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.
299 config RTC_DRV_RX8025
300 tristate "Epson RX-8025SA/NB"
302 If you say yes here you get support for the Epson
303 RX-8025SA/NB RTC chips.
305 This driver can also be built as a module. If so, the module
306 will be called rtc-rx8025.
310 comment "SPI RTC drivers"
314 config RTC_DRV_M41T94
317 If you say yes here you will get support for the
318 ST M41T94 SPI RTC chip.
320 This driver can also be built as a module. If so, the module
321 will be called rtc-m41t94.
323 config RTC_DRV_DS1305
324 tristate "Dallas/Maxim DS1305/DS1306"
326 Select this driver to get support for the Dallas/Maxim DS1305
327 and DS1306 real time clock chips. These support a trickle
328 charger, alarms, and NVRAM in addition to the clock.
330 This driver can also be built as a module. If so, the module
331 will be called rtc-ds1305.
333 config RTC_DRV_DS1390
334 tristate "Dallas/Maxim DS1390/93/94"
336 If you say yes here you get support for the
337 Dallas/Maxim DS1390/93/94 chips.
339 This driver only supports the RTC feature, and not other chip
340 features such as alarms and trickle charging.
342 This driver can also be built as a module. If so, the module
343 will be called rtc-ds1390.
345 config RTC_DRV_MAX6902
346 tristate "Maxim MAX6902"
348 If you say yes here you will get support for the
349 Maxim MAX6902 SPI RTC chip.
351 This driver can also be built as a module. If so, the module
352 will be called rtc-max6902.
355 tristate "Epson RTC-9701JE"
357 If you say yes here you will get support for the
358 Epson RTC-9701JE SPI RTC chip.
360 This driver can also be built as a module. If so, the module
361 will be called rtc-r9701.
363 config RTC_DRV_RS5C348
364 tristate "Ricoh RS5C348A/B"
366 If you say yes here you get support for the
367 Ricoh RS5C348A and RS5C348B RTC chips.
369 This driver can also be built as a module. If so, the module
370 will be called rtc-rs5c348.
372 config RTC_DRV_DS3234
373 tristate "Maxim/Dallas DS3234"
375 If you say yes here you get support for the
376 Maxim/Dallas DS3234 SPI RTC chip.
378 This driver can also be built as a module. If so, the module
379 will be called rtc-ds3234.
381 config RTC_DRV_PCF2123
382 tristate "NXP PCF2123"
384 If you say yes here you get support for the NXP PCF2123
387 This driver can also be built as a module. If so, the module
388 will be called rtc-pcf2123.
392 comment "Platform RTC drivers"
394 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
395 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
396 # global rtc_lock ... it's not yet just another platform_device.
399 tristate "PC-style 'CMOS'"
400 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC64
403 Say "yes" here to get direct support for the real time clock
404 found in every PC or ACPI-based system, and some other boards.
405 Specifically the original MC146818, compatibles like those in
406 PC south bridges, the DS12887 or M48T86, some multifunction
407 or LPC bus chips, and so on.
409 Your system will need to define the platform device used by
410 this driver, otherwise it won't be accessible. This means
411 you can safely enable this driver if you don't know whether
412 or not your board has this kind of hardware.
414 This driver can also be built as a module. If so, the module
415 will be called rtc-cmos.
417 config RTC_DRV_DS1216
418 tristate "Dallas DS1216"
421 If you say yes here you get support for the Dallas DS1216 RTC chips.
423 config RTC_DRV_DS1286
424 tristate "Dallas DS1286"
426 If you say yes here you get support for the Dallas DS1286 RTC chips.
428 config RTC_DRV_DS1302
429 tristate "Dallas DS1302"
430 depends on SH_SECUREEDGE5410
432 If you say yes here you get support for the Dallas DS1302 RTC chips.
434 config RTC_DRV_DS1511
435 tristate "Dallas DS1511"
438 If you say yes here you get support for the
439 Dallas DS1511 timekeeping/watchdog chip.
441 This driver can also be built as a module. If so, the module
442 will be called rtc-ds1511.
444 config RTC_DRV_DS1553
445 tristate "Maxim/Dallas DS1553"
447 If you say yes here you get support for the
448 Maxim/Dallas DS1553 timekeeping chip.
450 This driver can also be built as a module. If so, the module
451 will be called rtc-ds1553.
453 config RTC_DRV_DS1742
454 tristate "Maxim/Dallas DS1742/1743"
456 If you say yes here you get support for the
457 Maxim/Dallas DS1742/1743 timekeeping chip.
459 This driver can also be built as a module. If so, the module
460 will be called rtc-ds1742.
466 If you say yes here you will get support for the EFI
469 This driver can also be built as a module. If so, the module
470 will be called rtc-efi.
