2 # RTC class/drivers configuration
9 tristate "Real Time Clock"
14 Generic RTC class support. If you say yes here, you will
15 be allowed to plug one or more RTCs to your system. You will
16 probably want to enable one or more of the interfaces below.
18 This driver can also be built as a module. If so, the module
19 will be called rtc-core.
24 bool "Set system time from RTC on startup and resume"
25 depends on RTC_CLASS = y
28 If you say yes here, the system time (wall clock) will be set using
29 the value read from a specified RTC device. This is useful to avoid
30 unnecessary fsck runs at boot time, and to network better.
32 config RTC_HCTOSYS_DEVICE
33 string "RTC used to set the system time"
34 depends on RTC_HCTOSYS = y
37 The RTC device that will be used to (re)initialize the system
38 clock, usually rtc0. Initialization is done when the system
39 starts up, and when it resumes from a low power state. This
40 device should record time in UTC, since the kernel won't do
43 The driver for this RTC device must be loaded before late_initcall
44 functions run, so it must usually be statically linked.
46 This clock should be battery-backed, so that it reads the correct
47 time when the system boots from a power-off state. Otherwise, your
48 system will need an external clock source (like an NTP server).
50 If the clock you specify here is not battery backed, it may still
51 be useful to reinitialize system time when resuming from system
52 sleep states. Do not specify an RTC here unless it stays powered
53 during all this system's supported sleep states.
56 bool "RTC debug support"
57 depends on RTC_CLASS = y
59 Say yes here to enable debugging support in the RTC framework
60 and individual RTC drivers.
62 comment "RTC interfaces"
65 boolean "/sys/class/rtc/rtcN (sysfs)"
69 Say yes here if you want to use your RTCs using sysfs interfaces,
70 /sys/class/rtc/rtc0 through /sys/.../rtcN.
75 boolean "/proc/driver/rtc (procfs for rtc0)"
79 Say yes here if you want to use your first RTC through the proc
80 interface, /proc/driver/rtc. Other RTCs will not be available
86 boolean "/dev/rtcN (character devices)"
89 Say yes here if you want to use your RTCs using the /dev
90 interfaces, which "udev" sets up as /dev/rtc0 through
93 You may want to set up a symbolic link so one of these
94 can be accessed as /dev/rtc, which is a name
95 expected by "hwclock" and some other programs. Recent
96 versions of "udev" are known to set up the symlink for you.
100 config RTC_INTF_DEV_UIE_EMUL
101 bool "RTC UIE emulation on dev interface"
102 depends on RTC_INTF_DEV
104 Provides an emulation for RTC_UIE if the underlying rtc chip
105 driver does not expose RTC_UIE ioctls. Those requests generate
106 once-per-second update interrupts, used for synchronization.
108 The emulation code will read the time from the hardware
109 clock several times per second, please enable this option
110 only if you know that you really need it.
113 tristate "Test driver/device"
115 If you say yes here you get support for the
116 RTC test driver. It's a software RTC which can be
117 used to test the RTC subsystem APIs. It gets
118 the time from the system clock.
119 You want this driver only if you are doing development
120 on the RTC subsystem. Please read the source code
123 This driver can also be built as a module. If so, the module
124 will be called rtc-test.
126 comment "I2C RTC drivers"
131 config RTC_DRV_DS1307
132 tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
134 If you say yes here you get support for various compatible RTC
135 chips (often with battery backup) connected with I2C. This driver
136 should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
137 EPSON RX-8025 and probably other chips. In some cases the RTC
138 must already have been initialized (by manufacturing or a
141 The first seven registers on these chips hold an RTC, and other
142 registers may add features such as NVRAM, a trickle charger for
143 the RTC/NVRAM backup power, and alarms. NVRAM is visible in
144 sysfs, but other chip features may not be available.
146 This driver can also be built as a module. If so, the module
147 will be called rtc-ds1307.
149 config RTC_DRV_DS1374
150 tristate "Dallas/Maxim DS1374"
151 depends on RTC_CLASS && I2C
153 If you say yes here you get support for Dallas Semiconductor
154 DS1374 real-time clock chips. If an interrupt is associated
155 with the device, the alarm functionality is supported.
157 This driver can also be built as a module. If so, the module
158 will be called rtc-ds1374.
