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 boolean "/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 boolean "/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 boolean "/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_AS3722
157 tristate "ams AS3722 RTC driver"
158 depends on MFD_AS3722
160 If you say yes here you get support for the RTC of ams AS3722 PMIC
163 This driver can also be built as a module. If so, the module
164 will be called rtc-as3722.
166 config RTC_DRV_DS1307
167 tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
169 If you say yes here you get support for various compatible RTC
170 chips (often with battery backup) connected with I2C. This driver
171 should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
172 EPSON RX-8025 and probably other chips. In some cases the RTC
173 must already have been initialized (by manufacturing or a
176 The first seven registers on these chips hold an RTC, and other
177 registers may add features such as NVRAM, a trickle charger for
178 the RTC/NVRAM backup power, and alarms. NVRAM is visible in
179 sysfs, but other chip features may not be available.
181 This driver can also be built as a module. If so, the module
182 will be called rtc-ds1307.
184 config RTC_DRV_DS1374
185 tristate "Dallas/Maxim DS1374"
188 If you say yes here you get support for Dallas Semiconductor
189 DS1374 real-time clock chips. If an interrupt is associated
190 with the device, the alarm functionality is supported.
192 This driver can also be built as a module. If so, the module
193 will be called rtc-ds1374.
195 config RTC_DRV_DS1374_WDT
196 bool "Dallas/Maxim DS1374 watchdog timer"
197 depends on RTC_DRV_DS1374
199 If you say Y here you will get support for the
200 watchdog timer in the Dallas Semiconductor DS1374
201 real-time clock chips.
203 config RTC_DRV_DS1672
204 tristate "Dallas/Maxim DS1672"
206 If you say yes here you get support for the
207 Dallas/Maxim DS1672 timekeeping chip.
209 This driver can also be built as a module. If so, the module
210 will be called rtc-ds1672.
212 config RTC_DRV_DS3232
213 tristate "Dallas/Maxim DS3232"
216 If you say yes here you get support for Dallas Semiconductor
217 DS3232 real-time clock chips. If an interrupt is associated
218 with the device, the alarm functionality is supported.
220 This driver can also be built as a module. If so, the module
221 will be called rtc-ds3232.
223 config RTC_DRV_HYM8563
224 tristate "Haoyu Microelectronics HYM8563"
227 Say Y to enable support for the HYM8563 I2C RTC chip. Apart
228 from the usual rtc functions it provides a clock output of
231 This driver can also be built as a module. If so, the module
232 will be called rtc-hym8563.
234 config RTC_DRV_LP8788
235 tristate "TI LP8788 RTC driver"
236 depends on MFD_LP8788
238 Say Y to enable support for the LP8788 RTC/ALARM driver.
240 config RTC_DRV_MAX6900
241 tristate "Maxim MAX6900"
243 If you say yes here you will get support for the
244 Maxim MAX6900 I2C RTC chip.
246 This driver can also be built as a module. If so, the module
247 will be called rtc-max6900.
249 config RTC_DRV_MAX8907
250 tristate "Maxim MAX8907"
251 depends on MFD_MAX8907
253 If you say yes here you will get support for the
254 RTC of Maxim MAX8907 PMIC.
256 This driver can also be built as a module. If so, the module
257 will be called rtc-max8907.
259 config RTC_DRV_MAX8925
260 tristate "Maxim MAX8925"
261 depends on MFD_MAX8925
263 If you say yes here you will get support for the
264 RTC of Maxim MAX8925 PMIC.
266 This driver can also be built as a module. If so, the module
267 will be called rtc-max8925.
269 config RTC_DRV_MAX8998
270 tristate "Maxim MAX8998"
271 depends on MFD_MAX8998
273 If you say yes here you will get support for the
274 RTC of Maxim MAX8998 PMIC.
276 This driver can also be built as a module. If so, the module
277 will be called rtc-max8998.
279 config RTC_DRV_MAX8997
280 tristate "Maxim MAX8997"
281 depends on MFD_MAX8997
283 If you say yes here you will get support for the
284 RTC of Maxim MAX8997 PMIC.
286 This driver can also be built as a module. If so, the module
287 will be called rtc-max8997.
289 config RTC_DRV_MAX77686
290 tristate "Maxim MAX77686"
291 depends on MFD_MAX77686
293 If you say yes here you will get support for the
294 RTC of Maxim MAX77686 PMIC.
296 This driver can also be built as a module. If so, the module
297 will be called rtc-max77686.
300 tristate "Rockchip RK808 RTC"
303 If you say yes here you will get support for the
306 This driver can also be built as a module. If so, the module
307 will be called rk808-rtc.
309 config RTC_DRV_MAX77802
310 tristate "Maxim 77802 RTC"
311 depends on MFD_MAX77686
313 If you say yes here you will get support for the
314 RTC of Maxim MAX77802 PMIC.
316 This driver can also be built as a module. If so, the module
317 will be called rtc-max77802.