472 config RTC_DRV_STK17TA8
473 tristate "Simtek STK17TA8"
476 If you say yes here you get support for the
477 Simtek STK17TA8 timekeeping chip.
479 This driver can also be built as a module. If so, the module
480 will be called rtc-stk17ta8.
482 config RTC_DRV_M48T86
483 tristate "ST M48T86/Dallas DS12887"
485 If you say Y here you will get support for the
486 ST M48T86 and Dallas DS12887 RTC chips.
488 This driver can also be built as a module. If so, the module
489 will be called rtc-m48t86.
491 config RTC_DRV_M48T35
494 If you say Y here you will get support for the
497 This driver can also be built as a module, if so, the module
498 will be called "rtc-m48t35".
500 config RTC_DRV_M48T59
501 tristate "ST M48T59/M48T08/M48T02"
503 If you say Y here you will get support for the
504 ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
506 These chips are usually found in Sun SPARC and UltraSPARC
509 This driver can also be built as a module, if so, the module
510 will be called "rtc-m48t59".
513 tristate "Freescale MXC Real Time Clock"
517 If you say yes here you get support for the Freescale MXC
520 This driver can also be built as a module, if so, the module
521 will be called "rtc-mxc".
523 config RTC_DRV_BQ4802
526 If you say Y here you will get support for the TI
529 This driver can also be built as a module. If so, the module
530 will be called rtc-bq4802.
533 tristate "EM Microelectronic V3020"
535 If you say yes here you will get support for the
536 EM Microelectronic v3020 RTC chip.
538 This driver can also be built as a module. If so, the module
539 will be called rtc-v3020.
541 config RTC_DRV_WM831X
542 tristate "Wolfson Microelectronics WM831x RTC"
543 depends on MFD_WM831X
545 If you say yes here you will get support for the RTC subsystem
546 of the Wolfson Microelectronics WM831X series PMICs.
548 This driver can also be built as a module. If so, the module
549 will be called "rtc-wm831x".
551 config RTC_DRV_WM8350
552 tristate "Wolfson Microelectronics WM8350 RTC"
553 depends on MFD_WM8350
555 If you say yes here you will get support for the RTC subsystem
556 of the Wolfson Microelectronics WM8350.
558 This driver can also be built as a module. If so, the module
559 will be called "rtc-wm8350".
561 config RTC_DRV_PCF50633
562 depends on MFD_PCF50633
563 tristate "NXP PCF50633 RTC"
565 If you say yes here you get support for the RTC subsystem of the
566 NXP PCF50633 used in embedded systems.
568 config RTC_DRV_AB3100
569 tristate "ST-Ericsson AB3100 RTC"
570 depends on AB3100_CORE
571 default y if AB3100_CORE
573 Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC
574 support. This chip contains a battery- and capacitor-backed RTC.
577 comment "on-CPU RTC drivers"
581 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
583 Say "yes" here to support the real time clock on TI OMAP1 chips.
584 This driver can also be built as a module called rtc-omap.
587 tristate "Samsung S3C series SoC RTC"
588 depends on ARCH_S3C2410
590 RTC (Realtime Clock) driver for the clock inbuilt into the
591 Samsung S3C24XX series of SoCs. This can provide periodic
592 interrupt rates from 1Hz to 64Hz for user programs, and
595 The driver currently supports the common features on all the
596 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
599 This driver can also be build as a module. If so, the module
600 will be called rtc-s3c.
602 config RTC_DRV_EP93XX
603 tristate "Cirrus Logic EP93XX"
604 depends on ARCH_EP93XX
606 If you say yes here you get support for the
607 RTC embedded in the Cirrus Logic EP93XX processors.
609 This driver can also be built as a module. If so, the module
610 will be called rtc-ep93xx.
612 config RTC_DRV_SA1100
613 tristate "SA11x0/PXA2xx"
614 depends on ARCH_SA1100 || ARCH_PXA
616 If you say Y here you will get access to the real time clock
617 built into your SA11x0 or PXA2xx CPU.
619 To compile this driver as a module, choose M here: the
620 module will be called rtc-sa1100.
623 tristate "SuperH On-Chip RTC"
624 depends on RTC_CLASS && SUPERH && HAVE_CLK
626 Say Y here to enable support for the on-chip RTC found in
627 most SuperH processors.
629 To compile this driver as a module, choose M here: the
630 module will be called rtc-sh.
632 config RTC_DRV_VR41XX
633 tristate "NEC VR41XX"
634 depends on CPU_VR41XX
636 If you say Y here you will get access to the real time clock
637 built into your NEC VR41XX CPU.
639 To compile this driver as a module, choose M here: the
640 module will be called rtc-vr41xx.
643 tristate "ARM AMBA PL030 RTC"
646 If you say Y here you will get access to ARM AMBA
647 PrimeCell PL030 RTC found on certain ARM SOCs.
649 To compile this driver as a module, choose M here: the
650 module will be called rtc-pl030.
