2 # RTC class/drivers configuration
11 depends on !S390 && !UML
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.
21 bool "Set system time from RTC on startup and resume"
24 If you say yes here, the system time (wall clock) will be set using
25 the value read from a specified RTC device. This is useful to avoid
26 unnecessary fsck runs at boot time, and to network better.
29 bool "Set the RTC time based on NTP synchronization"
32 If you say yes here, the system time (wall clock) will be stored
33 in the RTC specified by RTC_HCTOSYS_DEVICE approximately every 11
34 minutes if userspace reports synchronized NTP status.
36 config RTC_HCTOSYS_DEVICE
37 string "RTC used to set the system time"
38 depends on RTC_HCTOSYS = y || RTC_SYSTOHC = y
41 The RTC device that will be used to (re)initialize the system
42 clock, usually rtc0. Initialization is done when the system
43 starts up, and when it resumes from a low power state. This
44 device should record time in UTC, since the kernel won't do
47 The driver for this RTC device must be loaded before late_initcall
48 functions run, so it must usually be statically linked.
50 This clock should be battery-backed, so that it reads the correct
51 time when the system boots from a power-off state. Otherwise, your
52 system will need an external clock source (like an NTP server).
54 If the clock you specify here is not battery backed, it may still
55 be useful to reinitialize system time when resuming from system
56 sleep states. Do not specify an RTC here unless it stays powered
57 during all this system's supported sleep states.
60 bool "RTC debug support"
62 Say yes here to enable debugging support in the RTC framework
63 and individual RTC drivers.
65 comment "RTC interfaces"
68 bool "/sys/class/rtc/rtcN (sysfs)"
72 Say yes here if you want to use your RTCs using sysfs interfaces,
73 /sys/class/rtc/rtc0 through /sys/.../rtcN.
78 bool "/proc/driver/rtc (procfs for rtcN)"
82 Say yes here if you want to use your system clock RTC through
83 the proc interface, /proc/driver/rtc.
84 Other RTCs will not be available through that API.
85 If there is no RTC for the system clock, then the first RTC(rtc0)
91 bool "/dev/rtcN (character devices)"
94 Say yes here if you want to use your RTCs using the /dev
95 interfaces, which "udev" sets up as /dev/rtc0 through
98 You may want to set up a symbolic link so one of these
99 can be accessed as /dev/rtc, which is a name
100 expected by "hwclock" and some other programs. Recent
101 versions of "udev" are known to set up the symlink for you.
105 config RTC_INTF_DEV_UIE_EMUL
106 bool "RTC UIE emulation on dev interface"
107 depends on RTC_INTF_DEV
109 Provides an emulation for RTC_UIE if the underlying rtc chip
110 driver does not expose RTC_UIE ioctls. Those requests generate
111 once-per-second update interrupts, used for synchronization.
113 The emulation code will read the time from the hardware
114 clock several times per second, please enable this option
115 only if you know that you really need it.
118 tristate "Test driver/device"
120 If you say yes here you get support for the
121 RTC test driver. It's a software RTC which can be
122 used to test the RTC subsystem APIs. It gets
123 the time from the system clock.
124 You want this driver only if you are doing development
125 on the RTC subsystem. Please read the source code
128 This driver can also be built as a module. If so, the module
129 will be called rtc-test.
131 comment "I2C RTC drivers"
136 config RTC_DRV_88PM860X
137 tristate "Marvell 88PM860x"
138 depends on I2C && MFD_88PM860X
140 If you say yes here you get support for RTC function in Marvell
143 This driver can also be built as a module. If so, the module
144 will be called rtc-88pm860x.
146 config RTC_DRV_88PM80X
147 tristate "Marvell 88PM80x"
148 depends on I2C && MFD_88PM800
150 If you say yes here you get support for RTC function in Marvell
153 This driver can also be built as a module. If so, the module
154 will be called rtc-88pm80x.
156 config RTC_DRV_ABB5ZES3
159 tristate "Abracon AB-RTCMC-32.768kHz-B5ZE-S3"
161 If you say yes here you get support for the Abracon
162 AB-RTCMC-32.768kHz-B5ZE-S3 I2C RTC chip.
164 This driver can also be built as a module. If so, the module
165 will be called rtc-ab-b5ze-s3.
167 config RTC_DRV_ABX80X
168 tristate "Abracon ABx80x"
170 If you say yes here you get support for Abracon AB080X and AB180X
171 families of ultra-low-power battery- and capacitor-backed real-time
174 This driver can also be built as a module. If so, the module
175 will be called rtc-abx80x.
177 config RTC_DRV_AS3722
178 tristate "ams AS3722 RTC driver"
179 depends on MFD_AS3722
181 If you say yes here you get support for the RTC of ams AS3722 PMIC
184 This driver can also be built as a module. If so, the module
185 will be called rtc-as3722.
187 config RTC_DRV_DS1307
188 tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
190 If you say yes here you get support for various compatible RTC
191 chips (often with battery backup) connected with I2C. This driver
192 should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
193 EPSON RX-8025 and probably other chips. In some cases the RTC
194 must already have been initialized (by manufacturing or a
197 The first seven registers on these chips hold an RTC, and other
198 registers may add features such as NVRAM, a trickle charger for
199 the RTC/NVRAM backup power, and alarms. NVRAM is visible in
200 sysfs, but other chip features may not be available.
202 This driver can also be built as a module. If so, the module
203 will be called rtc-ds1307.
205 config RTC_DRV_DS1374
206 tristate "Dallas/Maxim DS1374"
209 If you say yes here you get support for Dallas Semiconductor
210 DS1374 real-time clock chips. If an interrupt is associated
211 with the device, the alarm functionality is supported.
213 This driver can also be built as a module. If so, the module
214 will be called rtc-ds1374.
