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-class.
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 "Maxim/Dallas Semiconductor DS1374 Real Time Clock"
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 6900"
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 1208"
185 If you say yes here you get support for the
186 Intersil 1208 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 series RTC"
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.
251 comment "SPI RTC drivers"
255 config RTC_DRV_RS5C348
256 tristate "Ricoh RS5C348A/B"
258 If you say yes here you get support for the
259 Ricoh RS5C348A and RS5C348B RTC chips.
261 This driver can also be built as a module. If so, the module
262 will be called rtc-rs5c348.
264 config RTC_DRV_MAX6902
265 tristate "Maxim 6902"
267 If you say yes here you will get support for the
268 Maxim MAX6902 SPI RTC chip.
270 This driver can also be built as a module. If so, the module
271 will be called rtc-max6902.
275 comment "Platform RTC drivers"
277 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
278 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
279 # global rtc_lock ... it's not yet just another platform_device.
282 tristate "PC-style 'CMOS'"
283 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS
285 Say "yes" here to get direct support for the real time clock
286 found in every PC or ACPI-based system, and some other boards.
287 Specifically the original MC146818, compatibles like those in
288 PC south bridges, the DS12887 or M48T86, some multifunction
289 or LPC bus chips, and so on.
291 Your system will need to define the platform device used by
292 this driver, otherwise it won't be accessible. This means
293 you can safely enable this driver if you don't know whether
294 or not your board has this kind of hardware.
296 This driver can also be built as a module. If so, the module
297 will be called rtc-cmos.
299 config RTC_DRV_DS1216
300 tristate "Dallas DS1216"
303 If you say yes here you get support for the Dallas DS1216 RTC chips.
305 config RTC_DRV_DS1553
306 tristate "Dallas DS1553"
308 If you say yes here you get support for the
309 Dallas DS1553 timekeeping chip.
311 This driver can also be built as a module. If so, the module
312 will be called rtc-ds1553.
314 config RTC_DRV_STK17TA8
315 tristate "Simtek STK17TA8"
318 If you say yes here you get support for the
319 Simtek STK17TA8 timekeeping chip.
321 This driver can also be built as a module. If so, the module
322 will be called rtc-stk17ta8.
324 config RTC_DRV_DS1742
325 tristate "Dallas DS1742/1743"
327 If you say yes here you get support for the
328 Dallas DS1742/1743 timekeeping chip.
330 This driver can also be built as a module. If so, the module
331 will be called rtc-ds1742.
333 config RTC_DRV_M48T86
334 tristate "ST M48T86/Dallas DS12887"
336 If you say Y here you will get support for the
337 ST M48T86 and Dallas DS12887 RTC chips.
339 This driver can also be built as a module. If so, the module
340 will be called rtc-m48t86.
342 config RTC_DRV_M48T59
345 If you say Y here you will get support for the
348 This driver can also be built as a module, if so, the module
349 will be called "rtc-m48t59".
352 tristate "EM Microelectronic V3020"
354 If you say yes here you will get support for the
355 EM Microelectronic v3020 RTC chip.
357 This driver can also be built as a module. If so, the module
358 will be called rtc-v3020.
360 comment "on-CPU RTC drivers"
364 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
366 Say "yes" here to support the real time clock on TI OMAP1 chips.
367 This driver can also be built as a module called rtc-omap.
370 tristate "Samsung S3C series SoC RTC"
371 depends on ARCH_S3C2410
373 RTC (Realtime Clock) driver for the clock inbuilt into the
374 Samsung S3C24XX series of SoCs. This can provide periodic
375 interrupt rates from 1Hz to 64Hz for user programs, and
378 The driver currently supports the common features on all the
379 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
382 This driver can also be build as a module. If so, the module
383 will be called rtc-s3c.
385 config RTC_DRV_EP93XX
386 tristate "Cirrus Logic EP93XX"
387 depends on ARCH_EP93XX
389 If you say yes here you get support for the
390 RTC embedded in the Cirrus Logic EP93XX processors.
392 This driver can also be built as a module. If so, the module
393 will be called rtc-ep93xx.
395 config RTC_DRV_SA1100
396 tristate "SA11x0/PXA2xx"
397 depends on ARCH_SA1100 || ARCH_PXA
399 If you say Y here you will get access to the real time clock
400 built into your SA11x0 or PXA2xx CPU.
402 To compile this driver as a module, choose M here: the
403 module will be called rtc-sa1100.
406 tristate "SuperH On-Chip RTC"
407 depends on RTC_CLASS && SUPERH
409 Say Y here to enable support for the on-chip RTC found in
410 most SuperH processors.
412 To compile this driver as a module, choose M here: the
413 module will be called rtc-sh.
415 config RTC_DRV_VR41XX
416 tristate "NEC VR41XX"
417 depends on CPU_VR41XX
419 If you say Y here you will get access to the real time clock
420 built into your NEC VR41XX CPU.
422 To compile this driver as a module, choose M here: the
423 module will be called rtc-vr41xx.
426 tristate "ARM AMBA PL031 RTC"
429 If you say Y here you will get access to ARM AMBA
430 PrimeCell PL031 RTC found on certain ARM SOCs.
432 To compile this driver as a module, choose M here: the
433 module will be called rtc-pl031.
435 config RTC_DRV_AT32AP700X
436 tristate "AT32AP700X series RTC"
437 depends on PLATFORM_AT32AP
439 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
440 AT32AP700x family processors.
442 config RTC_DRV_AT91RM9200
443 tristate "AT91RM9200"
444 depends on ARCH_AT91RM9200
446 Driver for the Atmel AT91RM9200's internal RTC (Realtime Clock).
449 tristate "Blackfin On-Chip RTC"
452 If you say yes here you will get support for the
453 Blackfin On-Chip Real Time Clock.
455 This driver can also be built as a module. If so, the module
456 will be called rtc-bfin.
458 config RTC_DRV_RS5C313
459 tristate "Ricoh RS5C313"
460 depends on SH_LANDISK
462 If you say yes here you get support for the Ricoh RS5C313 RTC chips.