## 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" 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_88PM860X tristate "Marvell 88PM860x" depends on RTC_CLASS && I2C && 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_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" 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_DS3232 tristate "Dallas/Maxim DS3232" depends on RTC_CLASS && I2C 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_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_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_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_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 M41T62/65/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: M41T62, 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_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 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/TWL6030/TPS659x0" depends on RTC_CLASS && 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_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. 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_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. 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_VRTCLines 1–500 of 1073. Load more
# # 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" 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_88PM860X tristate "Marvell 88PM860x" depends on RTC_CLASS && I2C && 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_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" 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_DS3232 tristate "Dallas/Maxim DS3232" depends on RTC_CLASS && I2C 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_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_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_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_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 M41T62/65/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: M41T62, 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_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 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/TWL6030/TPS659x0" depends on RTC_CLASS && 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_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. 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_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. 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_VRTC