216 config RTC_DRV_DS1374_WDT
217 bool "Dallas/Maxim DS1374 watchdog timer"
218 depends on RTC_DRV_DS1374
220 If you say Y here you will get support for the
221 watchdog timer in the Dallas Semiconductor DS1374
222 real-time clock chips.
224 config RTC_DRV_DS1672
225 tristate "Dallas/Maxim DS1672"
227 If you say yes here you get support for the
228 Dallas/Maxim DS1672 timekeeping chip.
230 This driver can also be built as a module. If so, the module
231 will be called rtc-ds1672.
233 config RTC_DRV_DS3232
234 tristate "Dallas/Maxim DS3232"
237 If you say yes here you get support for Dallas Semiconductor
238 DS3232 real-time clock chips. If an interrupt is associated
239 with the device, the alarm functionality is supported.
241 This driver can also be built as a module. If so, the module
242 will be called rtc-ds3232.
244 config RTC_DRV_HYM8563
245 tristate "Haoyu Microelectronics HYM8563"
248 Say Y to enable support for the HYM8563 I2C RTC chip. Apart
249 from the usual rtc functions it provides a clock output of
252 This driver can also be built as a module. If so, the module
253 will be called rtc-hym8563.
255 config RTC_DRV_LP8788
256 tristate "TI LP8788 RTC driver"
257 depends on MFD_LP8788
259 Say Y to enable support for the LP8788 RTC/ALARM driver.
261 config RTC_DRV_MAX6900
262 tristate "Maxim MAX6900"
264 If you say yes here you will get support for the
265 Maxim MAX6900 I2C RTC chip.
267 This driver can also be built as a module. If so, the module
268 will be called rtc-max6900.
270 config RTC_DRV_MAX8907
271 tristate "Maxim MAX8907"
272 depends on MFD_MAX8907
274 If you say yes here you will get support for the
275 RTC of Maxim MAX8907 PMIC.
277 This driver can also be built as a module. If so, the module
278 will be called rtc-max8907.
280 config RTC_DRV_MAX8925
281 tristate "Maxim MAX8925"
282 depends on MFD_MAX8925
284 If you say yes here you will get support for the
285 RTC of Maxim MAX8925 PMIC.
287 This driver can also be built as a module. If so, the module
288 will be called rtc-max8925.
290 config RTC_DRV_MAX8998
291 tristate "Maxim MAX8998"
292 depends on MFD_MAX8998
294 If you say yes here you will get support for the
295 RTC of Maxim MAX8998 PMIC.
297 This driver can also be built as a module. If so, the module
298 will be called rtc-max8998.
300 config RTC_DRV_MAX8997
301 tristate "Maxim MAX8997"
302 depends on MFD_MAX8997
304 If you say yes here you will get support for the
305 RTC of Maxim MAX8997 PMIC.
307 This driver can also be built as a module. If so, the module
308 will be called rtc-max8997.
310 config RTC_DRV_MAX77686
311 tristate "Maxim MAX77686"
312 depends on MFD_MAX77686
314 If you say yes here you will get support for the
315 RTC of Maxim MAX77686 PMIC.
317 This driver can also be built as a module. If so, the module
318 will be called rtc-max77686.
321 tristate "Rockchip RK808 RTC"
324 If you say yes here you will get support for the
327 This driver can also be built as a module. If so, the module
328 will be called rk808-rtc.
330 config RTC_DRV_MAX77802
331 tristate "Maxim 77802 RTC"
332 depends on MFD_MAX77686
334 If you say yes here you will get support for the
335 RTC of Maxim MAX77802 PMIC.
337 This driver can also be built as a module. If so, the module
338 will be called rtc-max77802.
340 config RTC_DRV_RS5C372
341 tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
343 If you say yes here you get support for the
344 Ricoh R2025S/D, RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
346 This driver can also be built as a module. If so, the module
347 will be called rtc-rs5c372.
349 config RTC_DRV_ISL1208
350 tristate "Intersil ISL1208"
352 If you say yes here you get support for the
353 Intersil ISL1208 RTC chip.
355 This driver can also be built as a module. If so, the module
356 will be called rtc-isl1208.
358 config RTC_DRV_ISL12022
359 tristate "Intersil ISL12022"
361 If you say yes here you get support for the
362 Intersil ISL12022 RTC chip.
364 This driver can also be built as a module. If so, the module
365 will be called rtc-isl12022.
367 config RTC_DRV_ISL12057
370 tristate "Intersil ISL12057"
372 If you say yes here you get support for the Intersil ISL12057
375 This driver can also be built as a module. If so, the module
376 will be called rtc-isl12057.
379 tristate "Xicor/Intersil X1205"
381 If you say yes here you get support for the
382 Xicor/Intersil X1205 RTC chip.
384 This driver can also be built as a module. If so, the module
385 will be called rtc-x1205.
387 config RTC_DRV_PALMAS
388 tristate "TI Palmas RTC driver"
389 depends on MFD_PALMAS
391 If you say yes here you get support for the RTC of TI PALMA series PMIC
394 This driver can also be built as a module. If so, the module
395 will be called rtc-palma.
397 config RTC_DRV_PCF2127
398 tristate "NXP PCF2127"
400 If you say yes here you get support for the NXP PCF2127/29 RTC
403 This driver can also be built as a module. If so, the module
404 will be called rtc-pcf2127.
406 config RTC_DRV_PCF8523
407 tristate "NXP PCF8523"
409 If you say yes here you get support for the NXP PCF8523 RTC
412 This driver can also be built as a module. If so, the module
413 will be called rtc-pcf8523.
415 config RTC_DRV_PCF8563
416 tristate "Philips PCF8563/Epson RTC8564"
418 If you say yes here you get support for the
419 Philips PCF8563 RTC chip. The Epson RTC8564
422 This driver can also be built as a module. If so, the module
423 will be called rtc-pcf8563.
