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_DM355EVM
245 tristate "TI DaVinci DM355 EVM RTC"
246 depends on MFD_DM355EVM_MSP
248 Supports the RTC firmware in the MSP430 on the DM355 EVM.
250 config RTC_DRV_TWL92330
251 boolean "TI TWL92330/Menelaus"
254 If you say yes here you get support for the RTC on the
255 TWL92330 "Menelaus" power management chip, used with OMAP2
256 platforms. The support is integrated with the rest of
257 the Menelaus driver; it's not separate module.
259 config RTC_DRV_TWL4030
260 tristate "TI TWL4030/TWL5030/TPS659x0"
261 depends on RTC_CLASS && TWL4030_CORE
263 If you say yes here you get support for the RTC on the
264 TWL4030 family chips, used mostly with OMAP3 platforms.
266 This driver can also be built as a module. If so, the module
267 will be called rtc-twl4030.
269 config RTC_DRV_S35390A
270 tristate "Seiko Instruments S-35390A"
273 If you say yes here you will get support for the Seiko
274 Instruments S-35390A.
276 This driver can also be built as a module. If so the module
277 will be called rtc-s35390a.
279 config RTC_DRV_FM3130
280 tristate "Ramtron FM3130"
282 If you say Y here you will get support for the
283 Ramtron FM3130 RTC chips.
284 Ramtron FM3130 is a chip with two separate devices inside,
285 RTC clock and FRAM. This driver provides only RTC functionality.
287 This driver can also be built as a module. If so the module
288 will be called rtc-fm3130.
290 config RTC_DRV_RX8581
291 tristate "Epson RX-8581"
293 If you say yes here you will get support for the Epson RX-8581.
295 This driver can also be built as a module. If so the module
296 will be called rtc-rx8581.
300 comment "SPI RTC drivers"
304 config RTC_DRV_M41T94
307 If you say yes here you will get support for the
308 ST M41T94 SPI RTC chip.
310 This driver can also be built as a module. If so, the module
311 will be called rtc-m41t94.
313 config RTC_DRV_DS1305
314 tristate "Dallas/Maxim DS1305/DS1306"
316 Select this driver to get support for the Dallas/Maxim DS1305
317 and DS1306 real time clock chips. These support a trickle
318 charger, alarms, and NVRAM in addition to the clock.
320 This driver can also be built as a module. If so, the module
321 will be called rtc-ds1305.
323 config RTC_DRV_DS1390
324 tristate "Dallas/Maxim DS1390/93/94"
326 If you say yes here you get support for the
327 Dallas/Maxim DS1390/93/94 chips.
329 This driver only supports the RTC feature, and not other chip
330 features such as alarms and trickle charging.
332 This driver can also be built as a module. If so, the module
333 will be called rtc-ds1390.
335 config RTC_DRV_MAX6902
336 tristate "Maxim MAX6902"
338 If you say yes here you will get support for the
339 Maxim MAX6902 SPI RTC chip.
341 This driver can also be built as a module. If so, the module
342 will be called rtc-max6902.
345 tristate "Epson RTC-9701JE"
347 If you say yes here you will get support for the
348 Epson RTC-9701JE SPI RTC chip.
350 This driver can also be built as a module. If so, the module
351 will be called rtc-r9701.
353 config RTC_DRV_RS5C348
354 tristate "Ricoh RS5C348A/B"
356 If you say yes here you get support for the
357 Ricoh RS5C348A and RS5C348B RTC chips.
359 This driver can also be built as a module. If so, the module
360 will be called rtc-rs5c348.
362 config RTC_DRV_DS3234
363 tristate "Maxim/Dallas DS3234"
365 If you say yes here you get support for the
366 Maxim/Dallas DS3234 SPI RTC chip.
368 This driver can also be built as a module. If so, the module
369 will be called rtc-ds3234.
373 comment "Platform RTC drivers"
375 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
376 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
377 # global rtc_lock ... it's not yet just another platform_device.
380 tristate "PC-style 'CMOS'"
381 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC64
384 Say "yes" here to get direct support for the real time clock
385 found in every PC or ACPI-based system, and some other boards.
386 Specifically the original MC146818, compatibles like those in
387 PC south bridges, the DS12887 or M48T86, some multifunction
388 or LPC bus chips, and so on.
390 Your system will need to define the platform device used by
391 this driver, otherwise it won't be accessible. This means
392 you can safely enable this driver if you don't know whether
393 or not your board has this kind of hardware.
395 This driver can also be built as a module. If so, the module
396 will be called rtc-cmos.
