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.
72 This driver can also be built as a module. If so, the module
73 will be called rtc-sysfs.
76 boolean "/proc/driver/rtc (procfs for rtc0)"
80 Say yes here if you want to use your first RTC through the proc
81 interface, /proc/driver/rtc. Other RTCs will not be available
84 This driver can also be built as a module. If so, the module
85 will be called rtc-proc.
88 boolean "/dev/rtcN (character devices)"
91 Say yes here if you want to use your RTCs using the /dev
92 interfaces, which "udev" sets up as /dev/rtc0 through
93 /dev/rtcN. You may want to set up a symbolic link so one
94 of these can be accessed as /dev/rtc, which is a name
95 expected by "hwclock" and some other programs.
97 This driver can also be built as a module. If so, the module
98 will be called rtc-dev.
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 DS1390/93/94 chips.
322 This driver only supports the RTC feature, and not other chip
323 features such as alarms and trickle charging.
325 This driver can also be built as a module. If so, the module
326 will be called rtc-ds1390.
328 config RTC_DRV_MAX6902
329 tristate "Maxim MAX6902"
331 If you say yes here you will get support for the
332 Maxim MAX6902 SPI RTC chip.
334 This driver can also be built as a module. If so, the module
335 will be called rtc-max6902.
338 tristate "Epson RTC-9701JE"
340 If you say yes here you will get support for the
341 Epson RTC-9701JE SPI RTC chip.
343 This driver can also be built as a module. If so, the module
344 will be called rtc-r9701.
346 config RTC_DRV_RS5C348
347 tristate "Ricoh RS5C348A/B"
349 If you say yes here you get support for the
350 Ricoh RS5C348A and RS5C348B RTC chips.
352 This driver can also be built as a module. If so, the module
353 will be called rtc-rs5c348.
355 config RTC_DRV_DS3234
356 tristate "Maxim/Dallas DS3234"
358 If you say yes here you get support for the
359 Maxim/Dallas DS3234 SPI RTC chip.
361 This driver can also be built as a module. If so, the module
362 will be called rtc-ds3234.
366 comment "Platform RTC drivers"
368 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
369 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
370 # global rtc_lock ... it's not yet just another platform_device.
373 tristate "PC-style 'CMOS'"
374 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC64
377 Say "yes" here to get direct support for the real time clock
378 found in every PC or ACPI-based system, and some other boards.
379 Specifically the original MC146818, compatibles like those in
380 PC south bridges, the DS12887 or M48T86, some multifunction
381 or LPC bus chips, and so on.
383 Your system will need to define the platform device used by
384 this driver, otherwise it won't be accessible. This means
385 you can safely enable this driver if you don't know whether
386 or not your board has this kind of hardware.
388 This driver can also be built as a module. If so, the module
389 will be called rtc-cmos.
391 config RTC_DRV_DS1216
392 tristate "Dallas DS1216"
395 If you say yes here you get support for the Dallas DS1216 RTC chips.
397 config RTC_DRV_DS1286
398 tristate "Dallas DS1286"
400 If you say yes here you get support for the Dallas DS1286 RTC chips.
402 config RTC_DRV_DS1302
403 tristate "Dallas DS1302"
404 depends on SH_SECUREEDGE5410
406 If you say yes here you get support for the Dallas DS1302 RTC chips.
408 config RTC_DRV_DS1511
409 tristate "Dallas DS1511"
412 If you say yes here you get support for the
413 Dallas DS1511 timekeeping/watchdog chip.
415 This driver can also be built as a module. If so, the module
416 will be called rtc-ds1511.
418 config RTC_DRV_DS1553
419 tristate "Maxim/Dallas DS1553"
421 If you say yes here you get support for the
422 Maxim/Dallas DS1553 timekeeping chip.
424 This driver can also be built as a module. If so, the module
425 will be called rtc-ds1553.
427 config RTC_DRV_DS1742
428 tristate "Maxim/Dallas DS1742/1743"
430 If you say yes here you get support for the
431 Maxim/Dallas DS1742/1743 timekeeping chip.
433 This driver can also be built as a module. If so, the module
434 will be called rtc-ds1742.
436 config RTC_DRV_STK17TA8
437 tristate "Simtek STK17TA8"
440 If you say yes here you get support for the
441 Simtek STK17TA8 timekeeping chip.
443 This driver can also be built as a module. If so, the module
444 will be called rtc-stk17ta8.
446 config RTC_DRV_M48T86
447 tristate "ST M48T86/Dallas DS12887"
449 If you say Y here you will get support for the
450 ST M48T86 and Dallas DS12887 RTC chips.
452 This driver can also be built as a module. If so, the module
453 will be called rtc-m48t86.
455 config RTC_DRV_M48T35
458 If you say Y here you will get support for the
461 This driver can also be built as a module, if so, the module
462 will be called "rtc-m48t35".
464 config RTC_DRV_M48T59
465 tristate "ST M48T59/M48T08/M48T02"
467 If you say Y here you will get support for the
468 ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
470 These chips are usually found in Sun SPARC and UltraSPARC
473 This driver can also be built as a module, if so, the module
474 will be called "rtc-m48t59".
476 config RTC_DRV_BQ4802
479 If you say Y here you will get support for the TI
482 This driver can also be built as a module. If so, the module
483 will be called rtc-bq4802.
486 tristate "EM Microelectronic V3020"
488 If you say yes here you will get support for the
489 EM Microelectronic v3020 RTC chip.
491 This driver can also be built as a module. If so, the module
492 will be called rtc-v3020.