160 config RTC_DRV_DS1672
161 tristate "Dallas/Maxim DS1672"
163 If you say yes here you get support for the
164 Dallas/Maxim DS1672 timekeeping chip.
166 This driver can also be built as a module. If so, the module
167 will be called rtc-ds1672.
169 config RTC_DRV_MAX6900
170 tristate "Maxim MAX6900"
172 If you say yes here you will get support for the
173 Maxim MAX6900 I2C RTC chip.
175 This driver can also be built as a module. If so, the module
176 will be called rtc-max6900.
178 config RTC_DRV_RS5C372
179 tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
181 If you say yes here you get support for the
182 Ricoh R2025S/D, RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
184 This driver can also be built as a module. If so, the module
185 will be called rtc-rs5c372.
187 config RTC_DRV_ISL1208
188 tristate "Intersil ISL1208"
190 If you say yes here you get support for the
191 Intersil ISL1208 RTC chip.
193 This driver can also be built as a module. If so, the module
194 will be called rtc-isl1208.
197 tristate "Xicor/Intersil X1205"
199 If you say yes here you get support for the
200 Xicor/Intersil X1205 RTC chip.
202 This driver can also be built as a module. If so, the module
203 will be called rtc-x1205.
205 config RTC_DRV_PCF8563
206 tristate "Philips PCF8563/Epson RTC8564"
208 If you say yes here you get support for the
209 Philips PCF8563 RTC chip. The Epson RTC8564
212 This driver can also be built as a module. If so, the module
213 will be called rtc-pcf8563.
215 config RTC_DRV_PCF8583
216 tristate "Philips PCF8583"
218 If you say yes here you get support for the Philips PCF8583
219 RTC chip found on Acorn RiscPCs. This driver supports the
220 platform specific method of retrieving the current year from
221 the RTC's SRAM. It will work on other platforms with the same
222 chip, but the year will probably have to be tweaked.
224 This driver can also be built as a module. If so, the module
225 will be called rtc-pcf8583.
227 config RTC_DRV_M41T80
228 tristate "ST M41T62/65/M41T80/81/82/83/84/85/87"
230 If you say Y here you will get support for the ST M41T60
231 and M41T80 RTC chips series. Currently, the following chips are
232 supported: M41T62, M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
233 M41ST85, and M41ST87.
235 This driver can also be built as a module. If so, the module
236 will be called rtc-m41t80.
238 config RTC_DRV_M41T80_WDT
239 bool "ST M41T65/M41T80 series RTC watchdog timer"
240 depends on RTC_DRV_M41T80
242 If you say Y here you will get support for the
243 watchdog timer in the ST M41T60 and M41T80 RTC chips series.
245 config RTC_DRV_DM355EVM
246 tristate "TI DaVinci DM355 EVM RTC"
247 depends on MFD_DM355EVM_MSP
249 Supports the RTC firmware in the MSP430 on the DM355 EVM.
251 config RTC_DRV_TWL92330
252 boolean "TI TWL92330/Menelaus"
255 If you say yes here you get support for the RTC on the
256 TWL92330 "Menelaus" power management chip, used with OMAP2
257 platforms. The support is integrated with the rest of
258 the Menelaus driver; it's not separate module.
260 config RTC_DRV_TWL4030
261 tristate "TI TWL4030/TWL5030/TPS659x0"
262 depends on RTC_CLASS && TWL4030_CORE
264 If you say yes here you get support for the RTC on the
265 TWL4030 family chips, used mostly with OMAP3 platforms.
267 This driver can also be built as a module. If so, the module
268 will be called rtc-twl4030.
270 config RTC_DRV_S35390A
271 tristate "Seiko Instruments S-35390A"
274 If you say yes here you will get support for the Seiko
275 Instruments S-35390A.
277 This driver can also be built as a module. If so the module
278 will be called rtc-s35390a.
280 config RTC_DRV_FM3130
281 tristate "Ramtron FM3130"
283 If you say Y here you will get support for the
284 Ramtron FM3130 RTC chips.
285 Ramtron FM3130 is a chip with two separate devices inside,
286 RTC clock and FRAM. This driver provides only RTC functionality.
288 This driver can also be built as a module. If so the module
289 will be called rtc-fm3130.
