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Kconfig
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#
# RTC class/drivers configuration
#
config RTC_LIB
bool
menuconfig RTC_CLASS
bool "Real Time Clock"
default n
depends on !S390 && !UML
select RTC_LIB
help
Generic RTC class support. If you say yes here, you will
be allowed to plug one or more RTCs to your system. You will
probably want to enable one or more of the interfaces below.
if RTC_CLASS
config RTC_HCTOSYS
bool "Set system time from RTC on startup and resume"
default y
help
If you say yes here, the system time (wall clock) will be set using
the value read from a specified RTC device. This is useful to avoid
unnecessary fsck runs at boot time, and to network better.
config RTC_HCTOSYS_DEVICE
string "RTC used to set the system time"
depends on RTC_HCTOSYS
default "rtc0"
help
The RTC device that will be used to (re)initialize the system
clock, usually rtc0. Initialization is done when the system
starts up, and when it resumes from a low power state. This
device should record time in UTC, since the kernel won't do
timezone correction.
The driver for this RTC device must be loaded before late_initcall
functions run, so it must usually be statically linked.
This clock should be battery-backed, so that it reads the correct
time when the system boots from a power-off state. Otherwise, your
system will need an external clock source (like an NTP server).
If the clock you specify here is not battery backed, it may still
be useful to reinitialize system time when resuming from system
sleep states. Do not specify an RTC here unless it stays powered
during all this system's supported sleep states.
config RTC_SYSTOHC
bool "Set the RTC time based on NTP synchronization"
default y
help
If you say yes here, the system time (wall clock) will be stored
in the RTC specified by RTC_HCTOSYS_DEVICE approximately every 11
minutes if userspace reports synchronized NTP status.
config RTC_SYSTOHC_DEVICE
string "RTC used to synchronize NTP adjustment"
depends on RTC_SYSTOHC
default RTC_HCTOSYS_DEVICE if RTC_HCTOSYS
default "rtc0"
help
The RTC device used for NTP synchronization. The main difference
between RTC_HCTOSYS_DEVICE and RTC_SYSTOHC_DEVICE is that this
one can sleep when setting time, because it runs in the workqueue
context.
config RTC_DEBUG
bool "RTC debug support"
help
Say yes here to enable debugging support in the RTC framework
and individual RTC drivers.
comment "RTC interfaces"
config RTC_INTF_SYSFS
bool "/sys/class/rtc/rtcN (sysfs)"
depends on SYSFS
default RTC_CLASS
help
Say yes here if you want to use your RTCs using sysfs interfaces,
/sys/class/rtc/rtc0 through /sys/.../rtcN.
If unsure, say Y.
config RTC_INTF_PROC
bool "/proc/driver/rtc (procfs for rtcN)"
depends on PROC_FS
default RTC_CLASS
help
Say yes here if you want to use your system clock RTC through
the proc interface, /proc/driver/rtc.
Other RTCs will not be available through that API.
If there is no RTC for the system clock, then the first RTC(rtc0)
is used by default.
If unsure, say Y.
config RTC_INTF_DEV
bool "/dev/rtcN (character devices)"
default RTC_CLASS
help
Say yes here if you want to use your RTCs using the /dev
interfaces, which "udev" sets up as /dev/rtc0 through
/dev/rtcN.
You may want to set up a symbolic link so one of these
can be accessed as /dev/rtc, which is a name
expected by "hwclock" and some other programs. Recent
versions of "udev" are known to set up the symlink for you.
If unsure, say Y.
config RTC_INTF_DEV_UIE_EMUL
bool "RTC UIE emulation on dev interface"
depends on RTC_INTF_DEV
help
Provides an emulation for RTC_UIE if the underlying rtc chip
driver does not expose RTC_UIE ioctls. Those requests generate
once-per-second update interrupts, used for synchronization.
The emulation code will read the time from the hardware
clock several times per second, please enable this option
only if you know that you really need it.
config RTC_DRV_TEST
tristate "Test driver/device"
help
If you say yes here you get support for the
RTC test driver. It's a software RTC which can be
used to test the RTC subsystem APIs. It gets
the time from the system clock.
You want this driver only if you are doing development
on the RTC subsystem. Please read the source code
for further details.