319 config RTC_DRV_RS5C372
320 tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
322 If you say yes here you get support for the
323 Ricoh R2025S/D, RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
325 This driver can also be built as a module. If so, the module
326 will be called rtc-rs5c372.
328 config RTC_DRV_ISL1208
329 tristate "Intersil ISL1208"
331 If you say yes here you get support for the
332 Intersil ISL1208 RTC chip.
334 This driver can also be built as a module. If so, the module
335 will be called rtc-isl1208.
337 config RTC_DRV_ISL12022
338 tristate "Intersil ISL12022"
340 If you say yes here you get support for the
341 Intersil ISL12022 RTC chip.
343 This driver can also be built as a module. If so, the module
344 will be called rtc-isl12022.
346 config RTC_DRV_ISL12057
349 tristate "Intersil ISL12057"
351 If you say yes here you get support for the Intersil ISL12057
354 This driver can also be built as a module. If so, the module
355 will be called rtc-isl12057.
358 tristate "Xicor/Intersil X1205"
360 If you say yes here you get support for the
361 Xicor/Intersil X1205 RTC chip.
363 This driver can also be built as a module. If so, the module
364 will be called rtc-x1205.
366 config RTC_DRV_PALMAS
367 tristate "TI Palmas RTC driver"
368 depends on MFD_PALMAS
370 If you say yes here you get support for the RTC of TI PALMA series PMIC
373 This driver can also be built as a module. If so, the module
374 will be called rtc-palma.
376 config RTC_DRV_PCF2127
377 tristate "NXP PCF2127"
379 If you say yes here you get support for the NXP PCF2127/29 RTC
382 This driver can also be built as a module. If so, the module
383 will be called rtc-pcf2127.
385 config RTC_DRV_PCF8523
386 tristate "NXP PCF8523"
388 If you say yes here you get support for the NXP PCF8523 RTC
391 This driver can also be built as a module. If so, the module
392 will be called rtc-pcf8523.
394 config RTC_DRV_PCF8563
395 tristate "Philips PCF8563/Epson RTC8564"
397 If you say yes here you get support for the
398 Philips PCF8563 RTC chip. The Epson RTC8564
401 This driver can also be built as a module. If so, the module
402 will be called rtc-pcf8563.
404 config RTC_DRV_PCF85063
405 tristate "nxp PCF85063"
407 If you say yes here you get support for the PCF85063 RTC chip
409 This driver can also be built as a module. If so, the module
410 will be called rtc-pcf85063.
412 config RTC_DRV_PCF8583
413 tristate "Philips PCF8583"
415 If you say yes here you get support for the Philips PCF8583
416 RTC chip found on Acorn RiscPCs. This driver supports the
417 platform specific method of retrieving the current year from
418 the RTC's SRAM. It will work on other platforms with the same
419 chip, but the year will probably have to be tweaked.
421 This driver can also be built as a module. If so, the module
422 will be called rtc-pcf8583.
424 config RTC_DRV_M41T80
425 tristate "ST M41T62/65/M41T80/81/82/83/84/85/87 and compatible"
427 If you say Y here you will get support for the ST M41T60
428 and M41T80 RTC chips series. Currently, the following chips are
429 supported: M41T62, M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
430 M41ST85, M41ST87, and MicroCrystal RV4162.
432 This driver can also be built as a module. If so, the module
433 will be called rtc-m41t80.
435 config RTC_DRV_M41T80_WDT
436 bool "ST M41T65/M41T80 series RTC watchdog timer"
437 depends on RTC_DRV_M41T80
439 If you say Y here you will get support for the
440 watchdog timer in the ST M41T60 and M41T80 RTC chips series.
443 tristate "TI BQ32000"
445 If you say Y here you will get support for the TI
446 BQ32000 I2C RTC chip.
448 This driver can also be built as a module. If so, the module
449 will be called rtc-bq32k.
451 config RTC_DRV_DM355EVM
452 tristate "TI DaVinci DM355 EVM RTC"
453 depends on MFD_DM355EVM_MSP
455 Supports the RTC firmware in the MSP430 on the DM355 EVM.
457 config RTC_DRV_TWL92330
458 boolean "TI TWL92330/Menelaus"
461 If you say yes here you get support for the RTC on the
462 TWL92330 "Menelaus" power management chip, used with OMAP2
463 platforms. The support is integrated with the rest of
464 the Menelaus driver; it's not separate module.
466 config RTC_DRV_TWL4030
467 tristate "TI TWL4030/TWL5030/TWL6030/TPS659x0"
468 depends on TWL4030_CORE
470 If you say yes here you get support for the RTC on the
471 TWL4030/TWL5030/TWL6030 family chips, used mostly with OMAP3 platforms.
473 This driver can also be built as a module. If so, the module
474 will be called rtc-twl.
