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.
109 tristate "Test driver/device"
111 If you say yes here you get support for the
112 RTC test driver. It's a software RTC which can be
113 used to test the RTC subsystem APIs. It gets
114 the time from the system clock.
115 You want this driver only if you are doing development
116 on the RTC subsystem. Please read the source code
119 This driver can also be built as a module. If so, the module
120 will be called rtc-test.
122 comment "I2C RTC drivers"
127 config RTC_DRV_DS1307
128 tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00"
130 If you say yes here you get support for various compatible RTC
131 chips (often with battery backup) connected with I2C. This driver
132 should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
133 and probably other chips. In some cases the RTC must already
134 have been initialized (by manufacturing or a bootloader).
136 The first seven registers on these chips hold an RTC, and other
137 registers may add features such as NVRAM, a trickle charger for
138 the RTC/NVRAM backup power, and alarms. NVRAM is visible in
139 sysfs, but other chip features may not be available.
141 This driver can also be built as a module. If so, the module
142 will be called rtc-ds1307.
144 config RTC_DRV_DS1374
145 tristate "Dallas/Maxim DS1374"
146 depends on RTC_CLASS && I2C
148 If you say yes here you get support for Dallas Semiconductor
149 DS1374 real-time clock chips. If an interrupt is associated
150 with the device, the alarm functionality is supported.
152 This driver can also be built as a module. If so, the module
153 will be called rtc-ds1374.
155 config RTC_DRV_DS1672
156 tristate "Dallas/Maxim DS1672"
158 If you say yes here you get support for the
159 Dallas/Maxim DS1672 timekeeping chip.
161 This driver can also be built as a module. If so, the module
162 will be called rtc-ds1672.
164 config RTC_DRV_MAX6900
165 tristate "Maxim MAX6900"
167 If you say yes here you will get support for the
168 Maxim MAX6900 I2C RTC chip.
170 This driver can also be built as a module. If so, the module
171 will be called rtc-max6900.
173 config RTC_DRV_RS5C372
174 tristate "Ricoh RS5C372A/B, RV5C386, RV5C387A"
176 If you say yes here you get support for the
177 Ricoh RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
179 This driver can also be built as a module. If so, the module
180 will be called rtc-rs5c372.
182 config RTC_DRV_ISL1208
183 tristate "Intersil ISL1208"
185 If you say yes here you get support for the
186 Intersil ISL1208 RTC chip.
188 This driver can also be built as a module. If so, the module
189 will be called rtc-isl1208.
192 tristate "Xicor/Intersil X1205"
194 If you say yes here you get support for the
195 Xicor/Intersil X1205 RTC chip.
197 This driver can also be built as a module. If so, the module
198 will be called rtc-x1205.
200 config RTC_DRV_PCF8563
201 tristate "Philips PCF8563/Epson RTC8564"
203 If you say yes here you get support for the
204 Philips PCF8563 RTC chip. The Epson RTC8564
207 This driver can also be built as a module. If so, the module
208 will be called rtc-pcf8563.
210 config RTC_DRV_PCF8583
211 tristate "Philips PCF8583"
213 If you say yes here you get support for the Philips PCF8583
214 RTC chip found on Acorn RiscPCs. This driver supports the
215 platform specific method of retrieving the current year from
216 the RTC's SRAM. It will work on other platforms with the same
217 chip, but the year will probably have to be tweaked.
219 This driver can also be built as a module. If so, the module
220 will be called rtc-pcf8583.
222 config RTC_DRV_M41T80
223 tristate "ST M41T80/81/82/83/84/85/87"
225 If you say Y here you will get support for the
226 ST M41T80 RTC chips series. Currently following chips are
227 supported: M41T80, M41T81, M41T82, M41T83, M41ST84, M41ST85
230 This driver can also be built as a module. If so, the module
231 will be called rtc-m41t80.
233 config RTC_DRV_M41T80_WDT
234 bool "ST M41T80 series RTC watchdog timer"
235 depends on RTC_DRV_M41T80
237 If you say Y here you will get support for the
238 watchdog timer in ST M41T80 RTC chips series.
240 config RTC_DRV_TWL92330
241 boolean "TI TWL92330/Menelaus"
244 If you say yes here you get support for the RTC on the
245 TWL92330 "Menelaus" power management chip, used with OMAP2
246 platforms. The support is integrated with the rest of
247 the Menelaus driver; it's not separate module.
