Commit aaaf5fbf authored by Joshua Kinard's avatar Joshua Kinard Committed by Linus Torvalds

rtc: add driver for DS1685 family of real time clocks

This adds a driver for the Dallas/Maxim DS1685-family of RTC chips.  It
supports the DS1685/DS1687, DS1688/DS1691, DS1689/DS1693, DS17285/DS17287,
DS17485/DS17487, and DS17885/DS17887 RTC chips.  These chips are commonly
found in SGI O2 and SGI Octane systems.  It was originally derived from a
driver patch submitted by Matthias Fuchs many years ago for use in
EPPC-405-UC modules, which also used these RTCs.  In addition to the
time-keeping functions, this RTC also handles the shutdown mechanism of
the O2 and Octane and acts as a partial NVRAM for the boot PROMS in these
systems.

Verified on both an SGI O2 and an SGI Octane.
Signed-off-by: default avatarJoshua Kinard <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Signed-off-by: default avatarAndrew Morton <[email protected]>
Signed-off-by: default avatarLinus Torvalds <[email protected]>
parent befeb596
......@@ -2963,6 +2963,12 @@ S: Supported
F: drivers/input/touchscreen/cyttsp*
F: include/linux/input/cyttsp.h
DALLAS/MAXIM DS1685-FAMILY REAL TIME CLOCK
M: Joshua Kinard <[email protected]>
S: Maintained
F: drivers/rtc/rtc-ds1685.c
F: include/linux/rtc/ds1685.h
DAMA SLAVE for AX.25
M: Joerg Reuter <[email protected]>
W: http://yaina.de/jreuter/
......
......@@ -801,6 +801,96 @@ config RTC_DRV_DS1553
This driver can also be built as a module. If so, the module
will be called rtc-ds1553.
config RTC_DRV_DS1685_FAMILY
tristate "Dallas/Maxim DS1685 Family"
help
If you say yes here you get support for the Dallas/Maxim DS1685
family of real time chips. This family includes the DS1685/DS1687,
DS1689/DS1693, DS17285/DS17287, DS17485/DS17487, and
DS17885/DS17887 chips.
This driver can also be built as a module. If so, the module
will be called rtc-ds1685.
choice
prompt "Subtype"
depends on RTC_DRV_DS1685_FAMILY
default RTC_DRV_DS1685
config RTC_DRV_DS1685
bool "DS1685/DS1687"
help
This enables support for the Dallas/Maxim DS1685/DS1687 real time
clock chip.
This chip is commonly found in SGI O2 (IP32) and SGI Octane (IP30)
systems, as well as EPPC-405-UC modules by electronic system design
GmbH.
config RTC_DRV_DS1689
bool "DS1689/DS1693"
help
This enables support for the Dallas/Maxim DS1689/DS1693 real time
clock chip.
This is an older RTC chip, supplanted by the DS1685/DS1687 above,
which supports a few minor features such as Vcc, Vbat, and Power
Cycle counters, plus a customer-specific, 8-byte ROM/Serial number.
It also works for the even older DS1688/DS1691 RTC chips, which are
virtually the same and carry the same model number. Both chips
have 114 bytes of user NVRAM.
config RTC_DRV_DS17285
bool "DS17285/DS17287"
help
This enables support for the Dallas/Maxim DS17285/DS17287 real time
clock chip.
This chip features 2kb of extended NV-SRAM. It may possibly be
found in some SGI O2 systems (rare).
config RTC_DRV_DS17485
bool "DS17485/DS17487"
help
This enables support for the Dallas/Maxim DS17485/DS17487 real time
clock chip.
This chip features 4kb of extended NV-SRAM.
config RTC_DRV_DS17885
bool "DS17885/DS17887"
help
This enables support for the Dallas/Maxim DS17885/DS17887 real time
clock chip.
This chip features 8kb of extended NV-SRAM.
endchoice
config RTC_DS1685_PROC_REGS
bool "Display register values in /proc"
depends on RTC_DRV_DS1685_FAMILY && PROC_FS
help
Enable this to display a readout of all of the RTC registers in
/proc/drivers/rtc. Keep in mind that this can potentially lead
to lost interrupts, as reading Control Register C will clear
all pending IRQ flags.
Unless you are debugging this driver, choose N.
config RTC_DS1685_SYSFS_REGS
bool "SysFS access to RTC register bits"
depends on RTC_DRV_DS1685_FAMILY && SYSFS
help
Enable this to provide access to the RTC control register bits
in /sys. Some of the bits are read-write, others are read-only.
Keep in mind that reading Control C's bits automatically clears
all pending IRQ flags - this can cause lost interrupts.
If you know that you need access to these bits, choose Y, Else N.
config RTC_DRV_DS1742
tristate "Maxim/Dallas DS1742/1743"
depends on HAS_IOMEM
......
......@@ -54,6 +54,7 @@ obj-$(CONFIG_RTC_DRV_DS1390) += rtc-ds1390.o
obj-$(CONFIG_RTC_DRV_DS1511) += rtc-ds1511.o
obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
obj-$(CONFIG_RTC_DRV_DS1685_FAMILY) += rtc-ds1685.o
obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
obj-$(CONFIG_RTC_DRV_DS2404) += rtc-ds2404.o
obj-$(CONFIG_RTC_DRV_DS3232) += rtc-ds3232.o
......
This diff is collapsed.
This diff is collapsed.
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment