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"
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 and probably other chips. In some cases the RTC must already
138 have been initialized (by manufacturing or a bootloader).
140 The first seven registers on these chips hold an RTC, and other
141 registers may add features such as NVRAM, a trickle charger for
142 the RTC/NVRAM backup power, and alarms. NVRAM is visible in
143 sysfs, but other chip features may not be available.
145 This driver can also be built as a module. If so, the module
146 will be called rtc-ds1307.
148 config RTC_DRV_DS1374
149 tristate "Dallas/Maxim DS1374"
150 depends on RTC_CLASS && I2C
152 If you say yes here you get support for Dallas Semiconductor
153 DS1374 real-time clock chips. If an interrupt is associated
154 with the device, the alarm functionality is supported.
156 This driver can also be built as a module. If so, the module
157 will be called rtc-ds1374.
159 config RTC_DRV_DS1672
160 tristate "Dallas/Maxim DS1672"
162 If you say yes here you get support for the
163 Dallas/Maxim DS1672 timekeeping chip.
165 This driver can also be built as a module. If so, the module
166 will be called rtc-ds1672.
168 config RTC_DRV_MAX6900
169 tristate "Maxim MAX6900"
171 If you say yes here you will get support for the
172 Maxim MAX6900 I2C RTC chip.
174 This driver can also be built as a module. If so, the module
175 will be called rtc-max6900.
177 config RTC_DRV_RS5C372
178 tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
180 If you say yes here you get support for the
181 Ricoh R2025S/D, RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
183 This driver can also be built as a module. If so, the module
184 will be called rtc-rs5c372.
186 config RTC_DRV_ISL1208
187 tristate "Intersil ISL1208"
189 If you say yes here you get support for the
190 Intersil ISL1208 RTC chip.
192 This driver can also be built as a module. If so, the module
193 will be called rtc-isl1208.
196 tristate "Xicor/Intersil X1205"
198 If you say yes here you get support for the
199 Xicor/Intersil X1205 RTC chip.
201 This driver can also be built as a module. If so, the module
202 will be called rtc-x1205.
204 config RTC_DRV_PCF8563
205 tristate "Philips PCF8563/Epson RTC8564"
207 If you say yes here you get support for the
208 Philips PCF8563 RTC chip. The Epson RTC8564
211 This driver can also be built as a module. If so, the module
212 will be called rtc-pcf8563.
214 config RTC_DRV_PCF8583
215 tristate "Philips PCF8583"
217 If you say yes here you get support for the Philips PCF8583
218 RTC chip found on Acorn RiscPCs. This driver supports the
219 platform specific method of retrieving the current year from
220 the RTC's SRAM. It will work on other platforms with the same
221 chip, but the year will probably have to be tweaked.
223 This driver can also be built as a module. If so, the module
224 will be called rtc-pcf8583.
226 config RTC_DRV_M41T80
227 tristate "ST M41T65/M41T80/81/82/83/84/85/87"
229 If you say Y here you will get support for the ST M41T60
230 and M41T80 RTC chips series. Currently, the following chips are
231 supported: M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
232 M41ST85, and M41ST87.
234 This driver can also be built as a module. If so, the module
235 will be called rtc-m41t80.
237 config RTC_DRV_M41T80_WDT
238 bool "ST M41T65/M41T80 series RTC watchdog timer"
239 depends on RTC_DRV_M41T80
241 If you say Y here you will get support for the
242 watchdog timer in the ST M41T60 and M41T80 RTC chips series.
244 config RTC_DRV_TWL92330
245 boolean "TI TWL92330/Menelaus"
248 If you say yes here you get support for the RTC on the
249 TWL92330 "Menelaus" power management chip, used with OMAP2
250 platforms. The support is integrated with the rest of
251 the Menelaus driver; it's not separate module.
253 config RTC_DRV_TWL4030
254 tristate "TI TWL4030/TWL5030/TPS659x0"
255 depends on RTC_CLASS && TWL4030_CORE
257 If you say yes here you get support for the RTC on the
258 TWL4030 family chips, used mostly with OMAP3 platforms.
260 This driver can also be built as a module. If so, the module
261 will be called rtc-twl4030.
263 config RTC_DRV_S35390A
264 tristate "Seiko Instruments S-35390A"
267 If you say yes here you will get support for the Seiko
268 Instruments S-35390A.
270 This driver can also be built as a module. If so the module
271 will be called rtc-s35390a.
