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.
383 comment "Platform RTC drivers"
385 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
386 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
387 # global rtc_lock ... it's not yet just another platform_device.
390 tristate "PC-style 'CMOS'"
391 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC64
394 Say "yes" here to get direct support for the real time clock
395 found in every PC or ACPI-based system, and some other boards.
396 Specifically the original MC146818, compatibles like those in
397 PC south bridges, the DS12887 or M48T86, some multifunction
398 or LPC bus chips, and so on.
400 Your system will need to define the platform device used by
401 this driver, otherwise it won't be accessible. This means
402 you can safely enable this driver if you don't know whether
403 or not your board has this kind of hardware.
405 This driver can also be built as a module. If so, the module
406 will be called rtc-cmos.
408 config RTC_DRV_DS1216
409 tristate "Dallas DS1216"
412 If you say yes here you get support for the Dallas DS1216 RTC chips.
414 config RTC_DRV_DS1286
415 tristate "Dallas DS1286"
417 If you say yes here you get support for the Dallas DS1286 RTC chips.
419 config RTC_DRV_DS1302
420 tristate "Dallas DS1302"
421 depends on SH_SECUREEDGE5410
423 If you say yes here you get support for the Dallas DS1302 RTC chips.
425 config RTC_DRV_DS1511
426 tristate "Dallas DS1511"
429 If you say yes here you get support for the
430 Dallas DS1511 timekeeping/watchdog chip.
432 This driver can also be built as a module. If so, the module
433 will be called rtc-ds1511.
435 config RTC_DRV_DS1553
436 tristate "Maxim/Dallas DS1553"
438 If you say yes here you get support for the
439 Maxim/Dallas DS1553 timekeeping chip.
441 This driver can also be built as a module. If so, the module
442 will be called rtc-ds1553.
444 config RTC_DRV_DS1742
445 tristate "Maxim/Dallas DS1742/1743"
447 If you say yes here you get support for the
448 Maxim/Dallas DS1742/1743 timekeeping chip.
450 This driver can also be built as a module. If so, the module
451 will be called rtc-ds1742.
457 If you say yes here you will get support for the EFI
460 This driver can also be built as a module. If so, the module
461 will be called rtc-efi.
463 config RTC_DRV_STK17TA8
464 tristate "Simtek STK17TA8"
467 If you say yes here you get support for the
468 Simtek STK17TA8 timekeeping chip.
470 This driver can also be built as a module. If so, the module
471 will be called rtc-stk17ta8.
473 config RTC_DRV_M48T86
474 tristate "ST M48T86/Dallas DS12887"
476 If you say Y here you will get support for the
477 ST M48T86 and Dallas DS12887 RTC chips.
479 This driver can also be built as a module. If so, the module
480 will be called rtc-m48t86.
482 config RTC_DRV_M48T35
485 If you say Y here you will get support for the
488 This driver can also be built as a module, if so, the module
489 will be called "rtc-m48t35".
491 config RTC_DRV_M48T59
492 tristate "ST M48T59/M48T08/M48T02"
494 If you say Y here you will get support for the
495 ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
497 These chips are usually found in Sun SPARC and UltraSPARC
500 This driver can also be built as a module, if so, the module
501 will be called "rtc-m48t59".
503 config RTC_DRV_BQ4802
506 If you say Y here you will get support for the TI
509 This driver can also be built as a module. If so, the module
510 will be called rtc-bq4802.
513 tristate "EM Microelectronic V3020"
515 If you say yes here you will get support for the
516 EM Microelectronic v3020 RTC chip.
518 This driver can also be built as a module. If so, the module
519 will be called rtc-v3020.
521 config RTC_DRV_WM8350
522 tristate "Wolfson Microelectronics WM8350 RTC"
523 depends on MFD_WM8350
525 If you say yes here you will get support for the RTC subsystem
526 of the Wolfson Microelectronics WM8350.
528 This driver can also be built as a module. If so, the module
529 will be called "rtc-wm8350".
531 config RTC_DRV_PCF50633
532 depends on MFD_PCF50633
533 tristate "NXP PCF50633 RTC"
535 If you say yes here you get support for the RTC subsystem of the
536 NXP PCF50633 used in embedded systems.
538 comment "on-CPU RTC drivers"
542 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
544 Say "yes" here to support the real time clock on TI OMAP1 chips.
545 This driver can also be built as a module called rtc-omap.
548 tristate "Samsung S3C series SoC RTC"
549 depends on ARCH_S3C2410
551 RTC (Realtime Clock) driver for the clock inbuilt into the
552 Samsung S3C24XX series of SoCs. This can provide periodic
553 interrupt rates from 1Hz to 64Hz for user programs, and
556 The driver currently supports the common features on all the
557 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
560 This driver can also be build as a module. If so, the module
561 will be called rtc-s3c.
563 config RTC_DRV_EP93XX
564 tristate "Cirrus Logic EP93XX"
565 depends on ARCH_EP93XX
567 If you say yes here you get support for the
568 RTC embedded in the Cirrus Logic EP93XX processors.
570 This driver can also be built as a module. If so, the module
571 will be called rtc-ep93xx.