476 config RTC_DRV_TPS6586X
477 tristate "TI TPS6586X RTC driver"
478 depends on MFD_TPS6586X
480 TI Power Management IC TPS6586X supports RTC functionality
481 along with alarm. This driver supports the RTC driver for
482 the TPS6586X RTC module.
484 config RTC_DRV_TPS65910
485 tristate "TI TPS65910 RTC driver"
486 depends on RTC_CLASS && MFD_TPS65910
488 If you say yes here you get support for the RTC on the
491 This driver can also be built as a module. If so, the module
492 will be called rtc-tps65910.
494 config RTC_DRV_TPS80031
495 tristate "TI TPS80031/TPS80032 RTC driver"
496 depends on MFD_TPS80031
498 TI Power Management IC TPS80031 supports RTC functionality
499 along with alarm. This driver supports the RTC driver for
500 the TPS80031 RTC module.
502 config RTC_DRV_RC5T583
503 tristate "RICOH 5T583 RTC driver"
504 depends on MFD_RC5T583
506 If you say yes here you get support for the RTC on the
509 This driver can also be built as a module. If so, the module
510 will be called rtc-rc5t583.
512 config RTC_DRV_S35390A
513 tristate "Seiko Instruments S-35390A"
516 If you say yes here you will get support for the Seiko
517 Instruments S-35390A.
519 This driver can also be built as a module. If so the module
520 will be called rtc-s35390a.
522 config RTC_DRV_FM3130
523 tristate "Ramtron FM3130"
525 If you say Y here you will get support for the
526 Ramtron FM3130 RTC chips.
527 Ramtron FM3130 is a chip with two separate devices inside,
528 RTC clock and FRAM. This driver provides only RTC functionality.
530 This driver can also be built as a module. If so the module
531 will be called rtc-fm3130.
533 config RTC_DRV_RX8581
534 tristate "Epson RX-8581"
536 If you say yes here you will get support for the Epson RX-8581.
538 This driver can also be built as a module. If so the module
539 will be called rtc-rx8581.
541 config RTC_DRV_RX8025
542 tristate "Epson RX-8025SA/NB"
544 If you say yes here you get support for the Epson
545 RX-8025SA/NB RTC chips.
547 This driver can also be built as a module. If so, the module
548 will be called rtc-rx8025.
550 config RTC_DRV_EM3027
551 tristate "EM Microelectronic EM3027"
553 If you say yes here you get support for the EM
554 Microelectronic EM3027 RTC chips.
556 This driver can also be built as a module. If so, the module
557 will be called rtc-em3027.
559 config RTC_DRV_RV3029C2
560 tristate "Micro Crystal RTC"
562 If you say yes here you get support for the Micro Crystal
565 This driver can also be built as a module. If so, the module
566 will be called rtc-rv3029c2.
569 tristate "Samsung S2M/S5M series"
570 depends on MFD_SEC_CORE
572 If you say yes here you will get support for the
573 RTC of Samsung S2MPS14 and S5M PMIC series.
575 This driver can also be built as a module. If so, the module
576 will be called rtc-s5m.
580 comment "SPI RTC drivers"
584 config RTC_DRV_M41T93
587 If you say yes here you will get support for the
588 ST M41T93 SPI RTC chip.
590 This driver can also be built as a module. If so, the module
591 will be called rtc-m41t93.
593 config RTC_DRV_M41T94
596 If you say yes here you will get support for the
597 ST M41T94 SPI RTC chip.
599 This driver can also be built as a module. If so, the module
600 will be called rtc-m41t94.
602 config RTC_DRV_DS1305
603 tristate "Dallas/Maxim DS1305/DS1306"
605 Select this driver to get support for the Dallas/Maxim DS1305
606 and DS1306 real time clock chips. These support a trickle
607 charger, alarms, and NVRAM in addition to the clock.
609 This driver can also be built as a module. If so, the module
610 will be called rtc-ds1305.
612 config RTC_DRV_DS1343
614 tristate "Dallas/Maxim DS1343/DS1344"
616 If you say yes here you get support for the
617 Dallas/Maxim DS1343 and DS1344 real time clock chips.
618 Support for trickle charger, alarm is provided.
620 This driver can also be built as a module. If so, the module
621 will be called rtc-ds1343.
623 config RTC_DRV_DS1347
624 tristate "Dallas/Maxim DS1347"
626 If you say yes here you get support for the
627 Dallas/Maxim DS1347 chips.
629 This driver only supports the RTC feature, and not other chip
630 features such as alarms.
632 This driver can also be built as a module. If so, the module
633 will be called rtc-ds1347.