This driver can also be built as a module. If so, the module
will be called rtc-test.
comment "I2C RTC drivers"
depends on I2C
if I2C
config RTC_DRV_88PM860X
tristate "Marvell 88PM860x"
depends on MFD_88PM860X
help
If you say yes here you get support for RTC function in Marvell
88PM860x chips.
This driver can also be built as a module. If so, the module
will be called rtc-88pm860x.
config RTC_DRV_88PM80X
tristate "Marvell 88PM80x"
depends on MFD_88PM800
help
If you say yes here you get support for RTC function in Marvell
88PM80x chips.
This driver can also be built as a module. If so, the module
will be called rtc-88pm80x.
config RTC_DRV_ABB5ZES3
select REGMAP_I2C
tristate "Abracon AB-RTCMC-32.768kHz-B5ZE-S3"
help
If you say yes here you get support for the Abracon
AB-RTCMC-32.768kHz-B5ZE-S3 I2C RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-ab-b5ze-s3.
config RTC_DRV_ABX80X
tristate "Abracon ABx80x"
help
If you say yes here you get support for Abracon AB080X and AB180X
families of ultra-low-power battery- and capacitor-backed real-time
clock chips.
This driver can also be built as a module. If so, the module
will be called rtc-abx80x.
config RTC_DRV_AS3722
tristate "ams AS3722 RTC driver"
depends on MFD_AS3722
help
If you say yes here you get support for the RTC of ams AS3722 PMIC
chips.
This driver can also be built as a module. If so, the module
will be called rtc-as3722.
config RTC_DRV_DS1307
tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
help
If you say yes here you get support for various compatible RTC
chips (often with battery backup) connected with I2C. This driver
should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
EPSON RX-8025 and probably other chips. In some cases the RTC
must already have been initialized (by manufacturing or a
bootloader).
The first seven registers on these chips hold an RTC, and other
registers may add features such as NVRAM, a trickle charger for
the RTC/NVRAM backup power, and alarms. NVRAM is visible in
sysfs, but other chip features may not be available.
This driver can also be built as a module. If so, the module
will be called rtc-ds1307.
config RTC_DRV_DS1374
tristate "Dallas/Maxim DS1374"
help
If you say yes here you get support for Dallas Semiconductor
DS1374 real-time clock chips. If an interrupt is associated
with the device, the alarm functionality is supported.
This driver can also be built as a module. If so, the module
will be called rtc-ds1374.
config RTC_DRV_DS1374_WDT
bool "Dallas/Maxim DS1374 watchdog timer"
depends on RTC_DRV_DS1374
help
If you say Y here you will get support for the
watchdog timer in the Dallas Semiconductor DS1374
real-time clock chips.
config RTC_DRV_DS1672
tristate "Dallas/Maxim DS1672"
help
If you say yes here you get support for the
Dallas/Maxim DS1672 timekeeping chip.
This driver can also be built as a module. If so, the module
will be called rtc-ds1672.
config RTC_DRV_DS3232
tristate "Dallas/Maxim DS3232"
help
If you say yes here you get support for Dallas Semiconductor
DS3232 real-time clock chips. If an interrupt is associated
with the device, the alarm functionality is supported.
This driver can also be built as a module. If so, the module
will be called rtc-ds3232.
config RTC_DRV_HYM8563
tristate "Haoyu Microelectronics HYM8563"
depends on OF
help
Say Y to enable support for the HYM8563 I2C RTC chip. Apart
from the usual rtc functions it provides a clock output of
up to 32kHz.
This driver can also be built as a module. If so, the module
will be called rtc-hym8563.
config RTC_DRV_LP8788
tristate "TI LP8788 RTC driver"
depends on MFD_LP8788
help
Say Y to enable support for the LP8788 RTC/ALARM driver.
config RTC_DRV_MAX6900
tristate "Maxim MAX6900"
help
If you say yes here you will get support for the
Maxim MAX6900 I2C RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-max6900.
config RTC_DRV_MAX8907
tristate "Maxim MAX8907"
depends on MFD_MAX8907
help
If you say yes here you will get support for the
RTC of Maxim MAX8907 PMIC.