291 config RTC_DRV_RX8581
292 tristate "Epson RX-8581"
294 If you say yes here you will get support for the Epson RX-8581.
296 This driver can also be built as a module. If so the module
297 will be called rtc-rx8581.
301 comment "SPI RTC drivers"
305 config RTC_DRV_M41T94
308 If you say yes here you will get support for the
309 ST M41T94 SPI RTC chip.
311 This driver can also be built as a module. If so, the module
312 will be called rtc-m41t94.
314 config RTC_DRV_DS1305
315 tristate "Dallas/Maxim DS1305/DS1306"
317 Select this driver to get support for the Dallas/Maxim DS1305
318 and DS1306 real time clock chips. These support a trickle
319 charger, alarms, and NVRAM in addition to the clock.
321 This driver can also be built as a module. If so, the module
322 will be called rtc-ds1305.
324 config RTC_DRV_DS1390
325 tristate "Dallas/Maxim DS1390/93/94"
327 If you say yes here you get support for the
328 Dallas/Maxim DS1390/93/94 chips.
330 This driver only supports the RTC feature, and not other chip
331 features such as alarms and trickle charging.
333 This driver can also be built as a module. If so, the module
334 will be called rtc-ds1390.
336 config RTC_DRV_MAX6902
337 tristate "Maxim MAX6902"
339 If you say yes here you will get support for the
340 Maxim MAX6902 SPI RTC chip.
342 This driver can also be built as a module. If so, the module
343 will be called rtc-max6902.
346 tristate "Epson RTC-9701JE"
348 If you say yes here you will get support for the
349 Epson RTC-9701JE SPI RTC chip.
351 This driver can also be built as a module. If so, the module
352 will be called rtc-r9701.
354 config RTC_DRV_RS5C348
355 tristate "Ricoh RS5C348A/B"
357 If you say yes here you get support for the
358 Ricoh RS5C348A and RS5C348B RTC chips.
360 This driver can also be built as a module. If so, the module
361 will be called rtc-rs5c348.
363 config RTC_DRV_DS3234
364 tristate "Maxim/Dallas DS3234"
366 If you say yes here you get support for the
367 Maxim/Dallas DS3234 SPI RTC chip.
369 This driver can also be built as a module. If so, the module
370 will be called rtc-ds3234.
374 comment "Platform RTC drivers"
376 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
377 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
378 # global rtc_lock ... it's not yet just another platform_device.
381 tristate "PC-style 'CMOS'"
382 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC64
385 Say "yes" here to get direct support for the real time clock
386 found in every PC or ACPI-based system, and some other boards.
387 Specifically the original MC146818, compatibles like those in
388 PC south bridges, the DS12887 or M48T86, some multifunction
389 or LPC bus chips, and so on.
391 Your system will need to define the platform device used by
392 this driver, otherwise it won't be accessible. This means
393 you can safely enable this driver if you don't know whether
394 or not your board has this kind of hardware.
396 This driver can also be built as a module. If so, the module
397 will be called rtc-cmos.
399 config RTC_DRV_DS1216
400 tristate "Dallas DS1216"
403 If you say yes here you get support for the Dallas DS1216 RTC chips.
405 config RTC_DRV_DS1286
406 tristate "Dallas DS1286"
408 If you say yes here you get support for the Dallas DS1286 RTC chips.
410 config RTC_DRV_DS1302
411 tristate "Dallas DS1302"
412 depends on SH_SECUREEDGE5410
414 If you say yes here you get support for the Dallas DS1302 RTC chips.
416 config RTC_DRV_DS1511
417 tristate "Dallas DS1511"
420 If you say yes here you get support for the
421 Dallas DS1511 timekeeping/watchdog chip.
423 This driver can also be built as a module. If so, the module
424 will be called rtc-ds1511.
426 config RTC_DRV_DS1553
427 tristate "Maxim/Dallas DS1553"
429 If you say yes here you get support for the
430 Maxim/Dallas DS1553 timekeeping chip.
432 This driver can also be built as a module. If so, the module
433 will be called rtc-ds1553.
435 config RTC_DRV_DS1742
436 tristate "Maxim/Dallas DS1742/1743"
438 If you say yes here you get support for the
439 Maxim/Dallas DS1742/1743 timekeeping chip.
441 This driver can also be built as a module. If so, the module
442 will be called rtc-ds1742.