249 config RTC_DRV_S35390A
250 tristate "Seiko Instruments S-35390A"
253 If you say yes here you will get support for the Seiko
254 Instruments S-35390A.
256 This driver can also be built as a module. If so the module
257 will be called rtc-s35390a.
259 config RTC_DRV_FM3130
260 tristate "Ramtron FM3130"
262 If you say Y here you will get support for the
263 Ramtron FM3130 RTC chips.
264 Ramtron FM3130 is a chip with two separate devices inside,
265 RTC clock and FRAM. This driver provides only RTC functionality.
267 This driver can also be built as a module. If so the module
268 will be called rtc-fm3130.
272 comment "SPI RTC drivers"
276 config RTC_DRV_MAX6902
277 tristate "Maxim MAX6902"
279 If you say yes here you will get support for the
280 Maxim MAX6902 SPI RTC chip.
282 This driver can also be built as a module. If so, the module
283 will be called rtc-max6902.
286 tristate "Epson RTC-9701JE"
288 If you say yes here you will get support for the
289 Epson RTC-9701JE SPI RTC chip.
291 This driver can also be built as a module. If so, the module
292 will be called rtc-r9701.
294 config RTC_DRV_RS5C348
295 tristate "Ricoh RS5C348A/B"
297 If you say yes here you get support for the
298 Ricoh RS5C348A and RS5C348B RTC chips.
300 This driver can also be built as a module. If so, the module
301 will be called rtc-rs5c348.
305 comment "Platform RTC drivers"
307 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
308 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
309 # global rtc_lock ... it's not yet just another platform_device.
312 tristate "PC-style 'CMOS'"
313 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS
316 Say "yes" here to get direct support for the real time clock
317 found in every PC or ACPI-based system, and some other boards.
318 Specifically the original MC146818, compatibles like those in
319 PC south bridges, the DS12887 or M48T86, some multifunction
320 or LPC bus chips, and so on.
322 Your system will need to define the platform device used by
323 this driver, otherwise it won't be accessible. This means
324 you can safely enable this driver if you don't know whether
325 or not your board has this kind of hardware.
327 This driver can also be built as a module. If so, the module
328 will be called rtc-cmos.
330 config RTC_DRV_DS1216
331 tristate "Dallas DS1216"
334 If you say yes here you get support for the Dallas DS1216 RTC chips.
336 config RTC_DRV_DS1302
337 tristate "Dallas DS1302"
338 depends on SH_SECUREEDGE5410
340 If you say yes here you get support for the Dallas DS1302 RTC chips.
342 config RTC_DRV_DS1511
343 tristate "Dallas DS1511"
346 If you say yes here you get support for the
347 Dallas DS1511 timekeeping/watchdog chip.
349 This driver can also be built as a module. If so, the module
350 will be called rtc-ds1511.
352 config RTC_DRV_DS1553
353 tristate "Maxim/Dallas DS1553"
355 If you say yes here you get support for the
356 Maxim/Dallas DS1553 timekeeping chip.
358 This driver can also be built as a module. If so, the module
359 will be called rtc-ds1553.
361 config RTC_DRV_DS1742
362 tristate "Maxim/Dallas DS1742/1743"
364 If you say yes here you get support for the
365 Maxim/Dallas DS1742/1743 timekeeping chip.
367 This driver can also be built as a module. If so, the module
368 will be called rtc-ds1742.
370 config RTC_DRV_STK17TA8
371 tristate "Simtek STK17TA8"
374 If you say yes here you get support for the
375 Simtek STK17TA8 timekeeping chip.
377 This driver can also be built as a module. If so, the module
378 will be called rtc-stk17ta8.
380 config RTC_DRV_M48T86
381 tristate "ST M48T86/Dallas DS12887"
383 If you say Y here you will get support for the
384 ST M48T86 and Dallas DS12887 RTC chips.
386 This driver can also be built as a module. If so, the module
387 will be called rtc-m48t86.
389 config RTC_DRV_M48T59
392 If you say Y here you will get support for the
395 This driver can also be built as a module, if so, the module
396 will be called "rtc-m48t59".
399 tristate "EM Microelectronic V3020"
401 If you say yes here you will get support for the
402 EM Microelectronic v3020 RTC chip.
404 This driver can also be built as a module. If so, the module
405 will be called rtc-v3020.
