[safe/jmp/linux-2.6] / drivers / rtc / Kconfig

#
# RTC class/drivers configuration
#

config RTC_LIB
        tristate

menuconfig RTC_CLASS
        tristate "Real Time Clock"
        default n
        depends on !S390
        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.

          This driver can also be built as a module. If so, the module
          will be called rtc-core.

if RTC_CLASS

config RTC_HCTOSYS
        bool "Set system time from RTC on startup and resume"
        depends on RTC_CLASS = y
        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 = y
        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_DEBUG
        bool "RTC debug support"
        depends on RTC_CLASS = y
        help
          Say yes here to enable debugging support in the RTC framework
          and individual RTC drivers.

comment "RTC interfaces"

config RTC_INTF_SYSFS
        boolean "/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
        boolean "/proc/driver/rtc (procfs for rtc0)"
        depends on PROC_FS
        default RTC_CLASS
        help
          Say yes here if you want to use your first RTC through the proc
          interface, /proc/driver/rtc. Other RTCs will not be available
          through that API.

          If unsure, say Y.

config RTC_INTF_DEV
        boolean "/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_DS1307
        tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00"
        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,
          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"
        depends on RTC_CLASS && I2C
        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_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_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_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_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_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_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 M41T65/M41T80/81/82/83/84/85/87"
        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: M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
          M41ST85, and M41ST87.

          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_TWL92330
        boolean "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/TPS659x0"
        depends on RTC_CLASS && TWL4030_CORE
        help
          If you say yes here you get support for the RTC on the
          TWL4030 family chips, used mostly with OMAP3 platforms.

          This driver can also be built as a module. If so, the module
          will be called rtc-twl4030.

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.

endif # I2C

comment "SPI RTC drivers"

if SPI_MASTER

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_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.

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 || ALPHA || ARM || M32R || ATARI || 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_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"
        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 RTC_CLASS
        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"
        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_DS1742
        tristate "Maxim/Dallas DS1742/1743"
        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_STK17TA8
        tristate "Simtek STK17TA8"
        depends on RTC_CLASS
        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"
        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"
        help
          If you say Y here you will get support for the
          ST M48T59 RTC chip and compatible ST M48T08 and M48T02.

          These chips are usually found in Sun SPARC and UltraSPARC
          workstations.

          This driver can also be built as a module, if so, the module
          will be called "rtc-m48t59".

config RTC_DRV_BQ4802
        tristate "TI BQ4802"
        help
          If you say Y here you will get support for the TI
          BQ4802 RTC chip.

          This driver can also be built as a module. If so, the module
          will be called rtc-bq4802.

config RTC_DRV_V3020
        tristate "EM Microelectronic V3020"
        help
          If you say yes here you will get support for the
          EM Microelectronic v3020 RTC chip.

          This driver can also be built as a module. If so, the module
          will be called rtc-v3020.

config RTC_DRV_WM8350
        tristate "Wolfson Microelectronics WM8350 RTC"
        depends on MFD_WM8350
        help
          If you say yes here you will get support for the RTC subsystem
          of the Wolfson Microelectronics WM8350.

          This driver can also be built as a module. If so, the module
          will be called "rtc-wm8350".

comment "on-CPU RTC drivers"

config RTC_DRV_OMAP
        tristate "TI OMAP1"
        depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
        help
          Say "yes" here to support the real time clock on TI OMAP1 chips.
          This driver can also be built as a module called rtc-omap.

config RTC_DRV_S3C
        tristate "Samsung S3C series SoC RTC"
        depends on ARCH_S3C2410
        help
          RTC (Realtime Clock) driver for the clock inbuilt into the
          Samsung S3C24XX series of SoCs. This can provide periodic
          interrupt rates from 1Hz to 64Hz for user programs, and
          wakeup from Alarm.

          The driver currently supports the common features on all the
          S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
          and S3C2442.

          This driver can also be build as a module. If so, the module
          will be called rtc-s3c.

config RTC_DRV_EP93XX
        tristate "Cirrus Logic EP93XX"
        depends on ARCH_EP93XX
        help
          If you say yes here you get support for the
          RTC embedded in the Cirrus Logic EP93XX processors.