635 config RTC_DRV_DS1390
636 tristate "Dallas/Maxim DS1390/93/94"
638 If you say yes here you get support for the
639 Dallas/Maxim DS1390/93/94 chips.
641 This driver only supports the RTC feature, and not other chip
642 features such as alarms and trickle charging.
644 This driver can also be built as a module. If so, the module
645 will be called rtc-ds1390.
647 config RTC_DRV_MAX6902
648 tristate "Maxim MAX6902"
650 If you say yes here you will get support for the
651 Maxim MAX6902 SPI RTC chip.
653 This driver can also be built as a module. If so, the module
654 will be called rtc-max6902.
657 tristate "Epson RTC-9701JE"
659 If you say yes here you will get support for the
660 Epson RTC-9701JE SPI RTC chip.
662 This driver can also be built as a module. If so, the module
663 will be called rtc-r9701.
665 config RTC_DRV_RS5C348
666 tristate "Ricoh RS5C348A/B"
668 If you say yes here you get support for the
669 Ricoh RS5C348A and RS5C348B RTC chips.
671 This driver can also be built as a module. If so, the module
672 will be called rtc-rs5c348.
674 config RTC_DRV_DS3234
675 tristate "Maxim/Dallas DS3234"
677 If you say yes here you get support for the
678 Maxim/Dallas DS3234 SPI RTC chip.
680 This driver can also be built as a module. If so, the module
681 will be called rtc-ds3234.
683 config RTC_DRV_PCF2123
684 tristate "NXP PCF2123"
686 If you say yes here you get support for the NXP PCF2123
689 This driver can also be built as a module. If so, the module
690 will be called rtc-pcf2123.
692 config RTC_DRV_RX4581
693 tristate "Epson RX-4581"
695 If you say yes here you will get support for the Epson RX-4581.
697 This driver can also be built as a module. If so the module
698 will be called rtc-rx4581.
700 config RTC_DRV_MCP795
701 tristate "Microchip MCP795"
703 If you say yes here you will get support for the Microchip MCP795.
705 This driver can also be built as a module. If so the module
706 will be called rtc-mcp795.
710 comment "Platform RTC drivers"
712 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
713 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
714 # global rtc_lock ... it's not yet just another platform_device.
717 tristate "PC-style 'CMOS'"
718 depends on X86 || ARM || M32R || PPC || MIPS || SPARC64
721 Say "yes" here to get direct support for the real time clock
722 found in every PC or ACPI-based system, and some other boards.
723 Specifically the original MC146818, compatibles like those in
724 PC south bridges, the DS12887 or M48T86, some multifunction
725 or LPC bus chips, and so on.
727 Your system will need to define the platform device used by
728 this driver, otherwise it won't be accessible. This means
729 you can safely enable this driver if you don't know whether
730 or not your board has this kind of hardware.
732 This driver can also be built as a module. If so, the module
733 will be called rtc-cmos.
736 bool "Alpha PC-style CMOS"
740 Direct support for the real-time clock found on every Alpha
741 system, specifically MC146818 compatibles. If in doubt, say Y.
744 tristate "Virtual RTC for Intel MID platforms"
745 depends on X86_INTEL_MID
746 default y if X86_INTEL_MID
749 Say "yes" here to get direct support for the real time clock
750 found on Moorestown platforms. The VRTC is a emulated RTC that
751 derives its clock source from a real RTC in the PMIC. The MC146818
752 style programming interface is mostly conserved, but any
753 updates are done via IPC calls to the system controller FW.
755 config RTC_DRV_DS1216
756 tristate "Dallas DS1216"
759 If you say yes here you get support for the Dallas DS1216 RTC chips.
761 config RTC_DRV_DS1286
762 tristate "Dallas DS1286"
765 If you say yes here you get support for the Dallas DS1286 RTC chips.
767 config RTC_DRV_DS1302
768 tristate "Dallas DS1302"
769 depends on SH_SECUREEDGE5410
771 If you say yes here you get support for the Dallas DS1302 RTC chips.
773 config RTC_DRV_DS1511
774 tristate "Dallas DS1511"
777 If you say yes here you get support for the
778 Dallas DS1511 timekeeping/watchdog chip.
780 This driver can also be built as a module. If so, the module
781 will be called rtc-ds1511.
783 config RTC_DRV_DS1553
784 tristate "Maxim/Dallas DS1553"
787 If you say yes here you get support for the
788 Maxim/Dallas DS1553 timekeeping chip.
790 This driver can also be built as a module. If so, the module
791 will be called rtc-ds1553.
793 config RTC_DRV_DS1742
794 tristate "Maxim/Dallas DS1742/1743"
797 If you say yes here you get support for the
798 Maxim/Dallas DS1742/1743 timekeeping chip.
800 This driver can also be built as a module. If so, the module
801 will be called rtc-ds1742.