653 tristate "ARM AMBA PL031 RTC"
656 If you say Y here you will get access to ARM AMBA
657 PrimeCell PL031 RTC found on certain ARM SOCs.
659 To compile this driver as a module, choose M here: the
660 module will be called rtc-pl031.
662 config RTC_DRV_AT32AP700X
663 tristate "AT32AP700X series RTC"
664 depends on PLATFORM_AT32AP
666 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
667 AT32AP700x family processors.
669 config RTC_DRV_AT91RM9200
670 tristate "AT91RM9200 or AT91SAM9RL"
671 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
673 Driver for the internal RTC (Realtime Clock) module found on
674 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
675 this is powered by the backup power supply.
677 config RTC_DRV_AT91SAM9
678 tristate "AT91SAM9x/AT91CAP9"
679 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
681 RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
682 (Real Time Timer). These timers are powered by the backup power
683 supply (such as a small coin cell battery), but do not need to
686 (On AT91SAM9rl chips you probably want to use the dedicated RTC
687 module and leave the RTT available for other uses.)
689 config RTC_DRV_AT91SAM9_RTT
693 prompt "RTT module Number" if ARCH_AT91SAM9263
694 depends on RTC_DRV_AT91SAM9
696 More than one RTT module is available. You can choose which
697 one will be used as an RTC. The default of zero is normally
698 OK to use, though some systems use that for non-RTC purposes.
700 config RTC_DRV_AT91SAM9_GPBR
702 range 0 3 if !ARCH_AT91SAM9263
703 range 0 15 if ARCH_AT91SAM9263
705 prompt "Backup Register Number"
706 depends on RTC_DRV_AT91SAM9
708 The RTC driver needs to use one of the General Purpose Backup
709 Registers (GPBRs) as well as the RTT. You can choose which one
710 will be used. The default of zero is normally OK to use, but
711 on some systems other software needs to use that register.
713 config RTC_DRV_AU1XXX
714 tristate "Au1xxx Counter0 RTC support"
715 depends on SOC_AU1X00
717 This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
718 counter) to be used as a RTC.
720 This driver can also be built as a module. If so, the module
721 will be called rtc-au1xxx.
724 tristate "Blackfin On-Chip RTC"
725 depends on BLACKFIN && !BF561
727 If you say yes here you will get support for the
728 Blackfin On-Chip Real Time Clock.
730 This driver can also be built as a module. If so, the module
731 will be called rtc-bfin.
733 config RTC_DRV_RS5C313
734 tristate "Ricoh RS5C313"
735 depends on SH_LANDISK
737 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
739 config RTC_DRV_GENERIC
740 tristate "Generic RTC support"
741 # Please consider writing a new RTC driver instead of using the generic
743 depends on PARISC || M68K || PPC || SUPERH32
745 Say Y or M here to enable RTC support on systems using the generic
746 RTC abstraction. If you do not know what you are doing, you should
750 tristate "PXA27x/PXA3xx"
753 If you say Y here you will get access to the real time clock
754 built into your PXA27x or PXA3xx CPU.
756 This RTC driver uses PXA RTC registers available since pxa27x
757 series (RDxR, RYxR) instead of legacy RCNR, RTAR.
761 bool "SUN4V Hypervisor RTC"
764 If you say Y here you will get support for the Hypervisor
765 based RTC on SUN4V systems.
767 config RTC_DRV_STARFIRE
771 If you say Y here you will get support for the RTC found on
774 config RTC_DRV_TX4939
775 tristate "TX4939 SoC"
776 depends on SOC_TX4939
778 Driver for the internal RTC (Realtime Clock) module found on
782 tristate "Marvell SoC RTC"
783 depends on ARCH_KIRKWOOD
785 If you say yes here you will get support for the in-chip RTC
786 that can be found in some of Marvell's SoC devices, such as
787 the Kirkwood 88F6281 and 88F6192.
789 This driver can also be built as a module. If so, the module
790 will be called rtc-mv.
796 If you say yes here you will get support for the RTC on PS3.
798 This driver can also be built as a module. If so, the module
799 will be called rtc-ps3.
801 config RTC_DRV_COH901331
802 tristate "ST-Ericsson COH 901 331 RTC"
805 If you say Y here you will get access to ST-Ericsson
806 COH 901 331 RTC clock found in some ST-Ericsson Mobile
809 This driver can also be built as a module. If so, the module
810 will be called "rtc-coh901331".
814 tristate "Freescale STMP3xxx RTC"
815 depends on ARCH_STMP3XXX
817 If you say yes here you will get support for the onboard
820 This driver can also be built as a module. If so, the module
821 will be called rtc-stmp3xxx.
827 If you say Y here you will get support for the RTC found on
828 the PCAP2 ASIC used on some Motorola phones.