398 config RTC_DRV_DS1216
399 tristate "Dallas DS1216"
402 If you say yes here you get support for the Dallas DS1216 RTC chips.
404 config RTC_DRV_DS1286
405 tristate "Dallas DS1286"
407 If you say yes here you get support for the Dallas DS1286 RTC chips.
409 config RTC_DRV_DS1302
410 tristate "Dallas DS1302"
411 depends on SH_SECUREEDGE5410
413 If you say yes here you get support for the Dallas DS1302 RTC chips.
415 config RTC_DRV_DS1511
416 tristate "Dallas DS1511"
419 If you say yes here you get support for the
420 Dallas DS1511 timekeeping/watchdog chip.
422 This driver can also be built as a module. If so, the module
423 will be called rtc-ds1511.
425 config RTC_DRV_DS1553
426 tristate "Maxim/Dallas DS1553"
428 If you say yes here you get support for the
429 Maxim/Dallas DS1553 timekeeping chip.
431 This driver can also be built as a module. If so, the module
432 will be called rtc-ds1553.
434 config RTC_DRV_DS1742
435 tristate "Maxim/Dallas DS1742/1743"
437 If you say yes here you get support for the
438 Maxim/Dallas DS1742/1743 timekeeping chip.
440 This driver can also be built as a module. If so, the module
441 will be called rtc-ds1742.
447 If you say yes here you will get support for the EFI
450 This driver can also be built as a module. If so, the module
451 will be called rtc-efi.
453 config RTC_DRV_STK17TA8
454 tristate "Simtek STK17TA8"
457 If you say yes here you get support for the
458 Simtek STK17TA8 timekeeping chip.
460 This driver can also be built as a module. If so, the module
461 will be called rtc-stk17ta8.
463 config RTC_DRV_M48T86
464 tristate "ST M48T86/Dallas DS12887"
466 If you say Y here you will get support for the
467 ST M48T86 and Dallas DS12887 RTC chips.
469 This driver can also be built as a module. If so, the module
470 will be called rtc-m48t86.
472 config RTC_DRV_M48T35
475 If you say Y here you will get support for the
478 This driver can also be built as a module, if so, the module
479 will be called "rtc-m48t35".
481 config RTC_DRV_M48T59
482 tristate "ST M48T59/M48T08/M48T02"
484 If you say Y here you will get support for the
485 ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
487 These chips are usually found in Sun SPARC and UltraSPARC
490 This driver can also be built as a module, if so, the module
491 will be called "rtc-m48t59".
493 config RTC_DRV_BQ4802
496 If you say Y here you will get support for the TI
499 This driver can also be built as a module. If so, the module
500 will be called rtc-bq4802.
503 tristate "EM Microelectronic V3020"
505 If you say yes here you will get support for the
506 EM Microelectronic v3020 RTC chip.
508 This driver can also be built as a module. If so, the module
509 will be called rtc-v3020.
511 config RTC_DRV_WM8350
512 tristate "Wolfson Microelectronics WM8350 RTC"
513 depends on MFD_WM8350
515 If you say yes here you will get support for the RTC subsystem
516 of the Wolfson Microelectronics WM8350.
518 This driver can also be built as a module. If so, the module
519 will be called "rtc-wm8350".
521 config RTC_DRV_PCF50633
522 depends on MFD_PCF50633
523 tristate "NXP PCF50633 RTC"
525 If you say yes here you get support for the RTC subsystem of the
526 NXP PCF50633 used in embedded systems.
528 comment "on-CPU RTC drivers"
532 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
534 Say "yes" here to support the real time clock on TI OMAP1 chips.
535 This driver can also be built as a module called rtc-omap.
538 tristate "Samsung S3C series SoC RTC"
539 depends on ARCH_S3C2410
541 RTC (Realtime Clock) driver for the clock inbuilt into the
542 Samsung S3C24XX series of SoCs. This can provide periodic
543 interrupt rates from 1Hz to 64Hz for user programs, and
546 The driver currently supports the common features on all the
547 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
550 This driver can also be build as a module. If so, the module
551 will be called rtc-s3c.
553 config RTC_DRV_EP93XX
554 tristate "Cirrus Logic EP93XX"
555 depends on ARCH_EP93XX
557 If you say yes here you get support for the
558 RTC embedded in the Cirrus Logic EP93XX processors.
560 This driver can also be built as a module. If so, the module
561 will be called rtc-ep93xx.
563 config RTC_DRV_SA1100
564 tristate "SA11x0/PXA2xx"
565 depends on ARCH_SA1100 || ARCH_PXA
567 If you say Y here you will get access to the real time clock
568 built into your SA11x0 or PXA2xx CPU.
570 To compile this driver as a module, choose M here: the
571 module will be called rtc-sa1100.
574 tristate "SuperH On-Chip RTC"
575 depends on RTC_CLASS && SUPERH
577 Say Y here to enable support for the on-chip RTC found in
578 most SuperH processors.
