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".
512 config RTC_DRV_MSM6242
513 tristate "Oki MSM6242"
515 If you say yes here you get support for the Oki MSM6242
516 timekeeping chip. It is used in some Amiga models (e.g. A2000).
518 This driver can also be built as a module. If so, the module
519 will be called rtc-msm6242.
522 tristate "Freescale MXC Real Time Clock"
526 If you say yes here you get support for the Freescale MXC
529 This driver can also be built as a module, if so, the module
530 will be called "rtc-mxc".
532 config RTC_DRV_BQ4802
535 If you say Y here you will get support for the TI
538 This driver can also be built as a module. If so, the module
539 will be called rtc-bq4802.
541 config RTC_DRV_RP5C01
542 tristate "Ricoh RP5C01"
544 If you say yes here you get support for the Ricoh RP5C01
545 timekeeping chip. It is used in some Amiga models (e.g. A3000
548 This driver can also be built as a module. If so, the module
549 will be called rtc-rp5c01.
552 tristate "EM Microelectronic V3020"
554 If you say yes here you will get support for the
555 EM Microelectronic v3020 RTC chip.
557 This driver can also be built as a module. If so, the module
558 will be called rtc-v3020.
560 config RTC_DRV_WM831X
561 tristate "Wolfson Microelectronics WM831x RTC"
562 depends on MFD_WM831X
564 If you say yes here you will get support for the RTC subsystem
565 of the Wolfson Microelectronics WM831X series PMICs.
567 This driver can also be built as a module. If so, the module
568 will be called "rtc-wm831x".
570 config RTC_DRV_WM8350
571 tristate "Wolfson Microelectronics WM8350 RTC"
572 depends on MFD_WM8350
574 If you say yes here you will get support for the RTC subsystem
575 of the Wolfson Microelectronics WM8350.
577 This driver can also be built as a module. If so, the module
578 will be called "rtc-wm8350".
580 config RTC_DRV_PCF50633
581 depends on MFD_PCF50633
582 tristate "NXP PCF50633 RTC"
584 If you say yes here you get support for the RTC subsystem of the
585 NXP PCF50633 used in embedded systems.
587 config RTC_DRV_AB3100
588 tristate "ST-Ericsson AB3100 RTC"
589 depends on AB3100_CORE
590 default y if AB3100_CORE
592 Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC
593 support. This chip contains a battery- and capacitor-backed RTC.
596 comment "on-CPU RTC drivers"
600 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
602 Say "yes" here to support the real time clock on TI OMAP1 chips.
603 This driver can also be built as a module called rtc-omap.
606 tristate "Samsung S3C series SoC RTC"
607 depends on ARCH_S3C2410
609 RTC (Realtime Clock) driver for the clock inbuilt into the
610 Samsung S3C24XX series of SoCs. This can provide periodic
611 interrupt rates from 1Hz to 64Hz for user programs, and
614 The driver currently supports the common features on all the
615 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
618 This driver can also be build as a module. If so, the module
619 will be called rtc-s3c.
621 config RTC_DRV_EP93XX
622 tristate "Cirrus Logic EP93XX"
623 depends on ARCH_EP93XX
625 If you say yes here you get support for the
626 RTC embedded in the Cirrus Logic EP93XX processors.
628 This driver can also be built as a module. If so, the module
629 will be called rtc-ep93xx.
631 config RTC_DRV_SA1100
632 tristate "SA11x0/PXA2xx"
633 depends on ARCH_SA1100 || ARCH_PXA
635 If you say Y here you will get access to the real time clock
636 built into your SA11x0 or PXA2xx CPU.
638 To compile this driver as a module, choose M here: the
639 module will be called rtc-sa1100.
642 tristate "SuperH On-Chip RTC"
643 depends on RTC_CLASS && SUPERH && HAVE_CLK
645 Say Y here to enable support for the on-chip RTC found in
646 most SuperH processors.
648 To compile this driver as a module, choose M here: the
649 module will be called rtc-sh.
651 config RTC_DRV_VR41XX
652 tristate "NEC VR41XX"
653 depends on CPU_VR41XX
655 If you say Y here you will get access to the real time clock
656 built into your NEC VR41XX CPU.
658 To compile this driver as a module, choose M here: the
659 module will be called rtc-vr41xx.
662 tristate "ARM AMBA PL030 RTC"
665 If you say Y here you will get access to ARM AMBA
666 PrimeCell PL030 RTC found on certain ARM SOCs.
668 To compile this driver as a module, choose M here: the
669 module will be called rtc-pl030.