803 config RTC_DRV_DS2404
804 tristate "Maxim/Dallas DS2404"
806 If you say yes here you get support for the
807 Dallas DS2404 RTC chip.
809 This driver can also be built as a module. If so, the module
810 will be called rtc-ds2404.
812 config RTC_DRV_DA9052
813 tristate "Dialog DA9052/DA9053 RTC"
814 depends on PMIC_DA9052
816 Say y here to support the RTC driver for Dialog Semiconductor
817 DA9052-BC and DA9053-AA/Bx PMICs.
819 config RTC_DRV_DA9055
820 tristate "Dialog Semiconductor DA9055 RTC"
821 depends on MFD_DA9055
823 If you say yes here you will get support for the
824 RTC of the Dialog DA9055 PMIC.
826 This driver can also be built as a module. If so, the module
827 will be called rtc-da9055
829 config RTC_DRV_DA9063
830 tristate "Dialog Semiconductor DA9063 RTC"
831 depends on MFD_DA9063
833 If you say yes here you will get support for the RTC subsystem
834 of the Dialog Semiconductor DA9063.
836 This driver can also be built as a module. If so, the module
837 will be called "rtc-da9063".
841 depends on EFI && !X86
843 If you say yes here you will get support for the EFI
846 This driver can also be built as a module. If so, the module
847 will be called rtc-efi.
849 config RTC_DRV_STK17TA8
850 tristate "Simtek STK17TA8"
853 If you say yes here you get support for the
854 Simtek STK17TA8 timekeeping chip.
856 This driver can also be built as a module. If so, the module
857 will be called rtc-stk17ta8.
859 config RTC_DRV_M48T86
860 tristate "ST M48T86/Dallas DS12887"
862 If you say Y here you will get support for the
863 ST M48T86 and Dallas DS12887 RTC chips.
865 This driver can also be built as a module. If so, the module
866 will be called rtc-m48t86.
868 config RTC_DRV_M48T35
872 If you say Y here you will get support for the
875 This driver can also be built as a module, if so, the module
876 will be called "rtc-m48t35".
878 config RTC_DRV_M48T59
879 tristate "ST M48T59/M48T08/M48T02"
882 If you say Y here you will get support for the
883 ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
885 These chips are usually found in Sun SPARC and UltraSPARC
888 This driver can also be built as a module, if so, the module
889 will be called "rtc-m48t59".
891 config RTC_DRV_MSM6242
892 tristate "Oki MSM6242"
895 If you say yes here you get support for the Oki MSM6242
896 timekeeping chip. It is used in some Amiga models (e.g. A2000).
898 This driver can also be built as a module. If so, the module
899 will be called rtc-msm6242.
901 config RTC_DRV_BQ4802
905 If you say Y here you will get support for the TI
908 This driver can also be built as a module. If so, the module
909 will be called rtc-bq4802.
911 config RTC_DRV_RP5C01
912 tristate "Ricoh RP5C01"
915 If you say yes here you get support for the Ricoh RP5C01
916 timekeeping chip. It is used in some Amiga models (e.g. A3000
919 This driver can also be built as a module. If so, the module
920 will be called rtc-rp5c01.
923 tristate "EM Microelectronic V3020"
925 If you say yes here you will get support for the
926 EM Microelectronic v3020 RTC chip.
928 This driver can also be built as a module. If so, the module
929 will be called rtc-v3020.
931 config RTC_DRV_WM831X
932 tristate "Wolfson Microelectronics WM831x RTC"
933 depends on MFD_WM831X
935 If you say yes here you will get support for the RTC subsystem
936 of the Wolfson Microelectronics WM831X series PMICs.
938 This driver can also be built as a module. If so, the module
939 will be called "rtc-wm831x".
941 config RTC_DRV_WM8350
942 tristate "Wolfson Microelectronics WM8350 RTC"
943 depends on MFD_WM8350
945 If you say yes here you will get support for the RTC subsystem
946 of the Wolfson Microelectronics WM8350.
948 This driver can also be built as a module. If so, the module
949 will be called "rtc-wm8350".
952 tristate "SPEAR ST RTC"
953 depends on PLAT_SPEAR
956 If you say Y here you will get support for the RTC found on
959 config RTC_DRV_PCF50633
960 depends on MFD_PCF50633
961 tristate "NXP PCF50633 RTC"
963 If you say yes here you get support for the RTC subsystem of the
964 NXP PCF50633 used in embedded systems.
966 config RTC_DRV_AB3100
967 tristate "ST-Ericsson AB3100 RTC"
968 depends on AB3100_CORE
969 default y if AB3100_CORE
971 Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC
972 support. This chip contains a battery- and capacitor-backed RTC.
974 config RTC_DRV_AB8500
975 tristate "ST-Ericsson AB8500 RTC"
976 depends on AB8500_CORE
978 select RTC_INTF_DEV_UIE_EMUL
980 Select this to enable the ST-Ericsson AB8500 power management IC RTC
981 support. This chip contains a battery- and capacitor-backed RTC.