407 comment "on-CPU RTC drivers"
411 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
413 Say "yes" here to support the real time clock on TI OMAP1 chips.
414 This driver can also be built as a module called rtc-omap.
417 tristate "Samsung S3C series SoC RTC"
418 depends on ARCH_S3C2410
420 RTC (Realtime Clock) driver for the clock inbuilt into the
421 Samsung S3C24XX series of SoCs. This can provide periodic
422 interrupt rates from 1Hz to 64Hz for user programs, and
425 The driver currently supports the common features on all the
426 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
429 This driver can also be build as a module. If so, the module
430 will be called rtc-s3c.
432 config RTC_DRV_EP93XX
433 tristate "Cirrus Logic EP93XX"
434 depends on ARCH_EP93XX
436 If you say yes here you get support for the
437 RTC embedded in the Cirrus Logic EP93XX processors.
439 This driver can also be built as a module. If so, the module
440 will be called rtc-ep93xx.
442 config RTC_DRV_SA1100
443 tristate "SA11x0/PXA2xx"
444 depends on ARCH_SA1100 || ARCH_PXA
446 If you say Y here you will get access to the real time clock
447 built into your SA11x0 or PXA2xx CPU.
449 To compile this driver as a module, choose M here: the
450 module will be called rtc-sa1100.
453 tristate "SuperH On-Chip RTC"
454 depends on RTC_CLASS && SUPERH
456 Say Y here to enable support for the on-chip RTC found in
457 most SuperH processors.
459 To compile this driver as a module, choose M here: the
460 module will be called rtc-sh.
462 config RTC_DRV_VR41XX
463 tristate "NEC VR41XX"
464 depends on CPU_VR41XX
466 If you say Y here you will get access to the real time clock
467 built into your NEC VR41XX CPU.
469 To compile this driver as a module, choose M here: the
470 module will be called rtc-vr41xx.
473 tristate "ARM AMBA PL031 RTC"
476 If you say Y here you will get access to ARM AMBA
477 PrimeCell PL031 RTC found on certain ARM SOCs.
479 To compile this driver as a module, choose M here: the
480 module will be called rtc-pl031.
482 config RTC_DRV_AT32AP700X
483 tristate "AT32AP700X series RTC"
484 depends on PLATFORM_AT32AP
486 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
487 AT32AP700x family processors.
489 config RTC_DRV_AT91RM9200
490 tristate "AT91RM9200 or AT91SAM9RL"
491 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
493 Driver for the internal RTC (Realtime Clock) module found on
494 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
495 this is powered by the backup power supply.
497 config RTC_DRV_AT91SAM9
499 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
501 RTC driver for the Atmel AT91SAM9x internal RTT (Real Time Timer).
502 These timers are powered by the backup power supply (such as a
503 small coin cell battery), but do not need to be used as RTCs.
505 (On AT91SAM9rl chips you probably want to use the dedicated RTC
506 module and leave the RTT available for other uses.)
508 config RTC_DRV_AT91SAM9_RTT
512 prompt "RTT module Number" if ARCH_AT91SAM9263
513 depends on RTC_DRV_AT91SAM9
515 More than one RTT module is available. You can choose which
516 one will be used as an RTC. The default of zero is normally
517 OK to use, though some systems use that for non-RTC purposes.
519 config RTC_DRV_AT91SAM9_GPBR
521 range 0 3 if !ARCH_AT91SAM9263
522 range 0 15 if ARCH_AT91SAM9263
524 prompt "Backup Register Number"
525 depends on RTC_DRV_AT91SAM9
527 The RTC driver needs to use one of the General Purpose Backup
528 Registers (GPBRs) as well as the RTT. You can choose which one
529 will be used. The default of zero is normally OK to use, but
530 on some systems other software needs to use that register.
533 tristate "Blackfin On-Chip RTC"
536 If you say yes here you will get support for the
537 Blackfin On-Chip Real Time Clock.
539 This driver can also be built as a module. If so, the module
540 will be called rtc-bfin.
542 config RTC_DRV_RS5C313
543 tristate "Ricoh RS5C313"
544 depends on SH_LANDISK
546 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
549 tristate "PowerPC machine dependent RTC support"
552 The PowerPC kernel has machine-specific functions for accessing
553 the RTC. This exposes that functionality through the generic RTC