425 config RTC_DRV_PCF85063
426 tristate "nxp PCF85063"
428 If you say yes here you get support for the PCF85063 RTC chip
430 This driver can also be built as a module. If so, the module
431 will be called rtc-pcf85063.
433 config RTC_DRV_PCF8583
434 tristate "Philips PCF8583"
436 If you say yes here you get support for the Philips PCF8583
437 RTC chip found on Acorn RiscPCs. This driver supports the
438 platform specific method of retrieving the current year from
439 the RTC's SRAM. It will work on other platforms with the same
440 chip, but the year will probably have to be tweaked.
442 This driver can also be built as a module. If so, the module
443 will be called rtc-pcf8583.
445 config RTC_DRV_M41T80
446 tristate "ST M41T62/65/M41T80/81/82/83/84/85/87 and compatible"
448 If you say Y here you will get support for the ST M41T60
449 and M41T80 RTC chips series. Currently, the following chips are
450 supported: M41T62, M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
451 M41ST85, M41ST87, and MicroCrystal RV4162.
453 This driver can also be built as a module. If so, the module
454 will be called rtc-m41t80.
456 config RTC_DRV_M41T80_WDT
457 bool "ST M41T65/M41T80 series RTC watchdog timer"
458 depends on RTC_DRV_M41T80
460 If you say Y here you will get support for the
461 watchdog timer in the ST M41T60 and M41T80 RTC chips series.
464 tristate "TI BQ32000"
466 If you say Y here you will get support for the TI
467 BQ32000 I2C RTC chip.
469 This driver can also be built as a module. If so, the module
470 will be called rtc-bq32k.
472 config RTC_DRV_DM355EVM
473 tristate "TI DaVinci DM355 EVM RTC"
474 depends on MFD_DM355EVM_MSP
476 Supports the RTC firmware in the MSP430 on the DM355 EVM.
478 config RTC_DRV_TWL92330
479 bool "TI TWL92330/Menelaus"
482 If you say yes here you get support for the RTC on the
483 TWL92330 "Menelaus" power management chip, used with OMAP2
484 platforms. The support is integrated with the rest of
485 the Menelaus driver; it's not separate module.
487 config RTC_DRV_TWL4030
488 tristate "TI TWL4030/TWL5030/TWL6030/TPS659x0"
489 depends on TWL4030_CORE
491 If you say yes here you get support for the RTC on the
492 TWL4030/TWL5030/TWL6030 family chips, used mostly with OMAP3 platforms.
494 This driver can also be built as a module. If so, the module
495 will be called rtc-twl.
497 config RTC_DRV_TPS6586X
498 tristate "TI TPS6586X RTC driver"
499 depends on MFD_TPS6586X
501 TI Power Management IC TPS6586X supports RTC functionality
502 along with alarm. This driver supports the RTC driver for
503 the TPS6586X RTC module.
505 config RTC_DRV_TPS65910
506 tristate "TI TPS65910 RTC driver"
507 depends on RTC_CLASS && MFD_TPS65910
509 If you say yes here you get support for the RTC on the
512 This driver can also be built as a module. If so, the module
513 will be called rtc-tps65910.
515 config RTC_DRV_TPS80031
516 tristate "TI TPS80031/TPS80032 RTC driver"
517 depends on MFD_TPS80031
519 TI Power Management IC TPS80031 supports RTC functionality
520 along with alarm. This driver supports the RTC driver for
521 the TPS80031 RTC module.
523 config RTC_DRV_RC5T583
524 tristate "RICOH 5T583 RTC driver"
525 depends on MFD_RC5T583
527 If you say yes here you get support for the RTC on the
530 This driver can also be built as a module. If so, the module
531 will be called rtc-rc5t583.
533 config RTC_DRV_S35390A
534 tristate "Seiko Instruments S-35390A"
537 If you say yes here you will get support for the Seiko
538 Instruments S-35390A.
540 This driver can also be built as a module. If so the module
541 will be called rtc-s35390a.
543 config RTC_DRV_FM3130
544 tristate "Ramtron FM3130"
546 If you say Y here you will get support for the
547 Ramtron FM3130 RTC chips.
548 Ramtron FM3130 is a chip with two separate devices inside,
549 RTC clock and FRAM. This driver provides only RTC functionality.
551 This driver can also be built as a module. If so the module
552 will be called rtc-fm3130.
554 config RTC_DRV_RX8581
555 tristate "Epson RX-8581"
557 If you say yes here you will get support for the Epson RX-8581.
559 This driver can also be built as a module. If so the module
560 will be called rtc-rx8581.
562 config RTC_DRV_RX8025
563 tristate "Epson RX-8025SA/NB"
565 If you say yes here you get support for the Epson
566 RX-8025SA/NB RTC chips.
568 This driver can also be built as a module. If so, the module
569 will be called rtc-rx8025.
571 config RTC_DRV_EM3027
572 tristate "EM Microelectronic EM3027"
574 If you say yes here you get support for the EM
575 Microelectronic EM3027 RTC chips.
577 This driver can also be built as a module. If so, the module
578 will be called rtc-em3027.
580 config RTC_DRV_RV3029C2
581 tristate "Micro Crystal RTC"
583 If you say yes here you get support for the Micro Crystal
586 This driver can also be built as a module. If so, the module
587 will be called rtc-rv3029c2.
590 tristate "Samsung S2M/S5M series"
591 depends on MFD_SEC_CORE
593 If you say yes here you will get support for the
594 RTC of Samsung S2MPS14 and S5M PMIC series.
596 This driver can also be built as a module. If so, the module
597 will be called rtc-s5m.
601 comment "SPI RTC drivers"
605 config RTC_DRV_M41T93
608 If you say yes here you will get support for the
609 ST M41T93 SPI RTC chip.
611 This driver can also be built as a module. If so, the module
612 will be called rtc-m41t93.