448 If you say yes here you will get support for the EFI
451 This driver can also be built as a module. If so, the module
452 will be called rtc-efi.
454 config RTC_DRV_STK17TA8
455 tristate "Simtek STK17TA8"
458 If you say yes here you get support for the
459 Simtek STK17TA8 timekeeping chip.
461 This driver can also be built as a module. If so, the module
462 will be called rtc-stk17ta8.
464 config RTC_DRV_M48T86
465 tristate "ST M48T86/Dallas DS12887"
467 If you say Y here you will get support for the
468 ST M48T86 and Dallas DS12887 RTC chips.
470 This driver can also be built as a module. If so, the module
471 will be called rtc-m48t86.
473 config RTC_DRV_M48T35
476 If you say Y here you will get support for the
479 This driver can also be built as a module, if so, the module
480 will be called "rtc-m48t35".
482 config RTC_DRV_M48T59
483 tristate "ST M48T59/M48T08/M48T02"
485 If you say Y here you will get support for the
486 ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
488 These chips are usually found in Sun SPARC and UltraSPARC
491 This driver can also be built as a module, if so, the module
492 will be called "rtc-m48t59".
494 config RTC_DRV_BQ4802
497 If you say Y here you will get support for the TI
500 This driver can also be built as a module. If so, the module
501 will be called rtc-bq4802.
504 tristate "EM Microelectronic V3020"
506 If you say yes here you will get support for the
507 EM Microelectronic v3020 RTC chip.
509 This driver can also be built as a module. If so, the module
510 will be called rtc-v3020.
512 config RTC_DRV_WM8350
513 tristate "Wolfson Microelectronics WM8350 RTC"
514 depends on MFD_WM8350
516 If you say yes here you will get support for the RTC subsystem
517 of the Wolfson Microelectronics WM8350.
519 This driver can also be built as a module. If so, the module
520 will be called "rtc-wm8350".
522 config RTC_DRV_PCF50633
523 depends on MFD_PCF50633
524 tristate "NXP PCF50633 RTC"
526 If you say yes here you get support for the RTC subsystem of the
527 NXP PCF50633 used in embedded systems.
529 comment "on-CPU RTC drivers"
533 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
535 Say "yes" here to support the real time clock on TI OMAP1 chips.
536 This driver can also be built as a module called rtc-omap.
539 tristate "Samsung S3C series SoC RTC"
540 depends on ARCH_S3C2410
542 RTC (Realtime Clock) driver for the clock inbuilt into the
543 Samsung S3C24XX series of SoCs. This can provide periodic
544 interrupt rates from 1Hz to 64Hz for user programs, and
547 The driver currently supports the common features on all the
548 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
551 This driver can also be build as a module. If so, the module
552 will be called rtc-s3c.
554 config RTC_DRV_EP93XX
555 tristate "Cirrus Logic EP93XX"
556 depends on ARCH_EP93XX
558 If you say yes here you get support for the
559 RTC embedded in the Cirrus Logic EP93XX processors.
561 This driver can also be built as a module. If so, the module
562 will be called rtc-ep93xx.
564 config RTC_DRV_SA1100
565 tristate "SA11x0/PXA2xx"
566 depends on ARCH_SA1100 || ARCH_PXA
568 If you say Y here you will get access to the real time clock
569 built into your SA11x0 or PXA2xx CPU.
571 To compile this driver as a module, choose M here: the
572 module will be called rtc-sa1100.
575 tristate "SuperH On-Chip RTC"
576 depends on RTC_CLASS && SUPERH && HAVE_CLK
578 Say Y here to enable support for the on-chip RTC found in
579 most SuperH processors.
581 To compile this driver as a module, choose M here: the
582 module will be called rtc-sh.
584 config RTC_DRV_VR41XX
585 tristate "NEC VR41XX"
586 depends on CPU_VR41XX
588 If you say Y here you will get access to the real time clock
589 built into your NEC VR41XX CPU.
591 To compile this driver as a module, choose M here: the
592 module will be called rtc-vr41xx.