This driver can also be built as a module. If so, the module
will be called rtc-max8907.
config RTC_DRV_MAX8925
tristate "Maxim MAX8925"
depends on MFD_MAX8925
help
If you say yes here you will get support for the
RTC of Maxim MAX8925 PMIC.
This driver can also be built as a module. If so, the module
will be called rtc-max8925.
config RTC_DRV_MAX8998
tristate "Maxim MAX8998"
depends on MFD_MAX8998
help
If you say yes here you will get support for the
RTC of Maxim MAX8998 PMIC.
This driver can also be built as a module. If so, the module
will be called rtc-max8998.
config RTC_DRV_MAX8997
tristate "Maxim MAX8997"
depends on MFD_MAX8997
help
If you say yes here you will get support for the
RTC of Maxim MAX8997 PMIC.
This driver can also be built as a module. If so, the module
will be called rtc-max8997.
config RTC_DRV_MAX77686
tristate "Maxim MAX77686"
depends on MFD_MAX77686
help
If you say yes here you will get support for the
RTC of Maxim MAX77686 PMIC.
This driver can also be built as a module. If so, the module
will be called rtc-max77686.
config RTC_DRV_RK808
tristate "Rockchip RK808 RTC"
depends on MFD_RK808
help
If you say yes here you will get support for the
RTC of RK808 PMIC.
This driver can also be built as a module. If so, the module
will be called rk808-rtc.
config RTC_DRV_MAX77802
tristate "Maxim 77802 RTC"
depends on MFD_MAX77686
help
If you say yes here you will get support for the
RTC of Maxim MAX77802 PMIC.
This driver can also be built as a module. If so, the module
will be called rtc-max77802.
config RTC_DRV_RS5C372
tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
help
If you say yes here you get support for the
Ricoh R2025S/D, RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
This driver can also be built as a module. If so, the module
will be called rtc-rs5c372.
config RTC_DRV_ISL1208
tristate "Intersil ISL1208"
help
If you say yes here you get support for the
Intersil ISL1208 RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-isl1208.
config RTC_DRV_ISL12022
tristate "Intersil ISL12022"
help
If you say yes here you get support for the
Intersil ISL12022 RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-isl12022.
config RTC_DRV_ISL12057
select REGMAP_I2C
tristate "Intersil ISL12057"
help
If you say yes here you get support for the Intersil ISL12057
I2C RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-isl12057.
config RTC_DRV_X1205
tristate "Xicor/Intersil X1205"
help
If you say yes here you get support for the
Xicor/Intersil X1205 RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-x1205.
config RTC_DRV_PALMAS
tristate "TI Palmas RTC driver"
depends on MFD_PALMAS
help
If you say yes here you get support for the RTC of TI PALMA series PMIC
chips.
This driver can also be built as a module. If so, the module
will be called rtc-palma.
config RTC_DRV_PCF2127
tristate "NXP PCF2127"
help
If you say yes here you get support for the NXP PCF2127/29 RTC
chips.
This driver can also be built as a module. If so, the module
will be called rtc-pcf2127.
config RTC_DRV_PCF8523
tristate "NXP PCF8523"
help
If you say yes here you get support for the NXP PCF8523 RTC
chips.
This driver can also be built as a module. If so, the module
will be called rtc-pcf8523.
config RTC_DRV_PCF8563
tristate "Philips PCF8563/Epson RTC8564"
help
If you say yes here you get support for the
Philips PCF8563 RTC chip. The Epson RTC8564
should work as well.
This driver can also be built as a module. If so, the module
will be called rtc-pcf8563.
config RTC_DRV_PCF85063
tristate "nxp PCF85063"
help
If you say yes here you get support for the PCF85063 RTC chip
This driver can also be built as a module. If so, the module
will be called rtc-pcf85063.
config RTC_DRV_PCF8583
tristate "Philips PCF8583"
help
If you say yes here you get support for the Philips PCF8583
RTC chip found on Acorn RiscPCs. This driver supports the
platform specific method of retrieving the current year from
the RTC's SRAM. It will work on other platforms with the same
chip, but the year will probably have to be tweaked.