614 config RTC_DRV_M41T94
617 If you say yes here you will get support for the
618 ST M41T94 SPI RTC chip.
620 This driver can also be built as a module. If so, the module
621 will be called rtc-m41t94.
623 config RTC_DRV_DS1305
624 tristate "Dallas/Maxim DS1305/DS1306"
626 Select this driver to get support for the Dallas/Maxim DS1305
627 and DS1306 real time clock chips. These support a trickle
628 charger, alarms, and NVRAM in addition to the clock.
630 This driver can also be built as a module. If so, the module
631 will be called rtc-ds1305.
633 config RTC_DRV_DS1343
635 tristate "Dallas/Maxim DS1343/DS1344"
637 If you say yes here you get support for the
638 Dallas/Maxim DS1343 and DS1344 real time clock chips.
639 Support for trickle charger, alarm is provided.
641 This driver can also be built as a module. If so, the module
642 will be called rtc-ds1343.
644 config RTC_DRV_DS1347
645 tristate "Dallas/Maxim DS1347"
647 If you say yes here you get support for the
648 Dallas/Maxim DS1347 chips.
650 This driver only supports the RTC feature, and not other chip
651 features such as alarms.
653 This driver can also be built as a module. If so, the module
654 will be called rtc-ds1347.
656 config RTC_DRV_DS1390
657 tristate "Dallas/Maxim DS1390/93/94"
659 If you say yes here you get support for the
660 Dallas/Maxim DS1390/93/94 chips.
662 This driver only supports the RTC feature, and not other chip
663 features such as alarms and trickle charging.
665 This driver can also be built as a module. If so, the module
666 will be called rtc-ds1390.
668 config RTC_DRV_MAX6902
669 tristate "Maxim MAX6902"
671 If you say yes here you will get support for the
672 Maxim MAX6902 SPI RTC chip.
674 This driver can also be built as a module. If so, the module
675 will be called rtc-max6902.
678 tristate "Epson RTC-9701JE"
680 If you say yes here you will get support for the
681 Epson RTC-9701JE SPI RTC chip.
683 This driver can also be built as a module. If so, the module
684 will be called rtc-r9701.
686 config RTC_DRV_RS5C348
687 tristate "Ricoh RS5C348A/B"
689 If you say yes here you get support for the
690 Ricoh RS5C348A and RS5C348B RTC chips.
692 This driver can also be built as a module. If so, the module
693 will be called rtc-rs5c348.
695 config RTC_DRV_DS3234
696 tristate "Maxim/Dallas DS3234"
698 If you say yes here you get support for the
699 Maxim/Dallas DS3234 SPI RTC chip.
701 This driver can also be built as a module. If so, the module
702 will be called rtc-ds3234.
704 config RTC_DRV_PCF2123
705 tristate "NXP PCF2123"
707 If you say yes here you get support for the NXP PCF2123
710 This driver can also be built as a module. If so, the module
711 will be called rtc-pcf2123.
713 config RTC_DRV_RX4581
714 tristate "Epson RX-4581"
716 If you say yes here you will get support for the Epson RX-4581.
718 This driver can also be built as a module. If so the module
719 will be called rtc-rx4581.
721 config RTC_DRV_MCP795
722 tristate "Microchip MCP795"
724 If you say yes here you will get support for the Microchip MCP795.
726 This driver can also be built as a module. If so the module
727 will be called rtc-mcp795.
731 comment "Platform RTC drivers"
733 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
734 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
735 # global rtc_lock ... it's not yet just another platform_device.
738 tristate "PC-style 'CMOS'"
739 depends on X86 || ARM || M32R || PPC || MIPS || SPARC64
742 Say "yes" here to get direct support for the real time clock
743 found in every PC or ACPI-based system, and some other boards.
744 Specifically the original MC146818, compatibles like those in
745 PC south bridges, the DS12887 or M48T86, some multifunction
746 or LPC bus chips, and so on.
748 Your system will need to define the platform device used by
749 this driver, otherwise it won't be accessible. This means
750 you can safely enable this driver if you don't know whether
751 or not your board has this kind of hardware.
753 This driver can also be built as a module. If so, the module
754 will be called rtc-cmos.
757 bool "Alpha PC-style CMOS"
761 Direct support for the real-time clock found on every Alpha
762 system, specifically MC146818 compatibles. If in doubt, say Y.
765 tristate "Virtual RTC for Intel MID platforms"
766 depends on X86_INTEL_MID
767 default y if X86_INTEL_MID
770 Say "yes" here to get direct support for the real time clock
771 found on Moorestown platforms. The VRTC is a emulated RTC that
772 derives its clock source from a real RTC in the PMIC. The MC146818
773 style programming interface is mostly conserved, but any
774 updates are done via IPC calls to the system controller FW.
776 config RTC_DRV_DS1216
777 tristate "Dallas DS1216"
780 If you say yes here you get support for the Dallas DS1216 RTC chips.
782 config RTC_DRV_DS1286
783 tristate "Dallas DS1286"
786 If you say yes here you get support for the Dallas DS1286 RTC chips.
788 config RTC_DRV_DS1302
789 tristate "Dallas DS1302"
790 depends on SH_SECUREEDGE5410
792 If you say yes here you get support for the Dallas DS1302 RTC chips.
794 config RTC_DRV_DS1511
795 tristate "Dallas DS1511"
798 If you say yes here you get support for the
799 Dallas DS1511 timekeeping/watchdog chip.
801 This driver can also be built as a module. If so, the module
802 will be called rtc-ds1511.
804 config RTC_DRV_DS1553
805 tristate "Maxim/Dallas DS1553"
808 If you say yes here you get support for the
809 Maxim/Dallas DS1553 timekeeping chip.
811 This driver can also be built as a module. If so, the module
812 will be called rtc-ds1553.