580 To compile this driver as a module, choose M here: the
581 module will be called rtc-sh.
583 config RTC_DRV_VR41XX
584 tristate "NEC VR41XX"
585 depends on CPU_VR41XX
587 If you say Y here you will get access to the real time clock
588 built into your NEC VR41XX CPU.
590 To compile this driver as a module, choose M here: the
591 module will be called rtc-vr41xx.
594 tristate "ARM AMBA PL030 RTC"
597 If you say Y here you will get access to ARM AMBA
598 PrimeCell PL030 RTC found on certain ARM SOCs.
600 To compile this driver as a module, choose M here: the
601 module will be called rtc-pl030.
604 tristate "ARM AMBA PL031 RTC"
607 If you say Y here you will get access to ARM AMBA
608 PrimeCell PL031 RTC found on certain ARM SOCs.
610 To compile this driver as a module, choose M here: the
611 module will be called rtc-pl031.
613 config RTC_DRV_AT32AP700X
614 tristate "AT32AP700X series RTC"
615 depends on PLATFORM_AT32AP
617 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
618 AT32AP700x family processors.
620 config RTC_DRV_AT91RM9200
621 tristate "AT91RM9200 or AT91SAM9RL"
622 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
624 Driver for the internal RTC (Realtime Clock) module found on
625 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
626 this is powered by the backup power supply.
628 config RTC_DRV_AT91SAM9
629 tristate "AT91SAM9x/AT91CAP9"
630 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
632 RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
633 (Real Time Timer). These timers are powered by the backup power
634 supply (such as a small coin cell battery), but do not need to
637 (On AT91SAM9rl chips you probably want to use the dedicated RTC
638 module and leave the RTT available for other uses.)
640 config RTC_DRV_AT91SAM9_RTT
644 prompt "RTT module Number" if ARCH_AT91SAM9263
645 depends on RTC_DRV_AT91SAM9
647 More than one RTT module is available. You can choose which
648 one will be used as an RTC. The default of zero is normally
649 OK to use, though some systems use that for non-RTC purposes.
651 config RTC_DRV_AT91SAM9_GPBR
653 range 0 3 if !ARCH_AT91SAM9263
654 range 0 15 if ARCH_AT91SAM9263
656 prompt "Backup Register Number"
657 depends on RTC_DRV_AT91SAM9
659 The RTC driver needs to use one of the General Purpose Backup
660 Registers (GPBRs) as well as the RTT. You can choose which one
661 will be used. The default of zero is normally OK to use, but
662 on some systems other software needs to use that register.
664 config RTC_DRV_AU1XXX
665 tristate "Au1xxx Counter0 RTC support"
666 depends on SOC_AU1X00
668 This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
669 counter) to be used as a RTC.
671 This driver can also be built as a module. If so, the module
672 will be called rtc-au1xxx.
675 tristate "Blackfin On-Chip RTC"
676 depends on BLACKFIN && !BF561
678 If you say yes here you will get support for the
679 Blackfin On-Chip Real Time Clock.
681 This driver can also be built as a module. If so, the module
682 will be called rtc-bfin.
684 config RTC_DRV_RS5C313
685 tristate "Ricoh RS5C313"
686 depends on SH_LANDISK
688 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
690 config RTC_DRV_PARISC
691 tristate "PA-RISC firmware RTC support"
694 Say Y or M here to enable RTC support on PA-RISC systems using
695 firmware calls. If you do not know what you are doing, you should
699 tristate "PowerPC machine dependent RTC support"
702 The PowerPC kernel has machine-specific functions for accessing
703 the RTC. This exposes that functionality through the generic RTC
707 tristate "PXA27x/PXA3xx"
710 If you say Y here you will get access to the real time clock
711 built into your PXA27x or PXA3xx CPU.
713 This RTC driver uses PXA RTC registers available since pxa27x
714 series (RDxR, RYxR) instead of legacy RCNR, RTAR.
718 bool "SUN4V Hypervisor RTC"
721 If you say Y here you will get support for the Hypervisor
722 based RTC on SUN4V systems.
724 config RTC_DRV_STARFIRE
728 If you say Y here you will get support for the RTC found on
731 config RTC_DRV_TX4939
732 tristate "TX4939 SoC"
733 depends on SOC_TX4939
735 Driver for the internal RTC (Realtime Clock) module found on
739 tristate "Marvell SoC RTC"
740 depends on ARCH_KIRKWOOD
742 If you say yes here you will get support for the in-chip RTC
743 that can be found in some of Marvell's SoC devices, such as
744 the Kirkwood 88F6281 and 88F6192.
746 This driver can also be built as a module. If so, the module
747 will be called rtc-mv.