273 config RTC_DRV_FM3130
274 tristate "Ramtron FM3130"
276 If you say Y here you will get support for the
277 Ramtron FM3130 RTC chips.
278 Ramtron FM3130 is a chip with two separate devices inside,
279 RTC clock and FRAM. This driver provides only RTC functionality.
281 This driver can also be built as a module. If so the module
282 will be called rtc-fm3130.
284 config RTC_DRV_RX8581
285 tristate "Epson RX-8581"
287 If you say yes here you will get support for the Epson RX-8581.
289 This driver can also be built as a module. If so the module
290 will be called rtc-rx8581.
294 comment "SPI RTC drivers"
298 config RTC_DRV_M41T94
301 If you say yes here you will get support for the
302 ST M41T94 SPI RTC chip.
304 This driver can also be built as a module. If so, the module
305 will be called rtc-m41t94.
307 config RTC_DRV_DS1305
308 tristate "Dallas/Maxim DS1305/DS1306"
310 Select this driver to get support for the Dallas/Maxim DS1305
311 and DS1306 real time clock chips. These support a trickle
312 charger, alarms, and NVRAM in addition to the clock.
314 This driver can also be built as a module. If so, the module
315 will be called rtc-ds1305.
317 config RTC_DRV_DS1390
318 tristate "Dallas/Maxim DS1390/93/94"
320 If you say yes here you get support for the
321 Dallas/Maxim DS1390/93/94 chips.
323 This driver only supports the RTC feature, and not other chip
324 features such as alarms and trickle charging.
326 This driver can also be built as a module. If so, the module
327 will be called rtc-ds1390.
329 config RTC_DRV_MAX6902
330 tristate "Maxim MAX6902"
332 If you say yes here you will get support for the
333 Maxim MAX6902 SPI RTC chip.
335 This driver can also be built as a module. If so, the module
336 will be called rtc-max6902.
339 tristate "Epson RTC-9701JE"
341 If you say yes here you will get support for the
342 Epson RTC-9701JE SPI RTC chip.
344 This driver can also be built as a module. If so, the module
345 will be called rtc-r9701.
347 config RTC_DRV_RS5C348
348 tristate "Ricoh RS5C348A/B"
350 If you say yes here you get support for the
351 Ricoh RS5C348A and RS5C348B RTC chips.
353 This driver can also be built as a module. If so, the module
354 will be called rtc-rs5c348.
356 config RTC_DRV_DS3234
357 tristate "Maxim/Dallas DS3234"
359 If you say yes here you get support for the
360 Maxim/Dallas DS3234 SPI RTC chip.
362 This driver can also be built as a module. If so, the module
363 will be called rtc-ds3234.
367 comment "Platform RTC drivers"
369 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
370 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
371 # global rtc_lock ... it's not yet just another platform_device.
374 tristate "PC-style 'CMOS'"
375 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC64
378 Say "yes" here to get direct support for the real time clock
379 found in every PC or ACPI-based system, and some other boards.
380 Specifically the original MC146818, compatibles like those in
381 PC south bridges, the DS12887 or M48T86, some multifunction
382 or LPC bus chips, and so on.
384 Your system will need to define the platform device used by
385 this driver, otherwise it won't be accessible. This means
386 you can safely enable this driver if you don't know whether
387 or not your board has this kind of hardware.
389 This driver can also be built as a module. If so, the module
390 will be called rtc-cmos.
392 config RTC_DRV_DS1216
393 tristate "Dallas DS1216"
396 If you say yes here you get support for the Dallas DS1216 RTC chips.
398 config RTC_DRV_DS1286
399 tristate "Dallas DS1286"
401 If you say yes here you get support for the Dallas DS1286 RTC chips.
403 config RTC_DRV_DS1302
404 tristate "Dallas DS1302"
405 depends on SH_SECUREEDGE5410
407 If you say yes here you get support for the Dallas DS1302 RTC chips.
409 config RTC_DRV_DS1511
410 tristate "Dallas DS1511"
413 If you say yes here you get support for the
414 Dallas DS1511 timekeeping/watchdog chip.
416 This driver can also be built as a module. If so, the module
417 will be called rtc-ds1511.