672 tristate "ARM AMBA PL031 RTC"
675 If you say Y here you will get access to ARM AMBA
676 PrimeCell PL031 RTC found on certain ARM SOCs.
678 To compile this driver as a module, choose M here: the
679 module will be called rtc-pl031.
681 config RTC_DRV_AT32AP700X
682 tristate "AT32AP700X series RTC"
683 depends on PLATFORM_AT32AP
685 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
686 AT32AP700x family processors.
688 config RTC_DRV_AT91RM9200
689 tristate "AT91RM9200 or AT91SAM9RL"
690 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
692 Driver for the internal RTC (Realtime Clock) module found on
693 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
694 this is powered by the backup power supply.
696 config RTC_DRV_AT91SAM9
697 tristate "AT91SAM9x/AT91CAP9"
698 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
700 RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
701 (Real Time Timer). These timers are powered by the backup power
702 supply (such as a small coin cell battery), but do not need to
705 (On AT91SAM9rl chips you probably want to use the dedicated RTC
706 module and leave the RTT available for other uses.)
708 config RTC_DRV_AT91SAM9_RTT
712 prompt "RTT module Number" if ARCH_AT91SAM9263
713 depends on RTC_DRV_AT91SAM9
715 More than one RTT module is available. You can choose which
716 one will be used as an RTC. The default of zero is normally
717 OK to use, though some systems use that for non-RTC purposes.
719 config RTC_DRV_AT91SAM9_GPBR
721 range 0 3 if !ARCH_AT91SAM9263
722 range 0 15 if ARCH_AT91SAM9263
724 prompt "Backup Register Number"
725 depends on RTC_DRV_AT91SAM9
727 The RTC driver needs to use one of the General Purpose Backup
728 Registers (GPBRs) as well as the RTT. You can choose which one
729 will be used. The default of zero is normally OK to use, but
730 on some systems other software needs to use that register.
732 config RTC_DRV_AU1XXX
733 tristate "Au1xxx Counter0 RTC support"
734 depends on SOC_AU1X00
736 This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
737 counter) to be used as a RTC.
739 This driver can also be built as a module. If so, the module
740 will be called rtc-au1xxx.
743 tristate "Blackfin On-Chip RTC"
744 depends on BLACKFIN && !BF561
746 If you say yes here you will get support for the
747 Blackfin On-Chip Real Time Clock.
749 This driver can also be built as a module. If so, the module
750 will be called rtc-bfin.
752 config RTC_DRV_RS5C313
753 tristate "Ricoh RS5C313"
754 depends on SH_LANDISK
756 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
758 config RTC_DRV_GENERIC
759 tristate "Generic RTC support"
760 # Please consider writing a new RTC driver instead of using the generic
762 depends on PARISC || M68K || PPC || SUPERH32
764 Say Y or M here to enable RTC support on systems using the generic
765 RTC abstraction. If you do not know what you are doing, you should
769 tristate "PXA27x/PXA3xx"
772 If you say Y here you will get access to the real time clock
773 built into your PXA27x or PXA3xx CPU.
775 This RTC driver uses PXA RTC registers available since pxa27x
776 series (RDxR, RYxR) instead of legacy RCNR, RTAR.
780 bool "SUN4V Hypervisor RTC"
783 If you say Y here you will get support for the Hypervisor
784 based RTC on SUN4V systems.
786 config RTC_DRV_STARFIRE
790 If you say Y here you will get support for the RTC found on
793 config RTC_DRV_TX4939
794 tristate "TX4939 SoC"
795 depends on SOC_TX4939
797 Driver for the internal RTC (Realtime Clock) module found on
801 tristate "Marvell SoC RTC"
802 depends on ARCH_KIRKWOOD || ARCH_DOVE
804 If you say yes here you will get support for the in-chip RTC
805 that can be found in some of Marvell's SoC devices, such as
806 the Kirkwood 88F6281 and 88F6192.
808 This driver can also be built as a module. If so, the module
809 will be called rtc-mv.
815 If you say yes here you will get support for the RTC on PS3.
817 This driver can also be built as a module. If so, the module
818 will be called rtc-ps3.
820 config RTC_DRV_COH901331
821 tristate "ST-Ericsson COH 901 331 RTC"
824 If you say Y here you will get access to ST-Ericsson
825 COH 901 331 RTC clock found in some ST-Ericsson Mobile
828 This driver can also be built as a module. If so, the module
829 will be called "rtc-coh901331".
833 tristate "Freescale STMP3xxx RTC"
834 depends on ARCH_STMP3XXX
836 If you say yes here you will get support for the onboard
839 This driver can also be built as a module. If so, the module
840 will be called rtc-stmp3xxx.
846 If you say Y here you will get support for the RTC found on
847 the PCAP2 ASIC used on some Motorola phones.