983 config RTC_DRV_NUC900
984 tristate "NUC910/NUC920 RTC driver"
985 depends on ARCH_W90X900
987 If you say yes here you get support for the RTC subsystem of the
988 NUC910/NUC920 used in embedded systems.
990 comment "on-CPU RTC drivers"
992 config RTC_DRV_DAVINCI
993 tristate "TI DaVinci RTC"
994 depends on ARCH_DAVINCI_DM365
996 If you say yes here you get support for the RTC on the
997 DaVinci platforms (DM365).
999 This driver can also be built as a module. If so, the module
1000 will be called rtc-davinci.
1002 config RTC_DRV_IMXDI
1003 tristate "Freescale IMX DryIce Real Time Clock"
1006 Support for Freescale IMX DryIce RTC
1008 This driver can also be built as a module, if so, the module
1009 will be called "rtc-imxdi".
1013 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730 || ARCH_DAVINCI_DA8XX || SOC_AM33XX
1015 Say "yes" here to support the on chip real time clock
1016 present on TI OMAP1, AM33xx and DA8xx/OMAP-L13x.
1018 This driver can also be built as a module, if so, module
1019 will be called rtc-omap.
1024 This will include RTC support for Samsung SoCs. If
1025 you want to include RTC support for any machine, kindly
1026 select this in the respective mach-XXXX/Kconfig file.
1029 tristate "Samsung S3C series SoC RTC"
1030 depends on ARCH_S3C64XX || HAVE_S3C_RTC
1032 RTC (Realtime Clock) driver for the clock inbuilt into the
1033 Samsung S3C24XX series of SoCs. This can provide periodic
1034 interrupt rates from 1Hz to 64Hz for user programs, and
1037 The driver currently supports the common features on all the
1038 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
1041 This driver can also be build as a module. If so, the module
1042 will be called rtc-s3c.
1044 config RTC_DRV_EP93XX
1045 tristate "Cirrus Logic EP93XX"
1046 depends on ARCH_EP93XX
1048 If you say yes here you get support for the
1049 RTC embedded in the Cirrus Logic EP93XX processors.
1051 This driver can also be built as a module. If so, the module
1052 will be called rtc-ep93xx.
1054 config RTC_DRV_SA1100
1055 tristate "SA11x0/PXA2xx/PXA910"
1056 depends on ARCH_SA1100 || ARCH_PXA || ARCH_MMP
1058 If you say Y here you will get access to the real time clock
1059 built into your SA11x0 or PXA2xx CPU.
1061 To compile this driver as a module, choose M here: the
1062 module will be called rtc-sa1100.
1065 tristate "SuperH On-Chip RTC"
1066 depends on SUPERH && HAVE_CLK
1068 Say Y here to enable support for the on-chip RTC found in
1069 most SuperH processors.
1071 To compile this driver as a module, choose M here: the
1072 module will be called rtc-sh.
1074 config RTC_DRV_VR41XX
1075 tristate "NEC VR41XX"
1076 depends on CPU_VR41XX
1078 If you say Y here you will get access to the real time clock
1079 built into your NEC VR41XX CPU.
1081 To compile this driver as a module, choose M here: the
1082 module will be called rtc-vr41xx.
1084 config RTC_DRV_PL030
1085 tristate "ARM AMBA PL030 RTC"
1088 If you say Y here you will get access to ARM AMBA
1089 PrimeCell PL030 RTC found on certain ARM SOCs.
1091 To compile this driver as a module, choose M here: the
1092 module will be called rtc-pl030.
1094 config RTC_DRV_PL031
1095 tristate "ARM AMBA PL031 RTC"
1098 If you say Y here you will get access to ARM AMBA
1099 PrimeCell PL031 RTC found on certain ARM SOCs.
1101 To compile this driver as a module, choose M here: the
1102 module will be called rtc-pl031.
1104 config RTC_DRV_AT32AP700X
1105 tristate "AT32AP700X series RTC"
1106 depends on PLATFORM_AT32AP
1108 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
1109 AT32AP700x family processors.
1111 config RTC_DRV_AT91RM9200
1112 tristate "AT91RM9200 or some AT91SAM9 RTC"
1113 depends on ARCH_AT91
1115 Driver for the internal RTC (Realtime Clock) module found on
1116 Atmel AT91RM9200's and some AT91SAM9 chips. On AT91SAM9 chips
1117 this is powered by the backup power supply.
