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.
261 comment "SPI RTC drivers"
265 config RTC_DRV_MAX6902
266 tristate "Maxim MAX6902"
268 If you say yes here you will get support for the
269 Maxim MAX6902 SPI RTC chip.
271 This driver can also be built as a module. If so, the module
272 will be called rtc-max6902.
275 tristate "Epson RTC-9701JE"
277 If you say yes here you will get support for the
278 Epson RTC-9701JE SPI RTC chip.
280 This driver can also be built as a module. If so, the module
281 will be called rtc-r9701.
283 config RTC_DRV_RS5C348
284 tristate "Ricoh RS5C348A/B"
286 If you say yes here you get support for the
287 Ricoh RS5C348A and RS5C348B RTC chips.
289 This driver can also be built as a module. If so, the module
290 will be called rtc-rs5c348.
294 comment "Platform RTC drivers"
296 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
297 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
298 # global rtc_lock ... it's not yet just another platform_device.
301 tristate "PC-style 'CMOS'"
302 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS
305 Say "yes" here to get direct support for the real time clock
306 found in every PC or ACPI-based system, and some other boards.
307 Specifically the original MC146818, compatibles like those in
308 PC south bridges, the DS12887 or M48T86, some multifunction
309 or LPC bus chips, and so on.
311 Your system will need to define the platform device used by
312 this driver, otherwise it won't be accessible. This means
313 you can safely enable this driver if you don't know whether
314 or not your board has this kind of hardware.
316 This driver can also be built as a module. If so, the module
317 will be called rtc-cmos.
319 config RTC_DRV_DS1216
320 tristate "Dallas DS1216"
323 If you say yes here you get support for the Dallas DS1216 RTC chips.
325 config RTC_DRV_DS1302
326 tristate "Dallas DS1302"
327 depends on SH_SECUREEDGE5410
329 If you say yes here you get support for the Dallas DS1302 RTC chips.
331 config RTC_DRV_DS1511
332 tristate "Dallas DS1511"
335 If you say yes here you get support for the
336 Dallas DS1511 timekeeping/watchdog chip.
338 This driver can also be built as a module. If so, the module
339 will be called rtc-ds1511.
341 config RTC_DRV_DS1553
342 tristate "Maxim/Dallas DS1553"
344 If you say yes here you get support for the
345 Maxim/Dallas DS1553 timekeeping chip.
347 This driver can also be built as a module. If so, the module
348 will be called rtc-ds1553.
350 config RTC_DRV_DS1742
351 tristate "Maxim/Dallas DS1742/1743"
353 If you say yes here you get support for the
354 Maxim/Dallas DS1742/1743 timekeeping chip.
356 This driver can also be built as a module. If so, the module
357 will be called rtc-ds1742.
359 config RTC_DRV_STK17TA8
360 tristate "Simtek STK17TA8"
363 If you say yes here you get support for the
364 Simtek STK17TA8 timekeeping chip.
366 This driver can also be built as a module. If so, the module
367 will be called rtc-stk17ta8.
369 config RTC_DRV_M48T86
370 tristate "ST M48T86/Dallas DS12887"
372 If you say Y here you will get support for the
373 ST M48T86 and Dallas DS12887 RTC chips.
375 This driver can also be built as a module. If so, the module
376 will be called rtc-m48t86.
378 config RTC_DRV_M48T59
381 If you say Y here you will get support for the
384 This driver can also be built as a module, if so, the module
385 will be called "rtc-m48t59".
388 tristate "EM Microelectronic V3020"
390 If you say yes here you will get support for the
391 EM Microelectronic v3020 RTC chip.
393 This driver can also be built as a module. If so, the module
394 will be called rtc-v3020.
396 comment "on-CPU RTC drivers"
400 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
402 Say "yes" here to support the real time clock on TI OMAP1 chips.
403 This driver can also be built as a module called rtc-omap.
406 tristate "Samsung S3C series SoC RTC"
407 depends on ARCH_S3C2410
409 RTC (Realtime Clock) driver for the clock inbuilt into the
410 Samsung S3C24XX series of SoCs. This can provide periodic
411 interrupt rates from 1Hz to 64Hz for user programs, and
414 The driver currently supports the common features on all the
415 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
418 This driver can also be build as a module. If so, the module
419 will be called rtc-s3c.