814 config RTC_DRV_DS1685_FAMILY
815 tristate "Dallas/Maxim DS1685 Family"
817 If you say yes here you get support for the Dallas/Maxim DS1685
818 family of real time chips. This family includes the DS1685/DS1687,
819 DS1689/DS1693, DS17285/DS17287, DS17485/DS17487, and
820 DS17885/DS17887 chips.
822 This driver can also be built as a module. If so, the module
823 will be called rtc-ds1685.
827 depends on RTC_DRV_DS1685_FAMILY
828 default RTC_DRV_DS1685
830 config RTC_DRV_DS1685
833 This enables support for the Dallas/Maxim DS1685/DS1687 real time
836 This chip is commonly found in SGI O2 (IP32) and SGI Octane (IP30)
837 systems, as well as EPPC-405-UC modules by electronic system design
840 config RTC_DRV_DS1689
843 This enables support for the Dallas/Maxim DS1689/DS1693 real time
846 This is an older RTC chip, supplanted by the DS1685/DS1687 above,
847 which supports a few minor features such as Vcc, Vbat, and Power
848 Cycle counters, plus a customer-specific, 8-byte ROM/Serial number.
850 It also works for the even older DS1688/DS1691 RTC chips, which are
851 virtually the same and carry the same model number. Both chips
852 have 114 bytes of user NVRAM.
854 config RTC_DRV_DS17285
855 bool "DS17285/DS17287"
857 This enables support for the Dallas/Maxim DS17285/DS17287 real time
860 This chip features 2kb of extended NV-SRAM. It may possibly be
861 found in some SGI O2 systems (rare).
863 config RTC_DRV_DS17485
864 bool "DS17485/DS17487"
866 This enables support for the Dallas/Maxim DS17485/DS17487 real time
869 This chip features 4kb of extended NV-SRAM.
871 config RTC_DRV_DS17885
872 bool "DS17885/DS17887"
874 This enables support for the Dallas/Maxim DS17885/DS17887 real time
877 This chip features 8kb of extended NV-SRAM.
881 config RTC_DS1685_PROC_REGS
882 bool "Display register values in /proc"
883 depends on RTC_DRV_DS1685_FAMILY && PROC_FS
885 Enable this to display a readout of all of the RTC registers in
886 /proc/drivers/rtc. Keep in mind that this can potentially lead
887 to lost interrupts, as reading Control Register C will clear
888 all pending IRQ flags.
890 Unless you are debugging this driver, choose N.
892 config RTC_DS1685_SYSFS_REGS
893 bool "SysFS access to RTC register bits"
894 depends on RTC_DRV_DS1685_FAMILY && SYSFS
896 Enable this to provide access to the RTC control register bits
897 in /sys. Some of the bits are read-write, others are read-only.
899 Keep in mind that reading Control C's bits automatically clears
900 all pending IRQ flags - this can cause lost interrupts.
902 If you know that you need access to these bits, choose Y, Else N.
904 config RTC_DRV_DS1742
905 tristate "Maxim/Dallas DS1742/1743"
908 If you say yes here you get support for the
909 Maxim/Dallas DS1742/1743 timekeeping chip.
911 This driver can also be built as a module. If so, the module
912 will be called rtc-ds1742.
914 config RTC_DRV_DS2404
915 tristate "Maxim/Dallas DS2404"
917 If you say yes here you get support for the
918 Dallas DS2404 RTC chip.
920 This driver can also be built as a module. If so, the module
921 will be called rtc-ds2404.
923 config RTC_DRV_DA9052
924 tristate "Dialog DA9052/DA9053 RTC"
925 depends on PMIC_DA9052
927 Say y here to support the RTC driver for Dialog Semiconductor
928 DA9052-BC and DA9053-AA/Bx PMICs.
930 config RTC_DRV_DA9055
931 tristate "Dialog Semiconductor DA9055 RTC"
932 depends on MFD_DA9055
934 If you say yes here you will get support for the
935 RTC of the Dialog DA9055 PMIC.
937 This driver can also be built as a module. If so, the module
938 will be called rtc-da9055
940 config RTC_DRV_DA9063
941 tristate "Dialog Semiconductor DA9063 RTC"
942 depends on MFD_DA9063
944 If you say yes here you will get support for the RTC subsystem
945 of the Dialog Semiconductor DA9063.
947 This driver can also be built as a module. If so, the module
948 will be called "rtc-da9063".
952 depends on EFI && !X86
954 If you say yes here you will get support for the EFI
957 This driver can also be built as a module. If so, the module
958 will be called rtc-efi.
960 config RTC_DRV_STK17TA8
961 tristate "Simtek STK17TA8"
964 If you say yes here you get support for the
965 Simtek STK17TA8 timekeeping chip.
967 This driver can also be built as a module. If so, the module
968 will be called rtc-stk17ta8.
970 config RTC_DRV_M48T86
971 tristate "ST M48T86/Dallas DS12887"
973 If you say Y here you will get support for the
974 ST M48T86 and Dallas DS12887 RTC chips.
976 This driver can also be built as a module. If so, the module
977 will be called rtc-m48t86.
979 config RTC_DRV_M48T35
983 If you say Y here you will get support for the
986 This driver can also be built as a module, if so, the module
987 will be called "rtc-m48t35".
989 config RTC_DRV_M48T59
990 tristate "ST M48T59/M48T08/M48T02"
993 If you say Y here you will get support for the
994 ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
996 These chips are usually found in Sun SPARC and UltraSPARC
999 This driver can also be built as a module, if so, the module
1000 will be called "rtc-m48t59".