494 config RTC_DRV_WM8350
495 tristate "Wolfson Microelectronics WM8350 RTC"
496 depends on MFD_WM8350
498 If you say yes here you will get support for the RTC subsystem
499 of the Wolfson Microelectronics WM8350.
501 This driver can also be built as a module. If so, the module
502 will be called "rtc-wm8350".
504 comment "on-CPU RTC drivers"
508 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
510 Say "yes" here to support the real time clock on TI OMAP1 chips.
511 This driver can also be built as a module called rtc-omap.
514 tristate "Samsung S3C series SoC RTC"
515 depends on ARCH_S3C2410
517 RTC (Realtime Clock) driver for the clock inbuilt into the
518 Samsung S3C24XX series of SoCs. This can provide periodic
519 interrupt rates from 1Hz to 64Hz for user programs, and
522 The driver currently supports the common features on all the
523 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
526 This driver can also be build as a module. If so, the module
527 will be called rtc-s3c.
529 config RTC_DRV_EP93XX
530 tristate "Cirrus Logic EP93XX"
531 depends on ARCH_EP93XX
533 If you say yes here you get support for the
534 RTC embedded in the Cirrus Logic EP93XX processors.
536 This driver can also be built as a module. If so, the module
537 will be called rtc-ep93xx.
539 config RTC_DRV_SA1100
540 tristate "SA11x0/PXA2xx"
541 depends on ARCH_SA1100 || ARCH_PXA
543 If you say Y here you will get access to the real time clock
544 built into your SA11x0 or PXA2xx CPU.
546 To compile this driver as a module, choose M here: the
547 module will be called rtc-sa1100.
550 tristate "SuperH On-Chip RTC"
551 depends on RTC_CLASS && SUPERH
553 Say Y here to enable support for the on-chip RTC found in
554 most SuperH processors.
556 To compile this driver as a module, choose M here: the
557 module will be called rtc-sh.
559 config RTC_DRV_VR41XX
560 tristate "NEC VR41XX"
561 depends on CPU_VR41XX
563 If you say Y here you will get access to the real time clock
564 built into your NEC VR41XX CPU.
566 To compile this driver as a module, choose M here: the
567 module will be called rtc-vr41xx.
570 tristate "ARM AMBA PL030 RTC"
573 If you say Y here you will get access to ARM AMBA
574 PrimeCell PL030 RTC found on certain ARM SOCs.
576 To compile this driver as a module, choose M here: the
577 module will be called rtc-pl030.
580 tristate "ARM AMBA PL031 RTC"
583 If you say Y here you will get access to ARM AMBA
584 PrimeCell PL031 RTC found on certain ARM SOCs.
586 To compile this driver as a module, choose M here: the
587 module will be called rtc-pl031.
589 config RTC_DRV_AT32AP700X
590 tristate "AT32AP700X series RTC"
591 depends on PLATFORM_AT32AP
593 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
594 AT32AP700x family processors.
596 config RTC_DRV_AT91RM9200
597 tristate "AT91RM9200 or AT91SAM9RL"
598 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
600 Driver for the internal RTC (Realtime Clock) module found on
601 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
602 this is powered by the backup power supply.
604 config RTC_DRV_AT91SAM9
605 tristate "AT91SAM9x/AT91CAP9"
606 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
608 RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
609 (Real Time Timer). These timers are powered by the backup power
610 supply (such as a small coin cell battery), but do not need to
613 (On AT91SAM9rl chips you probably want to use the dedicated RTC
614 module and leave the RTT available for other uses.)
616 config RTC_DRV_AT91SAM9_RTT
620 prompt "RTT module Number" if ARCH_AT91SAM9263
621 depends on RTC_DRV_AT91SAM9
623 More than one RTT module is available. You can choose which
624 one will be used as an RTC. The default of zero is normally
625 OK to use, though some systems use that for non-RTC purposes.
627 config RTC_DRV_AT91SAM9_GPBR
629 range 0 3 if !ARCH_AT91SAM9263
630 range 0 15 if ARCH_AT91SAM9263
632 prompt "Backup Register Number"
633 depends on RTC_DRV_AT91SAM9
635 The RTC driver needs to use one of the General Purpose Backup
636 Registers (GPBRs) as well as the RTT. You can choose which one
637 will be used. The default of zero is normally OK to use, but
638 on some systems other software needs to use that register.
641 tristate "Blackfin On-Chip RTC"
642 depends on BLACKFIN && !BF561
644 If you say yes here you will get support for the
645 Blackfin On-Chip Real Time Clock.
647 This driver can also be built as a module. If so, the module
648 will be called rtc-bfin.
650 config RTC_DRV_RS5C313
651 tristate "Ricoh RS5C313"
652 depends on SH_LANDISK
654 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
656 config RTC_DRV_PARISC
657 tristate "PA-RISC firmware RTC support"
660 Say Y or M here to enable RTC support on PA-RISC systems using
661 firmware calls. If you do not know what you are doing, you should
665 tristate "PowerPC machine dependent RTC support"
668 The PowerPC kernel has machine-specific functions for accessing
669 the RTC. This exposes that functionality through the generic RTC
673 bool "SUN4V Hypervisor RTC"
676 If you say Y here you will get support for the Hypervisor
677 based RTC on SUN4V systems.
679 config RTC_DRV_STARFIRE
683 If you say Y here you will get support for the RTC found on