## RTC class/drivers configuration# menu "Real Time Clock" config RTC_LIB	tristate config RTC_CLASS	tristate "RTC class"	depends on EXPERIMENTAL	default n	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-class. config RTC_HCTOSYS	bool "Set system time from RTC on startup"	depends on RTC_CLASS = y	default y	help	  If you say yes here, the system time will be set using	  the value read from the specified RTC device. This is useful	  in order to avoid unnecessary fsck runs. config RTC_HCTOSYS_DEVICE	string "The RTC to read the time from"	depends on RTC_HCTOSYS = y	default "rtc0"	help	  The RTC device that will be used as the source for	  the system time, usually rtc0. 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"	depends on RTC_CLASS config RTC_INTF_SYSFS	tristate "sysfs"	depends on RTC_CLASS && 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. 	  This driver can also be built as a module. If so, the module	  will be called rtc-sysfs. config RTC_INTF_PROC	tristate "proc"	depends on RTC_CLASS && 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. 	  This driver can also be built as a module. If so, the module	  will be called rtc-proc. config RTC_INTF_DEV	tristate "dev"	depends on RTC_CLASS	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. 	  This driver can also be built as a module. If so, the module	  will be called rtc-dev. 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 underlaying rtc chip	  driver does not expose RTC_UIE ioctls.  Those requests generate	  once-per-second update interrupts, used for synchronization. comment "RTC drivers"	depends on RTC_CLASS # 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' real time clock"	depends on RTC_CLASS && (X86 || ALPHA || ARM26 || ARM \		|| M32R || ATARI || POWERPC)	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_X1205	tristate "Xicor/Intersil X1205"	depends on RTC_CLASS && I2C	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_DS1307	tristate "Dallas/Maxim DS1307 and similar I2C RTC chips"	depends on RTC_CLASS && I2C	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.  This driver may not	  expose all those available chip features. 	  This driver can also be built as a module. If so, the module	  will be called rtc-ds1307. config RTC_DRV_DS1553	tristate "Dallas DS1553"	depends on RTC_CLASS	help	  If you say yes here you get support for the	  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_ISL1208	tristate "Intersil 1208"	depends on RTC_CLASS && I2C	help	  If you say yes here you get support for the	  Intersil 1208 RTC chip. 	  This driver can also be built as a module. If so, the module	  will be called rtc-isl1208. config RTC_DRV_DS1672	tristate "Dallas/Maxim DS1672"	depends on RTC_CLASS && I2C	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_DS1742	tristate "Dallas DS1742/1743"	depends on RTC_CLASS	help	  If you say yes here you get support for the	  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_OMAP	tristate "TI OMAP1"	depends on RTC_CLASS && ( \		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_PCF8563	tristate "Philips PCF8563/Epson RTC8564"	depends on RTC_CLASS && I2C	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"	depends on RTC_CLASS && I2C && ARCH_RPC	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. 	  This driver can also be built as a module. If so, the module	  will be called rtc-pcf8583. config RTC_DRV_RS5C348	tristate "Ricoh RS5C348A/B"	depends on RTC_CLASS && SPI	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_RS5C372	tristate "Ricoh RS5C372A/B"	depends on RTC_CLASS && I2C	help	  If you say yes here you get support for the	  Ricoh RS5C372A and RS5C372B RTC chips. 	  This driver can also be built as a module. If so, the module	  will be called rtc-rs5c372. config RTC_DRV_S3C	tristate "Samsung S3C series SoC RTC"	depends on RTC_CLASS && 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_M48T86	tristate "ST M48T86/Dallas DS12887"	depends on RTC_CLASS	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_EP93XX	tristate "Cirrus Logic EP93XX"	depends on RTC_CLASS && 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 RTC_CLASS && (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 RTC_CLASS && 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_PL031	tristate "ARM AMBA PL031 RTC"	depends on RTC_CLASS && ARM_AMBA	help	  If you say Y here you will get access to ARM AMBA	  PrimeCell PL031 UART 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_AT91RM9200	tristate "AT91RM9200"	depends on RTC_CLASS && ARCH_AT91RM9200	help	  Driver for the Atmel AT91RM9200's internal RTC (Realtime Clock). config RTC_DRV_TEST	tristate "Test driver/device"	depends on RTC_CLASS	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. config RTC_DRV_MAX6902	tristate "Maxim 6902"	depends on RTC_CLASS && SPI	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_V3020	tristate "EM Microelectronic V3020"	depends on RTC_CLASS	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. endmenu