1002 config RTC_DRV_MSM6242
1003 tristate "Oki MSM6242"
1004 depends on HAS_IOMEM
1006 If you say yes here you get support for the Oki MSM6242
1007 timekeeping chip. It is used in some Amiga models (e.g. A2000).
1009 This driver can also be built as a module. If so, the module
1010 will be called rtc-msm6242.
1012 config RTC_DRV_BQ4802
1013 tristate "TI BQ4802"
1014 depends on HAS_IOMEM
1016 If you say Y here you will get support for the TI
1019 This driver can also be built as a module. If so, the module
1020 will be called rtc-bq4802.
1022 config RTC_DRV_RP5C01
1023 tristate "Ricoh RP5C01"
1024 depends on HAS_IOMEM
1026 If you say yes here you get support for the Ricoh RP5C01
1027 timekeeping chip. It is used in some Amiga models (e.g. A3000
1030 This driver can also be built as a module. If so, the module
1031 will be called rtc-rp5c01.
1033 config RTC_DRV_V3020
1034 tristate "EM Microelectronic V3020"
1036 If you say yes here you will get support for the
1037 EM Microelectronic v3020 RTC chip.
1039 This driver can also be built as a module. If so, the module
1040 will be called rtc-v3020.
1042 config RTC_DRV_WM831X
1043 tristate "Wolfson Microelectronics WM831x RTC"
1044 depends on MFD_WM831X
1046 If you say yes here you will get support for the RTC subsystem
1047 of the Wolfson Microelectronics WM831X series PMICs.
1049 This driver can also be built as a module. If so, the module
1050 will be called "rtc-wm831x".
1052 config RTC_DRV_WM8350
1053 tristate "Wolfson Microelectronics WM8350 RTC"
1054 depends on MFD_WM8350
1056 If you say yes here you will get support for the RTC subsystem
1057 of the Wolfson Microelectronics WM8350.
1059 This driver can also be built as a module. If so, the module
1060 will be called "rtc-wm8350".
1062 config RTC_DRV_SPEAR
1063 tristate "SPEAR ST RTC"
1064 depends on PLAT_SPEAR
1067 If you say Y here you will get support for the RTC found on
1070 config RTC_DRV_PCF50633
1071 depends on MFD_PCF50633
1072 tristate "NXP PCF50633 RTC"
1074 If you say yes here you get support for the RTC subsystem of the
1075 NXP PCF50633 used in embedded systems.
1077 config RTC_DRV_AB3100
1078 tristate "ST-Ericsson AB3100 RTC"
1079 depends on AB3100_CORE
1080 default y if AB3100_CORE
1082 Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC
1083 support. This chip contains a battery- and capacitor-backed RTC.
1085 config RTC_DRV_AB8500
1086 tristate "ST-Ericsson AB8500 RTC"
1087 depends on AB8500_CORE
1089 select RTC_INTF_DEV_UIE_EMUL
1091 Select this to enable the ST-Ericsson AB8500 power management IC RTC
1092 support. This chip contains a battery- and capacitor-backed RTC.
1094 config RTC_DRV_NUC900
1095 tristate "NUC910/NUC920 RTC driver"
1096 depends on ARCH_W90X900
1098 If you say yes here you get support for the RTC subsystem of the
1099 NUC910/NUC920 used in embedded systems.
1102 tristate "IBM OPAL RTC driver"
1103 depends on PPC_POWERNV
1106 If you say yes here you get support for the PowerNV platform RTC
1107 driver based on OPAL interfaces.
1109 This driver can also be built as a module. If so, the module
1110 will be called rtc-opal.
1112 comment "on-CPU RTC drivers"
1114 config RTC_DRV_DAVINCI
1115 tristate "TI DaVinci RTC"
1116 depends on ARCH_DAVINCI_DM365
1118 If you say yes here you get support for the RTC on the
1119 DaVinci platforms (DM365).
1121 This driver can also be built as a module. If so, the module
1122 will be called rtc-davinci.
1124 config RTC_DRV_DIGICOLOR
1125 tristate "Conexant Digicolor RTC"
1126 depends on ARCH_DIGICOLOR
1128 If you say yes here you get support for the RTC on Conexant
1129 Digicolor platforms. This currently includes the CX92755 SoC.
1131 This driver can also be built as a module. If so, the module
1132 will be called rtc-digicolor.
1134 config RTC_DRV_IMXDI
1135 tristate "Freescale IMX DryIce Real Time Clock"
1138 Support for Freescale IMX DryIce RTC
1140 This driver can also be built as a module, if so, the module
1141 will be called "rtc-imxdi".
1144 tristate "TI OMAP Real Time Clock"
1145 depends on ARCH_OMAP || ARCH_DAVINCI
1147 Say "yes" here to support the on chip real time clock
1148 present on TI OMAP1, AM33xx, DA8xx/OMAP-L13x, AM43xx and DRA7xx.
1150 This driver can also be built as a module, if so, module
1151 will be called rtc-omap.
1156 This will include RTC support for Samsung SoCs. If
1157 you want to include RTC support for any machine, kindly
1158 select this in the respective mach-XXXX/Kconfig file.
1161 tristate "Samsung S3C series SoC RTC"
1162 depends on ARCH_S3C64XX || HAVE_S3C_RTC
1164 RTC (Realtime Clock) driver for the clock inbuilt into the
1165 Samsung S3C24XX series of SoCs. This can provide periodic
1166 interrupt rates from 1Hz to 64Hz for user programs, and
1169 The driver currently supports the common features on all the
1170 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
1173 This driver can also be build as a module. If so, the module
1174 will be called rtc-s3c.
1176 config RTC_DRV_EP93XX
1177 tristate "Cirrus Logic EP93XX"
1178 depends on ARCH_EP93XX
1180 If you say yes here you get support for the
1181 RTC embedded in the Cirrus Logic EP93XX processors.
1183 This driver can also be built as a module. If so, the module
1184 will be called rtc-ep93xx.