          This driver can also be built as a module. If so, the module
          will be called rtc-ep93xx.

config RTC_DRV_SA1100
        tristate "SA11x0/PXA2xx"
        depends on ARCH_SA1100 || ARCH_PXA
        help
          If you say Y here you will get access to the real time clock
          built into your SA11x0 or PXA2xx CPU.

          To compile this driver as a module, choose M here: the
          module will be called rtc-sa1100.

config RTC_DRV_SH
        tristate "SuperH On-Chip RTC"
        depends on RTC_CLASS && SUPERH
        help
          Say Y here to enable support for the on-chip RTC found in
          most SuperH processors.

          To compile this driver as a module, choose M here: the
          module will be called rtc-sh.

config RTC_DRV_VR41XX
        tristate "NEC VR41XX"
        depends on CPU_VR41XX
        help
          If you say Y here you will get access to the real time clock
          built into your NEC VR41XX CPU.

          To compile this driver as a module, choose M here: the
          module will be called rtc-vr41xx.

config RTC_DRV_PL030
        tristate "ARM AMBA PL030 RTC"
        depends on ARM_AMBA
        help
          If you say Y here you will get access to ARM AMBA
          PrimeCell PL030 RTC found on certain ARM SOCs.

          To compile this driver as a module, choose M here: the
          module will be called rtc-pl030.

config RTC_DRV_PL031
        tristate "ARM AMBA PL031 RTC"
        depends on ARM_AMBA
        help
          If you say Y here you will get access to ARM AMBA
          PrimeCell PL031 RTC found on certain ARM SOCs.

          To compile this driver as a module, choose M here: the
          module will be called rtc-pl031.

config RTC_DRV_AT32AP700X
        tristate "AT32AP700X series RTC"
        depends on PLATFORM_AT32AP
        help
          Driver for the internal RTC (Realtime Clock) on Atmel AVR32
          AT32AP700x family processors.

config RTC_DRV_AT91RM9200
        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/AT91CAP9"
        depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
        help
          RTC driver for the Atmel AT91SAM9x and AT91CAP9 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_AU1XXX
        tristate "Au1xxx Counter0 RTC support"
        depends on SOC_AU1X00
        help
          This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
          counter) to be used as a RTC.

          This driver can also be built as a module. If so, the module
          will be called rtc-au1xxx.

config RTC_DRV_BFIN
        tristate "Blackfin On-Chip RTC"
        depends on BLACKFIN && !BF561
        help
          If you say yes here you will get support for the
          Blackfin On-Chip Real Time Clock.

          This driver can also be built as a module. If so, the module
          will be called rtc-bfin.

config RTC_DRV_RS5C313
        tristate "Ricoh RS5C313"
        depends on SH_LANDISK
        help
          If you say yes here you get support for the Ricoh RS5C313 RTC chips.

config RTC_DRV_PARISC
        tristate "PA-RISC firmware RTC support"
        depends on PARISC
        help
          Say Y or M here to enable RTC support on PA-RISC systems using
          firmware calls. If you do not know what you are doing, you should
          just say Y.

config RTC_DRV_PPC
       tristate "PowerPC machine dependent RTC support"
       depends on PPC
       help
         The PowerPC kernel has machine-specific functions for accessing
         the RTC. This exposes that functionality through the generic RTC
         class.

config RTC_DRV_PXA
       tristate "PXA27x/PXA3xx"
       depends on ARCH_PXA
       help
         If you say Y here you will get access to the real time clock
         built into your PXA27x or PXA3xx CPU.

         This RTC driver uses PXA RTC registers available since pxa27x
         series (RDxR, RYxR) instead of legacy RCNR, RTAR.


config RTC_DRV_SUN4V
        bool "SUN4V Hypervisor RTC"
        depends on SPARC64
        help
          If you say Y here you will get support for the Hypervisor
          based RTC on SUN4V systems.

config RTC_DRV_STARFIRE
        bool "Starfire RTC"
        depends on SPARC64
        help
          If you say Y here you will get support for the RTC found on
          Starfire systems.

endif # RTC_CLASS