This driver can also be built as a module. If so, the module
will be called rtc-pcf8583.
config RTC_DRV_M41T80
tristate "ST M41T62/65/M41T80/81/82/83/84/85/87 and compatible"
help
If you say Y here you will get support for the ST M41T60
and M41T80 RTC chips series. Currently, the following chips are
supported: M41T62, M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
M41ST85, M41ST87, and MicroCrystal RV4162.
This driver can also be built as a module. If so, the module
will be called rtc-m41t80.
config RTC_DRV_M41T80_WDT
bool "ST M41T65/M41T80 series RTC watchdog timer"
depends on RTC_DRV_M41T80
help
If you say Y here you will get support for the
watchdog timer in the ST M41T60 and M41T80 RTC chips series.
config RTC_DRV_BQ32K
tristate "TI BQ32000"
help
If you say Y here you will get support for the TI
BQ32000 I2C RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-bq32k.
config RTC_DRV_DM355EVM
tristate "TI DaVinci DM355 EVM RTC"
depends on MFD_DM355EVM_MSP
help
Supports the RTC firmware in the MSP430 on the DM355 EVM.
config RTC_DRV_TWL92330
bool "TI TWL92330/Menelaus"
depends on MENELAUS
help
If you say yes here you get support for the RTC on the
TWL92330 "Menelaus" power management chip, used with OMAP2
platforms. The support is integrated with the rest of
the Menelaus driver; it's not separate module.
config RTC_DRV_TWL4030
tristate "TI TWL4030/TWL5030/TWL6030/TPS659x0"
depends on TWL4030_CORE
help
If you say yes here you get support for the RTC on the
TWL4030/TWL5030/TWL6030 family chips, used mostly with OMAP3 platforms.
This driver can also be built as a module. If so, the module
will be called rtc-twl.
config RTC_DRV_TPS6586X
tristate "TI TPS6586X RTC driver"
depends on MFD_TPS6586X
help
TI Power Management IC TPS6586X supports RTC functionality
along with alarm. This driver supports the RTC driver for
the TPS6586X RTC module.
config RTC_DRV_TPS65910
tristate "TI TPS65910 RTC driver"
depends on RTC_CLASS && MFD_TPS65910
help
If you say yes here you get support for the RTC on the
TPS65910 chips.
This driver can also be built as a module. If so, the module
will be called rtc-tps65910.
config RTC_DRV_TPS80031
tristate "TI TPS80031/TPS80032 RTC driver"
depends on MFD_TPS80031
help
TI Power Management IC TPS80031 supports RTC functionality
along with alarm. This driver supports the RTC driver for
the TPS80031 RTC module.
config RTC_DRV_RC5T583
tristate "RICOH 5T583 RTC driver"
depends on MFD_RC5T583
help
If you say yes here you get support for the RTC on the
RICOH 5T583 chips.
This driver can also be built as a module. If so, the module
will be called rtc-rc5t583.
config RTC_DRV_S35390A
tristate "Seiko Instruments S-35390A"
select BITREVERSE
help
If you say yes here you will get support for the Seiko
Instruments S-35390A.
This driver can also be built as a module. If so the module
will be called rtc-s35390a.
config RTC_DRV_FM3130
tristate "Ramtron FM3130"
help
If you say Y here you will get support for the
Ramtron FM3130 RTC chips.
Ramtron FM3130 is a chip with two separate devices inside,
RTC clock and FRAM. This driver provides only RTC functionality.
This driver can also be built as a module. If so the module
will be called rtc-fm3130.
config RTC_DRV_RX8581
tristate "Epson RX-8581"
help
If you say yes here you will get support for the Epson RX-8581.
This driver can also be built as a module. If so the module
will be called rtc-rx8581.
config RTC_DRV_RX8025
tristate "Epson RX-8025SA/NB"
help
If you say yes here you get support for the Epson
RX-8025SA/NB RTC chips.
This driver can also be built as a module. If so, the module
will be called rtc-rx8025.
config RTC_DRV_EM3027
tristate "EM Microelectronic EM3027"
help
If you say yes here you get support for the EM
Microelectronic EM3027 RTC chips.
This driver can also be built as a module. If so, the module
will be called rtc-em3027.
config RTC_DRV_RV3029C2
tristate "Micro Crystal RTC"
help
If you say yes here you get support for the Micro Crystal
RV3029-C2 RTC chips.