1186 config RTC_DRV_SA1100
1187 tristate "SA11x0/PXA2xx/PXA910"
1188 depends on ARCH_SA1100 || ARCH_PXA || ARCH_MMP
1190 If you say Y here you will get access to the real time clock
1191 built into your SA11x0 or PXA2xx CPU.
1193 To compile this driver as a module, choose M here: the
1194 module will be called rtc-sa1100.
1197 tristate "SuperH On-Chip RTC"
1198 depends on SUPERH && HAVE_CLK
1200 Say Y here to enable support for the on-chip RTC found in
1201 most SuperH processors.
1203 To compile this driver as a module, choose M here: the
1204 module will be called rtc-sh.
1206 config RTC_DRV_VR41XX
1207 tristate "NEC VR41XX"
1208 depends on CPU_VR41XX
1210 If you say Y here you will get access to the real time clock
1211 built into your NEC VR41XX CPU.
1213 To compile this driver as a module, choose M here: the
1214 module will be called rtc-vr41xx.
1216 config RTC_DRV_PL030
1217 tristate "ARM AMBA PL030 RTC"
1220 If you say Y here you will get access to ARM AMBA
1221 PrimeCell PL030 RTC found on certain ARM SOCs.
1223 To compile this driver as a module, choose M here: the
1224 module will be called rtc-pl030.
1226 config RTC_DRV_PL031
1227 tristate "ARM AMBA PL031 RTC"
1230 If you say Y here you will get access to ARM AMBA
1231 PrimeCell PL031 RTC found on certain ARM SOCs.
1233 To compile this driver as a module, choose M here: the
1234 module will be called rtc-pl031.
1236 config RTC_DRV_AT32AP700X
1237 tristate "AT32AP700X series RTC"
1238 depends on PLATFORM_AT32AP
1240 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
1241 AT32AP700x family processors.
1243 config RTC_DRV_AT91RM9200
1244 tristate "AT91RM9200 or some AT91SAM9 RTC"
1245 depends on ARCH_AT91
1247 Driver for the internal RTC (Realtime Clock) module found on
1248 Atmel AT91RM9200's and some AT91SAM9 chips. On AT91SAM9 chips
1249 this is powered by the backup power supply.
1251 config RTC_DRV_AT91SAM9
1252 tristate "AT91SAM9 RTT as RTC"
1253 depends on ARCH_AT91
1256 Some AT91SAM9 SoCs provide an RTT (Real Time Timer) block which
1257 can be used as an RTC thanks to the backup power supply (e.g. a
1258 small coin cell battery) which keeps this block and the GPBR
1259 (General Purpose Backup Registers) block powered when the device
1261 Some AT91SAM9 SoCs provide a real RTC block, on those ones you'd
1262 probably want to use the real RTC block instead of the "RTT as an
1265 config RTC_DRV_AU1XXX
1266 tristate "Au1xxx Counter0 RTC support"
1267 depends on MIPS_ALCHEMY
1269 This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
1270 counter) to be used as a RTC.
1272 This driver can also be built as a module. If so, the module
1273 will be called rtc-au1xxx.
1276 tristate "Blackfin On-Chip RTC"
1277 depends on BLACKFIN && !BF561
1279 If you say yes here you will get support for the
1280 Blackfin On-Chip Real Time Clock.
1282 This driver can also be built as a module. If so, the module
1283 will be called rtc-bfin.
1285 config RTC_DRV_RS5C313
1286 tristate "Ricoh RS5C313"
1287 depends on SH_LANDISK
1289 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
1291 config RTC_DRV_GENERIC
1292 tristate "Generic RTC support"
1293 # Please consider writing a new RTC driver instead of using the generic
1295 depends on PARISC || M68K || PPC || SUPERH32
1297 Say Y or M here to enable RTC support on systems using the generic
1298 RTC abstraction. If you do not know what you are doing, you should
1302 tristate "PXA27x/PXA3xx"
1305 If you say Y here you will get access to the real time clock
1306 built into your PXA27x or PXA3xx CPU.
1308 This RTC driver uses PXA RTC registers available since pxa27x
1309 series (RDxR, RYxR) instead of legacy RCNR, RTAR.
1311 config RTC_DRV_VT8500
1312 tristate "VIA/WonderMedia 85xx SoC RTC"
1313 depends on ARCH_VT8500
1315 If you say Y here you will get access to the real time clock
1316 built into your VIA VT8500 SoC or its relatives.
1319 config RTC_DRV_SUN4V
1320 bool "SUN4V Hypervisor RTC"
1323 If you say Y here you will get support for the Hypervisor
1324 based RTC on SUN4V systems.
1326 config RTC_DRV_SUN6I
1327 tristate "Allwinner A31 RTC"
1328 depends on MACH_SUN6I || MACH_SUN8I
1330 If you say Y here you will get support for the RTC found on
1333 config RTC_DRV_SUNXI
1334 tristate "Allwinner sun4i/sun7i RTC"
1335 depends on MACH_SUN4I || MACH_SUN7I
1337 If you say Y here you will get support for the RTC found on
1340 config RTC_DRV_STARFIRE
1344 If you say Y here you will get support for the RTC found on
1347 config RTC_DRV_TX4939
1348 tristate "TX4939 SoC"
1349 depends on SOC_TX4939
1351 Driver for the internal RTC (Realtime Clock) module found on
1355 tristate "Marvell SoC RTC"
1356 depends on ARCH_DOVE || ARCH_MVEBU
1358 If you say yes here you will get support for the in-chip RTC
1359 that can be found in some of Marvell's SoC devices, such as
1360 the Kirkwood 88F6281 and 88F6192.
1362 This driver can also be built as a module. If so, the module
1363 will be called rtc-mv.