1119 config RTC_DRV_AT91SAM9
1120 tristate "AT91SAM9 RTT as RTC"
1121 depends on ARCH_AT91
1124 Some AT91SAM9 SoCs provide an RTT (Real Time Timer) block which
1125 can be used as an RTC thanks to the backup power supply (e.g. a
1126 small coin cell battery) which keeps this block and the GPBR
1127 (General Purpose Backup Registers) block powered when the device
1129 Some AT91SAM9 SoCs provide a real RTC block, on those ones you'd
1130 probably want to use the real RTC block instead of the "RTT as an
1133 config RTC_DRV_AT91SAM9_RTT
1137 depends on RTC_DRV_AT91SAM9
1139 This option is only relevant for legacy board support and
1140 won't be used when booting a DT board.
1142 More than one RTT module is available. You can choose which
1143 one will be used as an RTC. The default of zero is normally
1144 OK to use, though some systems use that for non-RTC purposes.
1146 config RTC_DRV_AT91SAM9_GPBR
1150 prompt "Backup Register Number"
1151 depends on RTC_DRV_AT91SAM9
1153 This option is only relevant for legacy board support and
1154 won't be used when booting a DT board.
1156 The RTC driver needs to use one of the General Purpose Backup
1157 Registers (GPBRs) as well as the RTT. You can choose which one
1158 will be used. The default of zero is normally OK to use, but
1159 on some systems other software needs to use that register.
1161 config RTC_DRV_AU1XXX
1162 tristate "Au1xxx Counter0 RTC support"
1163 depends on MIPS_ALCHEMY
1165 This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
1166 counter) to be used as a RTC.
1168 This driver can also be built as a module. If so, the module
1169 will be called rtc-au1xxx.
1172 tristate "Blackfin On-Chip RTC"
1173 depends on BLACKFIN && !BF561
1175 If you say yes here you will get support for the
1176 Blackfin On-Chip Real Time Clock.
1178 This driver can also be built as a module. If so, the module
1179 will be called rtc-bfin.
1181 config RTC_DRV_RS5C313
1182 tristate "Ricoh RS5C313"
1183 depends on SH_LANDISK
1185 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
1187 config RTC_DRV_GENERIC
1188 tristate "Generic RTC support"
1189 # Please consider writing a new RTC driver instead of using the generic
1191 depends on PARISC || M68K || PPC || SUPERH32
1193 Say Y or M here to enable RTC support on systems using the generic
1194 RTC abstraction. If you do not know what you are doing, you should
1198 tristate "PXA27x/PXA3xx"
1201 If you say Y here you will get access to the real time clock
1202 built into your PXA27x or PXA3xx CPU.
1204 This RTC driver uses PXA RTC registers available since pxa27x
1205 series (RDxR, RYxR) instead of legacy RCNR, RTAR.
1207 config RTC_DRV_VT8500
1208 tristate "VIA/WonderMedia 85xx SoC RTC"
1209 depends on ARCH_VT8500
1211 If you say Y here you will get access to the real time clock
1212 built into your VIA VT8500 SoC or its relatives.
1215 config RTC_DRV_SUN4V
1216 bool "SUN4V Hypervisor RTC"
1219 If you say Y here you will get support for the Hypervisor
1220 based RTC on SUN4V systems.
1222 config RTC_DRV_SUN6I
1223 tristate "Allwinner A31 RTC"
1224 depends on MACH_SUN6I || MACH_SUN8I
1226 If you say Y here you will get support for the RTC found on
1229 config RTC_DRV_SUNXI
1230 tristate "Allwinner sun4i/sun7i RTC"
1231 depends on MACH_SUN4I || MACH_SUN7I
1233 If you say Y here you will get support for the RTC found on
1236 config RTC_DRV_STARFIRE
1240 If you say Y here you will get support for the RTC found on
1243 config RTC_DRV_TX4939
1244 tristate "TX4939 SoC"
1245 depends on SOC_TX4939
1247 Driver for the internal RTC (Realtime Clock) module found on
1251 tristate "Marvell SoC RTC"
1252 depends on ARCH_DOVE || ARCH_MVEBU
1254 If you say yes here you will get support for the in-chip RTC
1255 that can be found in some of Marvell's SoC devices, such as
1256 the Kirkwood 88F6281 and 88F6192.
1258 This driver can also be built as a module. If so, the module
1259 will be called rtc-mv.
1265 If you say yes here you will get support for the RTC on PS3.
1267 This driver can also be built as a module. If so, the module
1268 will be called rtc-ps3.
1270 config RTC_DRV_COH901331
1271 tristate "ST-Ericsson COH 901 331 RTC"
1272 depends on ARCH_U300
1274 If you say Y here you will get access to ST-Ericsson
1275 COH 901 331 RTC clock found in some ST-Ericsson Mobile
1278 This driver can also be built as a module. If so, the module
1279 will be called "rtc-coh901331".