595 tristate "ARM AMBA PL030 RTC"
598 If you say Y here you will get access to ARM AMBA
599 PrimeCell PL030 RTC found on certain ARM SOCs.
601 To compile this driver as a module, choose M here: the
602 module will be called rtc-pl030.
605 tristate "ARM AMBA PL031 RTC"
608 If you say Y here you will get access to ARM AMBA
609 PrimeCell PL031 RTC found on certain ARM SOCs.
611 To compile this driver as a module, choose M here: the
612 module will be called rtc-pl031.
614 config RTC_DRV_AT32AP700X
615 tristate "AT32AP700X series RTC"
616 depends on PLATFORM_AT32AP
618 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
619 AT32AP700x family processors.
621 config RTC_DRV_AT91RM9200
622 tristate "AT91RM9200 or AT91SAM9RL"
623 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
625 Driver for the internal RTC (Realtime Clock) module found on
626 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
627 this is powered by the backup power supply.
629 config RTC_DRV_AT91SAM9
630 tristate "AT91SAM9x/AT91CAP9"
631 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
633 RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
634 (Real Time Timer). These timers are powered by the backup power
635 supply (such as a small coin cell battery), but do not need to
638 (On AT91SAM9rl chips you probably want to use the dedicated RTC
639 module and leave the RTT available for other uses.)
641 config RTC_DRV_AT91SAM9_RTT
645 prompt "RTT module Number" if ARCH_AT91SAM9263
646 depends on RTC_DRV_AT91SAM9
648 More than one RTT module is available. You can choose which
649 one will be used as an RTC. The default of zero is normally
650 OK to use, though some systems use that for non-RTC purposes.
652 config RTC_DRV_AT91SAM9_GPBR
654 range 0 3 if !ARCH_AT91SAM9263
655 range 0 15 if ARCH_AT91SAM9263
657 prompt "Backup Register Number"
658 depends on RTC_DRV_AT91SAM9
660 The RTC driver needs to use one of the General Purpose Backup
661 Registers (GPBRs) as well as the RTT. You can choose which one
662 will be used. The default of zero is normally OK to use, but
663 on some systems other software needs to use that register.
665 config RTC_DRV_AU1XXX
666 tristate "Au1xxx Counter0 RTC support"
667 depends on SOC_AU1X00
669 This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
670 counter) to be used as a RTC.
672 This driver can also be built as a module. If so, the module
673 will be called rtc-au1xxx.
676 tristate "Blackfin On-Chip RTC"
677 depends on BLACKFIN && !BF561
679 If you say yes here you will get support for the
680 Blackfin On-Chip Real Time Clock.
682 This driver can also be built as a module. If so, the module
683 will be called rtc-bfin.
685 config RTC_DRV_RS5C313
686 tristate "Ricoh RS5C313"
687 depends on SH_LANDISK
689 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
691 config RTC_DRV_GENERIC
692 tristate "Generic RTC support"
693 # Please consider writing a new RTC driver instead of using the generic
695 depends on PARISC || M68K || PPC || SUPERH32
697 Say Y or M here to enable RTC support on systems using the generic
698 RTC abstraction. If you do not know what you are doing, you should
702 tristate "PXA27x/PXA3xx"
705 If you say Y here you will get access to the real time clock
706 built into your PXA27x or PXA3xx CPU.
708 This RTC driver uses PXA RTC registers available since pxa27x
709 series (RDxR, RYxR) instead of legacy RCNR, RTAR.
713 bool "SUN4V Hypervisor RTC"
716 If you say Y here you will get support for the Hypervisor
717 based RTC on SUN4V systems.
719 config RTC_DRV_STARFIRE
723 If you say Y here you will get support for the RTC found on
726 config RTC_DRV_TX4939
727 tristate "TX4939 SoC"
728 depends on SOC_TX4939
730 Driver for the internal RTC (Realtime Clock) module found on
734 tristate "Marvell SoC RTC"
735 depends on ARCH_KIRKWOOD
737 If you say yes here you will get support for the in-chip RTC
738 that can be found in some of Marvell's SoC devices, such as
739 the Kirkwood 88F6281 and 88F6192.
741 This driver can also be built as a module. If so, the module
742 will be called rtc-mv.
748 If you say yes here you will get support for the RTC on PS3.
750 This driver can also be built as a module. If so, the module
751 will be called rtc-ps3.