419 config RTC_DRV_DS1553
420 tristate "Maxim/Dallas DS1553"
422 If you say yes here you get support for the
423 Maxim/Dallas DS1553 timekeeping chip.
425 This driver can also be built as a module. If so, the module
426 will be called rtc-ds1553.
428 config RTC_DRV_DS1742
429 tristate "Maxim/Dallas DS1742/1743"
431 If you say yes here you get support for the
432 Maxim/Dallas DS1742/1743 timekeeping chip.
434 This driver can also be built as a module. If so, the module
435 will be called rtc-ds1742.
437 config RTC_DRV_STK17TA8
438 tristate "Simtek STK17TA8"
441 If you say yes here you get support for the
442 Simtek STK17TA8 timekeeping chip.
444 This driver can also be built as a module. If so, the module
445 will be called rtc-stk17ta8.
447 config RTC_DRV_M48T86
448 tristate "ST M48T86/Dallas DS12887"
450 If you say Y here you will get support for the
451 ST M48T86 and Dallas DS12887 RTC chips.
453 This driver can also be built as a module. If so, the module
454 will be called rtc-m48t86.
456 config RTC_DRV_M48T35
459 If you say Y here you will get support for the
462 This driver can also be built as a module, if so, the module
463 will be called "rtc-m48t35".
465 config RTC_DRV_M48T59
466 tristate "ST M48T59/M48T08/M48T02"
468 If you say Y here you will get support for the
469 ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
471 These chips are usually found in Sun SPARC and UltraSPARC
474 This driver can also be built as a module, if so, the module
475 will be called "rtc-m48t59".
477 config RTC_DRV_BQ4802
480 If you say Y here you will get support for the TI
483 This driver can also be built as a module. If so, the module
484 will be called rtc-bq4802.
487 tristate "EM Microelectronic V3020"
489 If you say yes here you will get support for the
490 EM Microelectronic v3020 RTC chip.
492 This driver can also be built as a module. If so, the module
493 will be called rtc-v3020.
495 config RTC_DRV_WM8350
496 tristate "Wolfson Microelectronics WM8350 RTC"
497 depends on MFD_WM8350
499 If you say yes here you will get support for the RTC subsystem
500 of the Wolfson Microelectronics WM8350.
502 This driver can also be built as a module. If so, the module
503 will be called "rtc-wm8350".
505 config RTC_DRV_PCF50633
506 depends on MFD_PCF50633
507 tristate "NXP PCF50633 RTC"
509 If you say yes here you get support for the RTC subsystem of the
510 NXP PCF50633 used in embedded systems.
512 comment "on-CPU RTC drivers"
516 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
518 Say "yes" here to support the real time clock on TI OMAP1 chips.
519 This driver can also be built as a module called rtc-omap.
522 tristate "Samsung S3C series SoC RTC"
523 depends on ARCH_S3C2410
525 RTC (Realtime Clock) driver for the clock inbuilt into the
526 Samsung S3C24XX series of SoCs. This can provide periodic
527 interrupt rates from 1Hz to 64Hz for user programs, and
530 The driver currently supports the common features on all the
531 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
534 This driver can also be build as a module. If so, the module
535 will be called rtc-s3c.
537 config RTC_DRV_EP93XX
538 tristate "Cirrus Logic EP93XX"
539 depends on ARCH_EP93XX
541 If you say yes here you get support for the
542 RTC embedded in the Cirrus Logic EP93XX processors.
544 This driver can also be built as a module. If so, the module
545 will be called rtc-ep93xx.
547 config RTC_DRV_SA1100
548 tristate "SA11x0/PXA2xx"
549 depends on ARCH_SA1100 || ARCH_PXA
551 If you say Y here you will get access to the real time clock
552 built into your SA11x0 or PXA2xx CPU.
554 To compile this driver as a module, choose M here: the
555 module will be called rtc-sa1100.
558 tristate "SuperH On-Chip RTC"
559 depends on RTC_CLASS && SUPERH
561 Say Y here to enable support for the on-chip RTC found in
562 most SuperH processors.
564 To compile this driver as a module, choose M here: the
565 module will be called rtc-sh.
567 config RTC_DRV_VR41XX
568 tristate "NEC VR41XX"
569 depends on CPU_VR41XX
571 If you say Y here you will get access to the real time clock
572 built into your NEC VR41XX CPU.
574 To compile this driver as a module, choose M here: the
575 module will be called rtc-vr41xx.