421 config RTC_DRV_EP93XX
422 tristate "Cirrus Logic EP93XX"
423 depends on ARCH_EP93XX
425 If you say yes here you get support for the
426 RTC embedded in the Cirrus Logic EP93XX processors.
428 This driver can also be built as a module. If so, the module
429 will be called rtc-ep93xx.
431 config RTC_DRV_SA1100
432 tristate "SA11x0/PXA2xx"
433 depends on ARCH_SA1100 || ARCH_PXA
435 If you say Y here you will get access to the real time clock
436 built into your SA11x0 or PXA2xx CPU.
438 To compile this driver as a module, choose M here: the
439 module will be called rtc-sa1100.
442 tristate "SuperH On-Chip RTC"
443 depends on RTC_CLASS && SUPERH
445 Say Y here to enable support for the on-chip RTC found in
446 most SuperH processors.
448 To compile this driver as a module, choose M here: the
449 module will be called rtc-sh.
451 config RTC_DRV_VR41XX
452 tristate "NEC VR41XX"
453 depends on CPU_VR41XX
455 If you say Y here you will get access to the real time clock
456 built into your NEC VR41XX CPU.
458 To compile this driver as a module, choose M here: the
459 module will be called rtc-vr41xx.
462 tristate "ARM AMBA PL031 RTC"
465 If you say Y here you will get access to ARM AMBA
466 PrimeCell PL031 RTC found on certain ARM SOCs.
468 To compile this driver as a module, choose M here: the
469 module will be called rtc-pl031.
471 config RTC_DRV_AT32AP700X
472 tristate "AT32AP700X series RTC"
473 depends on PLATFORM_AT32AP
475 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
476 AT32AP700x family processors.
478 config RTC_DRV_AT91RM9200
479 tristate "AT91RM9200 or AT91SAM9RL"
480 depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
482 Driver for the internal RTC (Realtime Clock) module found on
483 Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
484 this is powered by the backup power supply.
486 config RTC_DRV_AT91SAM9
488 depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
490 RTC driver for the Atmel AT91SAM9x internal RTT (Real Time Timer).
491 These timers are powered by the backup power supply (such as a
492 small coin cell battery), but do not need to be used as RTCs.
494 (On AT91SAM9rl chips you probably want to use the dedicated RTC
495 module and leave the RTT available for other uses.)
497 config RTC_DRV_AT91SAM9_RTT
501 prompt "RTT module Number" if ARCH_AT91SAM9263
502 depends on RTC_DRV_AT91SAM9
504 More than one RTT module is available. You can choose which
505 one will be used as an RTC. The default of zero is normally
506 OK to use, though some systems use that for non-RTC purposes.
508 config RTC_DRV_AT91SAM9_GPBR
510 range 0 3 if !ARCH_AT91SAM9263
511 range 0 15 if ARCH_AT91SAM9263
513 prompt "Backup Register Number"
514 depends on RTC_DRV_AT91SAM9
516 The RTC driver needs to use one of the General Purpose Backup
517 Registers (GPBRs) as well as the RTT. You can choose which one
518 will be used. The default of zero is normally OK to use, but
519 on some systems other software needs to use that register.
522 tristate "Blackfin On-Chip RTC"
525 If you say yes here you will get support for the
526 Blackfin On-Chip Real Time Clock.
528 This driver can also be built as a module. If so, the module
529 will be called rtc-bfin.
531 config RTC_DRV_RS5C313
532 tristate "Ricoh RS5C313"
533 depends on SH_LANDISK
535 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
538 tristate "PowerPC machine dependent RTC support"
541 The PowerPC kernel has machine-specific functions for accessing
542 the RTC. This exposes that functionality through the generic RTC