1283 tristate "Freescale STMP3xxx/i.MX23/i.MX28 RTC"
1286 If you say yes here you will get support for the onboard
1287 STMP3xxx/i.MX23/i.MX28 RTC.
1289 This driver can also be built as a module. If so, the module
1290 will be called rtc-stmp3xxx.
1296 If you say Y here you will get support for the RTC found on
1297 the PCAP2 ASIC used on some Motorola phones.
1299 config RTC_DRV_MC13XXX
1300 depends on MFD_MC13XXX
1301 tristate "Freescale MC13xxx RTC"
1303 This enables support for the RTCs found on Freescale's PMICs
1304 MC13783 and MC13892.
1306 config RTC_DRV_MPC5121
1307 tristate "Freescale MPC5121 built-in RTC"
1308 depends on PPC_MPC512x || PPC_MPC52xx
1310 If you say yes here you will get support for the
1311 built-in RTC on MPC5121 or on MPC5200.
1313 This driver can also be built as a module. If so, the module
1314 will be called rtc-mpc5121.
1316 config RTC_DRV_JZ4740
1317 tristate "Ingenic JZ4740 SoC"
1318 depends on MACH_JZ4740
1320 If you say yes here you get support for the Ingenic JZ4740 SoC RTC
1323 This driver can also be buillt as a module. If so, the module
1324 will be called rtc-jz4740.
1326 config RTC_DRV_LPC32XX
1327 depends on ARCH_LPC32XX
1328 tristate "NXP LPC32XX RTC"
1330 This enables support for the NXP RTC in the LPC32XX
1332 This driver can also be buillt as a module. If so, the module
1333 will be called rtc-lpc32xx.
1335 config RTC_DRV_PM8XXX
1336 tristate "Qualcomm PMIC8XXX RTC"
1337 depends on MFD_PM8XXX || MFD_SPMI_PMIC
1339 If you say yes here you get support for the
1340 Qualcomm PMIC8XXX RTC.
1342 To compile this driver as a module, choose M here: the
1343 module will be called rtc-pm8xxx.
1345 config RTC_DRV_TEGRA
1346 tristate "NVIDIA Tegra Internal RTC driver"
1347 depends on ARCH_TEGRA
1349 If you say yes here you get support for the
1350 Tegra 200 series internal RTC module.
1352 This drive can also be built as a module. If so, the module
1353 will be called rtc-tegra.
1356 tristate "Tilera hypervisor RTC support"
1359 Enable support for the Linux driver side of the Tilera
1360 hypervisor's real-time clock interface.
1363 tristate "PKUnity v3 RTC support"
1364 depends on ARCH_PUV3
1366 This enables support for the RTC in the PKUnity-v3 SoCs.
1368 This drive can also be built as a module. If so, the module
1369 will be called rtc-puv3.
1371 config RTC_DRV_LOONGSON1
1372 tristate "loongson1 RTC support"
1373 depends on MACH_LOONGSON1
1375 This is a driver for the loongson1 on-chip Counter0 (Time-Of-Year
1376 counter) to be used as a RTC.
1378 This driver can also be built as a module. If so, the module
1379 will be called rtc-ls1x.
1382 tristate "Freescale MXC Real Time Clock"
1385 If you say yes here you get support for the Freescale MXC
1388 This driver can also be built as a module, if so, the module
1389 will be called "rtc-mxc".
1392 tristate "Freescale SNVS RTC support"
1393 depends on HAS_IOMEM
1396 If you say yes here you get support for the Freescale SNVS
1397 Low Power (LP) RTC module.
1399 This driver can also be built as a module, if so, the module
1400 will be called "rtc-snvs".
1402 config RTC_DRV_SIRFSOC
1403 tristate "SiRFSOC RTC"
1404 depends on ARCH_SIRF
1406 Say "yes" here to support the real time clock on SiRF SOC chips.
1407 This driver can also be built as a module called rtc-sirfsoc.
1409 config RTC_DRV_MOXART
1410 tristate "MOXA ART RTC"
1411 depends on ARCH_MOXART || COMPILE_TEST
1413 If you say yes here you get support for the MOXA ART
1416 This driver can also be built as a module. If so, the module
1417 will be called rtc-moxart
1419 config RTC_DRV_XGENE
1420 tristate "APM X-Gene RTC"
1421 depends on HAS_IOMEM
1423 If you say yes here you get support for the APM X-Gene SoC real time
1426 This driver can also be built as a module, if so, the module
1427 will be called "rtc-xgene".
1429 comment "HID Sensor RTC drivers"
1431 config RTC_DRV_HID_SENSOR_TIME
1432 tristate "HID Sensor Time"
1435 select HID_SENSOR_HUB
1436 select HID_SENSOR_IIO_COMMON
1438 Say yes here to build support for the HID Sensors of type Time.
1439 This drivers makes such sensors available as RTCs.
1441 If this driver is compiled as a module, it will be named
1442 rtc-hid-sensor-time.