This driver can also be built as a module. If so, the module
will be called rtc-rv3029c2.
config RTC_DRV_S5M
tristate "Samsung S2M/S5M series"
depends on MFD_SEC_CORE
help
If you say yes here you will get support for the
RTC of Samsung S2MPS14 and S5M PMIC series.
This driver can also be built as a module. If so, the module
will be called rtc-s5m.
endif # I2C
comment "SPI RTC drivers"
if SPI_MASTER
config RTC_DRV_M41T93
tristate "ST M41T93"
help
If you say yes here you will get support for the
ST M41T93 SPI RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-m41t93.
config RTC_DRV_M41T94
tristate "ST M41T94"
help
If you say yes here you will get support for the
ST M41T94 SPI RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-m41t94.
config RTC_DRV_DS1305
tristate "Dallas/Maxim DS1305/DS1306"
help
Select this driver to get support for the Dallas/Maxim DS1305
and DS1306 real time clock chips. These support a trickle
charger, alarms, and NVRAM in addition to the clock.
This driver can also be built as a module. If so, the module
will be called rtc-ds1305.
config RTC_DRV_DS1343
select REGMAP_SPI
tristate "Dallas/Maxim DS1343/DS1344"
help
If you say yes here you get support for the
Dallas/Maxim DS1343 and DS1344 real time clock chips.
Support for trickle charger, alarm is provided.
This driver can also be built as a module. If so, the module
will be called rtc-ds1343.
config RTC_DRV_DS1347
tristate "Dallas/Maxim DS1347"
help
If you say yes here you get support for the
Dallas/Maxim DS1347 chips.
This driver only supports the RTC feature, and not other chip
features such as alarms.
This driver can also be built as a module. If so, the module
will be called rtc-ds1347.
config RTC_DRV_DS1390
tristate "Dallas/Maxim DS1390/93/94"
help
If you say yes here you get support for the
Dallas/Maxim DS1390/93/94 chips.
This driver only supports the RTC feature, and not other chip
features such as alarms and trickle charging.
This driver can also be built as a module. If so, the module
will be called rtc-ds1390.
config RTC_DRV_MAX6902
tristate "Maxim MAX6902"
help
If you say yes here you will get support for the
Maxim MAX6902 SPI RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-max6902.
config RTC_DRV_R9701
tristate "Epson RTC-9701JE"
help
If you say yes here you will get support for the
Epson RTC-9701JE SPI RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-r9701.
config RTC_DRV_RS5C348
tristate "Ricoh RS5C348A/B"
help
If you say yes here you get support for the
Ricoh RS5C348A and RS5C348B RTC chips.
This driver can also be built as a module. If so, the module
will be called rtc-rs5c348.
config RTC_DRV_DS3234
tristate "Maxim/Dallas DS3234"
help
If you say yes here you get support for the
Maxim/Dallas DS3234 SPI RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-ds3234.
config RTC_DRV_PCF2123
tristate "NXP PCF2123"
help
If you say yes here you get support for the NXP PCF2123
RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-pcf2123.
config RTC_DRV_RX4581
tristate "Epson RX-4581"
help
If you say yes here you will get support for the Epson RX-4581.
This driver can also be built as a module. If so the module
will be called rtc-rx4581.
config RTC_DRV_MCP795
tristate "Microchip MCP795"
help
If you say yes here you will get support for the Microchip MCP795.
This driver can also be built as a module. If so the module
will be called rtc-mcp795.
endif # SPI_MASTER
comment "Platform RTC drivers"
# this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
# requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
# global rtc_lock ... it's not yet just another platform_device.
config RTC_DRV_CMOS
tristate "PC-style 'CMOS'"
depends on X86 || ARM || M32R || PPC || MIPS || SPARC64
default y if X86
help
Say "yes" here to get direct support for the real time clock
found in every PC or ACPI-based system, and some other boards.
Specifically the original MC146818, compatibles like those in
PC south bridges, the DS12887 or M48T86, some multifunction
or LPC bus chips, and so on.
Your system will need to define the platform device used by
this driver, otherwise it won't be accessible. This means
you can safely enable this driver if you don't know whether
or not your board has this kind of hardware.