578 tristate "ARM AMBA PL030 RTC"
581 If you say Y here you will get access to ARM AMBA
582 PrimeCell PL030 RTC found on certain ARM SOCs.
584 To compile this driver as a module, choose M here: the
585 module will be called rtc-pl030.
588 tristate "ARM AMBA PL031 RTC"
591 If you say Y here you will get access to ARM AMBA
592 PrimeCell PL031 RTC found on certain ARM SOCs.
594 To compile this driver as a module, choose M here: the
595 module will be called rtc-pl031.
597 config RTC_DRV_AT32AP700X
598 tristate "AT32AP700X series RTC"
599 depends on PLATFORM_AT32AP
601 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
602 AT32AP700x family processors.
604 config RTC_DRV_AT91RM9200
605 tristate "AT91RM9200 or AT91SAM9RL"
606 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
608 Driver for the internal RTC (Realtime Clock) module found on
609 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
610 this is powered by the backup power supply.
612 config RTC_DRV_AT91SAM9
613 tristate "AT91SAM9x/AT91CAP9"
614 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
616 RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
617 (Real Time Timer). These timers are powered by the backup power
618 supply (such as a small coin cell battery), but do not need to
621 (On AT91SAM9rl chips you probably want to use the dedicated RTC
622 module and leave the RTT available for other uses.)
624 config RTC_DRV_AT91SAM9_RTT
628 prompt "RTT module Number" if ARCH_AT91SAM9263
629 depends on RTC_DRV_AT91SAM9
631 More than one RTT module is available. You can choose which
632 one will be used as an RTC. The default of zero is normally
633 OK to use, though some systems use that for non-RTC purposes.
635 config RTC_DRV_AT91SAM9_GPBR
637 range 0 3 if !ARCH_AT91SAM9263
638 range 0 15 if ARCH_AT91SAM9263
640 prompt "Backup Register Number"
641 depends on RTC_DRV_AT91SAM9
643 The RTC driver needs to use one of the General Purpose Backup
644 Registers (GPBRs) as well as the RTT. You can choose which one
645 will be used. The default of zero is normally OK to use, but
646 on some systems other software needs to use that register.
648 config RTC_DRV_AU1XXX
649 tristate "Au1xxx Counter0 RTC support"
650 depends on SOC_AU1X00
652 This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
653 counter) to be used as a RTC.
655 This driver can also be built as a module. If so, the module
656 will be called rtc-au1xxx.
659 tristate "Blackfin On-Chip RTC"
660 depends on BLACKFIN && !BF561
662 If you say yes here you will get support for the
663 Blackfin On-Chip Real Time Clock.
665 This driver can also be built as a module. If so, the module
666 will be called rtc-bfin.
668 config RTC_DRV_RS5C313
669 tristate "Ricoh RS5C313"
670 depends on SH_LANDISK
672 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
674 config RTC_DRV_PARISC
675 tristate "PA-RISC firmware RTC support"
678 Say Y or M here to enable RTC support on PA-RISC systems using
679 firmware calls. If you do not know what you are doing, you should
683 tristate "PowerPC machine dependent RTC support"
686 The PowerPC kernel has machine-specific functions for accessing
687 the RTC. This exposes that functionality through the generic RTC
691 tristate "PXA27x/PXA3xx"
694 If you say Y here you will get access to the real time clock
695 built into your PXA27x or PXA3xx CPU.
697 This RTC driver uses PXA RTC registers available since pxa27x
698 series (RDxR, RYxR) instead of legacy RCNR, RTAR.
702 bool "SUN4V Hypervisor RTC"
705 If you say Y here you will get support for the Hypervisor
706 based RTC on SUN4V systems.
708 config RTC_DRV_STARFIRE
712 If you say Y here you will get support for the RTC found on
715 config RTC_DRV_TX4939
716 tristate "TX4939 SoC"
717 depends on SOC_TX4939
719 Driver for the internal RTC (Realtime Clock) module found on
723 tristate "Marvell SoC RTC"
724 depends on ARCH_KIRKWOOD
726 If you say yes here you will get support for the in-chip RTC
727 that can be found in some of Marvell's SoC devices, such as
728 the Kirkwood 88F6281 and 88F6192.
730 This driver can also be built as a module. If so, the module
731 will be called rtc-mv.