc-efi.c | ||
rtc-ep93xx.c | ||
rtc-fm3130.c | ||
rtc-generic.c | ||
rtc-isl1208.c | ||
rtc-lib.c | ||
rtc-m41t80.c | ||
rtc-m41t94.c | ||
rtc-m48t35.c | ||
rtc-m48t59.c | ||
rtc-m48t86.c | ||
rtc-max6900.c | ||
rtc-max6902.c | ||
rtc-mv.c | ||
rtc-omap.c | ||
rtc-pcf8563.c | ||
rtc-pcf8583.c | ||
rtc-pcf50633.c | ||
rtc-pl030.c | ||
rtc-pl031.c | ||
rtc-proc.c | ||
rtc-ps3.c | ||
rtc-pxa.c | ||
rtc-r9701.c | ||
rtc-rs5c313.c | ||
rtc-rs5c348.c | ||
rtc-rs5c372.c | ||
rtc-rx8025.c | ||
rtc-rx8581.c | ||
rtc-s3c.c | ||
rtc-s35390a.c | ||
rtc-sa1100.c | ||
rtc-sh.c | ||
rtc-starfire.c | ||
rtc-stk17ta8.c | ||
rtc-sun4v.c | ||
rtc-sysfs.c | ||
rtc-test.c | ||
rtc-twl4030.c | ||
rtc-tx4939.c | ||
rtc-v3020.c | ||
rtc-vr41xx.c | ||
rtc-wm8350.c | ||
rtc-x1205.c |