1365 config RTC_DRV_ARMADA38X
1366 tristate "Armada 38x Marvell SoC RTC"
1367 depends on ARCH_MVEBU
1369 If you say yes here you will get support for the in-chip RTC
1370 that can be found in the Armada 38x Marvell's SoC device
1372 This driver can also be built as a module. If so, the module
1373 will be called armada38x-rtc.
1379 If you say yes here you will get support for the RTC on PS3.
1381 This driver can also be built as a module. If so, the module
1382 will be called rtc-ps3.
1384 config RTC_DRV_COH901331
1385 tristate "ST-Ericsson COH 901 331 RTC"
1386 depends on ARCH_U300
1388 If you say Y here you will get access to ST-Ericsson
1389 COH 901 331 RTC clock found in some ST-Ericsson Mobile
1392 This driver can also be built as a module. If so, the module
1393 will be called "rtc-coh901331".
1397 tristate "Freescale STMP3xxx/i.MX23/i.MX28 RTC"
1400 If you say yes here you will get support for the onboard
1401 STMP3xxx/i.MX23/i.MX28 RTC.
1403 This driver can also be built as a module. If so, the module
1404 will be called rtc-stmp3xxx.
1410 If you say Y here you will get support for the RTC found on
1411 the PCAP2 ASIC used on some Motorola phones.
1413 config RTC_DRV_MC13XXX
1414 depends on MFD_MC13XXX
1415 tristate "Freescale MC13xxx RTC"
1417 This enables support for the RTCs found on Freescale's PMICs
1418 MC13783 and MC13892.
1420 config RTC_DRV_MPC5121
1421 tristate "Freescale MPC5121 built-in RTC"
1422 depends on PPC_MPC512x || PPC_MPC52xx
1424 If you say yes here you will get support for the
1425 built-in RTC on MPC5121 or on MPC5200.
1427 This driver can also be built as a module. If so, the module
1428 will be called rtc-mpc5121.
1430 config RTC_DRV_JZ4740
1431 tristate "Ingenic JZ4740 SoC"
1432 depends on MACH_JZ4740
1434 If you say yes here you get support for the Ingenic JZ4740 SoC RTC
1437 This driver can also be buillt as a module. If so, the module
1438 will be called rtc-jz4740.
1440 config RTC_DRV_LPC32XX
1441 depends on ARCH_LPC32XX
1442 tristate "NXP LPC32XX RTC"
1444 This enables support for the NXP RTC in the LPC32XX
1446 This driver can also be buillt as a module. If so, the module
1447 will be called rtc-lpc32xx.
1449 config RTC_DRV_PM8XXX
1450 tristate "Qualcomm PMIC8XXX RTC"
1451 depends on MFD_PM8XXX || MFD_SPMI_PMIC
1453 If you say yes here you get support for the
1454 Qualcomm PMIC8XXX RTC.
1456 To compile this driver as a module, choose M here: the
1457 module will be called rtc-pm8xxx.
1459 config RTC_DRV_TEGRA
1460 tristate "NVIDIA Tegra Internal RTC driver"
1461 depends on ARCH_TEGRA
1463 If you say yes here you get support for the
1464 Tegra 200 series internal RTC module.
1466 This drive can also be built as a module. If so, the module
1467 will be called rtc-tegra.
1470 tristate "Tilera hypervisor RTC support"
1473 Enable support for the Linux driver side of the Tilera
1474 hypervisor's real-time clock interface.
1477 tristate "PKUnity v3 RTC support"
1478 depends on ARCH_PUV3
1480 This enables support for the RTC in the PKUnity-v3 SoCs.
1482 This drive can also be built as a module. If so, the module
1483 will be called rtc-puv3.
1485 config RTC_DRV_LOONGSON1
1486 tristate "loongson1 RTC support"
1487 depends on MACH_LOONGSON1
1489 This is a driver for the loongson1 on-chip Counter0 (Time-Of-Year
1490 counter) to be used as a RTC.
1492 This driver can also be built as a module. If so, the module
1493 will be called rtc-ls1x.
1496 tristate "Freescale MXC Real Time Clock"
1499 If you say yes here you get support for the Freescale MXC
1502 This driver can also be built as a module, if so, the module
1503 will be called "rtc-mxc".
1506 tristate "Freescale SNVS RTC support"
1507 depends on HAS_IOMEM
1510 If you say yes here you get support for the Freescale SNVS
1511 Low Power (LP) RTC module.
1513 This driver can also be built as a module, if so, the module
1514 will be called "rtc-snvs".
1516 config RTC_DRV_SIRFSOC
1517 tristate "SiRFSOC RTC"
1518 depends on ARCH_SIRF
1520 Say "yes" here to support the real time clock on SiRF SOC chips.
1521 This driver can also be built as a module called rtc-sirfsoc.
1523 config RTC_DRV_MOXART
1524 tristate "MOXA ART RTC"
1525 depends on ARCH_MOXART || COMPILE_TEST
1527 If you say yes here you get support for the MOXA ART
1530 This driver can also be built as a module. If so, the module
1531 will be called rtc-moxart
1533 config RTC_DRV_XGENE
1534 tristate "APM X-Gene RTC"
1535 depends on HAS_IOMEM
1537 If you say yes here you get support for the APM X-Gene SoC real time
1540 This driver can also be built as a module, if so, the module
1541 will be called "rtc-xgene".
1543 comment "HID Sensor RTC drivers"
1545 config RTC_DRV_HID_SENSOR_TIME
1546 tristate "HID Sensor Time"
1549 select HID_SENSOR_HUB
1550 select HID_SENSOR_IIO_COMMON
1552 Say yes here to build support for the HID Sensors of type Time.
1553 This drivers makes such sensors available as RTCs.
1555 If this driver is compiled as a module, it will be named
1556 rtc-hid-sensor-time.