573 config RTC_DRV_SA1100
574 tristate "SA11x0/PXA2xx"
575 depends on ARCH_SA1100 || ARCH_PXA
577 If you say Y here you will get access to the real time clock
578 built into your SA11x0 or PXA2xx CPU.
580 To compile this driver as a module, choose M here: the
581 module will be called rtc-sa1100.
584 tristate "SuperH On-Chip RTC"
585 depends on RTC_CLASS && SUPERH && HAVE_CLK
587 Say Y here to enable support for the on-chip RTC found in
588 most SuperH processors.
590 To compile this driver as a module, choose M here: the
591 module will be called rtc-sh.
593 config RTC_DRV_VR41XX
594 tristate "NEC VR41XX"
595 depends on CPU_VR41XX
597 If you say Y here you will get access to the real time clock
598 built into your NEC VR41XX CPU.
600 To compile this driver as a module, choose M here: the
601 module will be called rtc-vr41xx.
604 tristate "ARM AMBA PL030 RTC"
607 If you say Y here you will get access to ARM AMBA
608 PrimeCell PL030 RTC found on certain ARM SOCs.
610 To compile this driver as a module, choose M here: the
611 module will be called rtc-pl030.
614 tristate "ARM AMBA PL031 RTC"
617 If you say Y here you will get access to ARM AMBA
618 PrimeCell PL031 RTC found on certain ARM SOCs.
620 To compile this driver as a module, choose M here: the
621 module will be called rtc-pl031.
623 config RTC_DRV_AT32AP700X
624 tristate "AT32AP700X series RTC"
625 depends on PLATFORM_AT32AP
627 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
628 AT32AP700x family processors.
630 config RTC_DRV_AT91RM9200
631 tristate "AT91RM9200 or AT91SAM9RL"
632 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
634 Driver for the internal RTC (Realtime Clock) module found on
635 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
636 this is powered by the backup power supply.
638 config RTC_DRV_AT91SAM9
639 tristate "AT91SAM9x/AT91CAP9"
640 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
642 RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
643 (Real Time Timer). These timers are powered by the backup power
644 supply (such as a small coin cell battery), but do not need to
647 (On AT91SAM9rl chips you probably want to use the dedicated RTC
648 module and leave the RTT available for other uses.)
650 config RTC_DRV_AT91SAM9_RTT
654 prompt "RTT module Number" if ARCH_AT91SAM9263
655 depends on RTC_DRV_AT91SAM9
657 More than one RTT module is available. You can choose which
658 one will be used as an RTC. The default of zero is normally
659 OK to use, though some systems use that for non-RTC purposes.
661 config RTC_DRV_AT91SAM9_GPBR
663 range 0 3 if !ARCH_AT91SAM9263
664 range 0 15 if ARCH_AT91SAM9263
666 prompt "Backup Register Number"
667 depends on RTC_DRV_AT91SAM9
669 The RTC driver needs to use one of the General Purpose Backup
670 Registers (GPBRs) as well as the RTT. You can choose which one
671 will be used. The default of zero is normally OK to use, but
672 on some systems other software needs to use that register.
674 config RTC_DRV_AU1XXX
675 tristate "Au1xxx Counter0 RTC support"
676 depends on SOC_AU1X00
678 This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
679 counter) to be used as a RTC.
681 This driver can also be built as a module. If so, the module
682 will be called rtc-au1xxx.
685 tristate "Blackfin On-Chip RTC"
686 depends on BLACKFIN && !BF561
688 If you say yes here you will get support for the
689 Blackfin On-Chip Real Time Clock.
691 This driver can also be built as a module. If so, the module
692 will be called rtc-bfin.
694 config RTC_DRV_RS5C313
695 tristate "Ricoh RS5C313"
696 depends on SH_LANDISK
698 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
700 config RTC_DRV_GENERIC
701 tristate "Generic RTC support"
702 # Please consider writing a new RTC driver instead of using the generic
704 depends on PARISC || M68K || PPC || SUPERH32
706 Say Y or M here to enable RTC support on systems using the generic
707 RTC abstraction. If you do not know what you are doing, you should
711 tristate "PXA27x/PXA3xx"
714 If you say Y here you will get access to the real time clock
715 built into your PXA27x or PXA3xx CPU.
717 This RTC driver uses PXA RTC registers available since pxa27x
718 series (RDxR, RYxR) instead of legacy RCNR, RTAR.
722 bool "SUN4V Hypervisor RTC"
725 If you say Y here you will get support for the Hypervisor
726 based RTC on SUN4V systems.
728 config RTC_DRV_STARFIRE
732 If you say Y here you will get support for the RTC found on
735 config RTC_DRV_TX4939
736 tristate "TX4939 SoC"
737 depends on SOC_TX4939
739 Driver for the internal RTC (Realtime Clock) module found on
743 tristate "Marvell SoC RTC"
744 depends on ARCH_KIRKWOOD
746 If you say yes here you will get support for the in-chip RTC
747 that can be found in some of Marvell's SoC devices, such as
748 the Kirkwood 88F6281 and 88F6192.
750 This driver can also be built as a module. If so, the module
751 will be called rtc-mv.
757 If you say yes here you will get support for the RTC on PS3.
759 This driver can also be built as a module. If so, the module
760 will be called rtc-ps3.