This driver can also be built as a module. If so, the module
will be called rtc-cmos.
config RTC_DRV_ALPHA
bool "Alpha PC-style CMOS"
depends on ALPHA
default y
help
Direct support for the real-time clock found on every Alpha
system, specifically MC146818 compatibles. If in doubt, say Y.
config RTC_DRV_VRTC
tristate "Virtual RTC for Intel MID platforms"
depends on X86_INTEL_MID
default y if X86_INTEL_MID
help
Say "yes" here to get direct support for the real time clock
found on Moorestown platforms. The VRTC is a emulated RTC that
derives its clock source from a real RTC in the PMIC. The MC146818
style programming interface is mostly conserved, but any
updates are done via IPC calls to the system controller FW.
config RTC_DRV_DS1216
tristate "Dallas DS1216"
depends on SNI_RM
help
If you say yes here you get support for the Dallas DS1216 RTC chips.
config RTC_DRV_DS1286
tristate "Dallas DS1286"
depends on HAS_IOMEM
help
If you say yes here you get support for the Dallas DS1286 RTC chips.
config RTC_DRV_DS1302
tristate "Dallas DS1302"
depends on SH_SECUREEDGE5410
help
If you say yes here you get support for the Dallas DS1302 RTC chips.
config RTC_DRV_DS1511
tristate "Dallas DS1511"
depends on HAS_IOMEM
help
If you say yes here you get support for the
Dallas DS1511 timekeeping/watchdog chip.
This driver can also be built as a module. If so, the module
will be called rtc-ds1511.
config RTC_DRV_DS1553
tristate "Maxim/Dallas DS1553"
depends on HAS_IOMEM
help
If you say yes here you get support for the
Maxim/Dallas DS1553 timekeeping chip.
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
help
If you say yes here you get support for the
Maxim/Dallas DS1742/1743 timekeeping chip.
This driver can also be built as a module. If so, the module
will be called rtc-ds1742.
config RTC_DRV_DS2404
tristate "Maxim/Dallas DS2404"
help
If you say yes here you get support for the
Dallas DS2404 RTC chip.
This driver can also be built as a module. If so, the module
will be called rtc-ds2404.
config RTC_DRV_DA9052
tristate "Dialog DA9052/DA9053 RTC"
depends on PMIC_DA9052
help
Say y here to support the RTC driver for Dialog Semiconductor
DA9052-BC and DA9053-AA/Bx PMICs.
config RTC_DRV_DA9055
tristate "Dialog Semiconductor DA9055 RTC"
depends on MFD_DA9055
help
If you say yes here you will get support for the
RTC of the Dialog DA9055 PMIC.
This driver can also be built as a module. If so, the module
will be called rtc-da9055
config RTC_DRV_DA9063
tristate "Dialog Semiconductor DA9063/DA9062 RTC"
depends on MFD_DA9063 || MFD_DA9062
help
If you say yes here you will get support for the RTC subsystem
for the Dialog Semiconductor PMIC chips DA9063 and DA9062.
This driver can also be built as a module. If so, the module
will be called "rtc-da9063".
config RTC_DRV_EFI
tristate "EFI RTC"
depends on EFI && !X86
help
If you say yes here you will get support for the EFI
Real Time Clock.
This driver can also be built as a module. If so, the module
will be called rtc-efi.
config RTC_DRV_STK17TA8
tristate "Simtek STK17TA8"
depends on HAS_IOMEM
help
If you say yes here you get support for the
Simtek STK17TA8 timekeeping chip.
This driver can also be built as a module. If so, the module
will be called rtc-stk17ta8.
config RTC_DRV_M48T86
tristate "ST M48T86/Dallas DS12887"
help
If you say Y here you will get support for the
ST M48T86 and Dallas DS12887 RTC chips.
This driver can also be built as a module. If so, the module
will be called rtc-m48t86.
config RTC_DRV_M48T35
tristate "ST M48T35"
depends on HAS_IOMEM
help
If you say Y here you will get support for the
ST M48T35 RTC chip.
This driver can also be built as a module, if so, the module
will be called "rtc-m48t35".
config RTC_DRV_M48T59
tristate "ST M48T59/M48T08/M48T02"
depends on HAS_IOMEM
help
If you say Y here you will get support for the