Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#
2# RTC class/drivers configuration
3#
4
5config RTC_LIB
6 tristate
7
8menuconfig RTC_CLASS
9 tristate "Real Time Clock"
10 default n
11 depends on !S390
12 select RTC_LIB
13 help
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.
17
18 This driver can also be built as a module. If so, the module
19 will be called rtc-class.
20
21if RTC_CLASS
22
23config RTC_HCTOSYS
24 bool "Set system time from RTC on startup and resume"
25 depends on RTC_CLASS = y
26 default y
27 help
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.
31
32config RTC_HCTOSYS_DEVICE
33 string "RTC used to set the system time"
34 depends on RTC_HCTOSYS = y
35 default "rtc0"
36 help
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.
40
41 The driver for this RTC device must be loaded before late_initcall
42 functions run, so it must usually be statically linked.
43
44 This clock should be battery-backed, so that it reads the correct
45 time when the system boots from a power-off state. Otherwise, your
46 system will need an external clock source (like an NTP server).
47
48 If the clock you specify here is not battery backed, it may still
49 be useful to reinitialize system time when resuming from system
50 sleep states. Do not specify an RTC here unless it stays powered
51 during all this system's supported sleep states.
52
53config RTC_DEBUG
54 bool "RTC debug support"
55 depends on RTC_CLASS = y
56 help
57 Say yes here to enable debugging support in the RTC framework
58 and individual RTC drivers.
59
60comment "RTC interfaces"
61
62config RTC_INTF_SYSFS
63 boolean "/sys/class/rtc/rtcN (sysfs)"
64 depends on SYSFS
65 default RTC_CLASS
66 help
67 Say yes here if you want to use your RTCs using sysfs interfaces,
68 /sys/class/rtc/rtc0 through /sys/.../rtcN.
69
70 This driver can also be built as a module. If so, the module
71 will be called rtc-sysfs.
72
73config RTC_INTF_PROC
74 boolean "/proc/driver/rtc (procfs for rtc0)"
75 depends on PROC_FS
76 default RTC_CLASS
77 help
78 Say yes here if you want to use your first RTC through the proc
79 interface, /proc/driver/rtc. Other RTCs will not be available
80 through that API.
81
82 This driver can also be built as a module. If so, the module
83 will be called rtc-proc.
84
85config RTC_INTF_DEV
86 boolean "/dev/rtcN (character devices)"
87 default RTC_CLASS
88 help
89 Say yes here if you want to use your RTCs using the /dev
90 interfaces, which "udev" sets up as /dev/rtc0 through
91 /dev/rtcN. You may want to set up a symbolic link so one
92 of these can be accessed as /dev/rtc, which is a name
93 expected by "hwclock" and some other programs.
94
95 This driver can also be built as a module. If so, the module
96 will be called rtc-dev.
97
98config RTC_INTF_DEV_UIE_EMUL
99 bool "RTC UIE emulation on dev interface"
100 depends on RTC_INTF_DEV
101 help
102 Provides an emulation for RTC_UIE if the underlying rtc chip
103 driver does not expose RTC_UIE ioctls. Those requests generate
104 once-per-second update interrupts, used for synchronization.
105
106config RTC_DRV_TEST
107 tristate "Test driver/device"
108 help
109 If you say yes here you get support for the
110 RTC test driver. It's a software RTC which can be
111 used to test the RTC subsystem APIs. It gets
112 the time from the system clock.
113 You want this driver only if you are doing development
114 on the RTC subsystem. Please read the source code
115 for further details.
116
117 This driver can also be built as a module. If so, the module
118 will be called rtc-test.
119
120comment "I2C RTC drivers"
121 depends on I2C
122
123if I2C
124
125config RTC_DRV_DS1307
126 tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00"
127 help
128 If you say yes here you get support for various compatible RTC
129 chips (often with battery backup) connected with I2C. This driver
130 should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
131 and probably other chips. In some cases the RTC must already
132 have been initialized (by manufacturing or a bootloader).
133
134 The first seven registers on these chips hold an RTC, and other
135 registers may add features such as NVRAM, a trickle charger for
136 the RTC/NVRAM backup power, and alarms. This driver may not
137 expose all those available chip features.
138
139 This driver can also be built as a module. If so, the module
140 will be called rtc-ds1307.
141
142config RTC_DRV_DS1672
143 tristate "Dallas/Maxim DS1672"
144 help
145 If you say yes here you get support for the
146 Dallas/Maxim DS1672 timekeeping chip.
147
148 This driver can also be built as a module. If so, the module
149 will be called rtc-ds1672.
150
151config RTC_DRV_MAX6900
152 tristate "Maxim 6900"
153 help
154 If you say yes here you will get support for the
155 Maxim MAX6900 I2C RTC chip.
156
157 This driver can also be built as a module. If so, the module
158 will be called rtc-max6900.
159
160config RTC_DRV_RS5C372
161 tristate "Ricoh RS5C372A/B, RV5C386, RV5C387A"
162 help
163 If you say yes here you get support for the
164 Ricoh RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
165
166 This driver can also be built as a module. If so, the module
167 will be called rtc-rs5c372.
168
169config RTC_DRV_ISL1208
170 tristate "Intersil 1208"
171 help
172 If you say yes here you get support for the
173 Intersil 1208 RTC chip.
174
175 This driver can also be built as a module. If so, the module
176 will be called rtc-isl1208.
177
178config RTC_DRV_X1205
179 tristate "Xicor/Intersil X1205"
180 help
181 If you say yes here you get support for the
182 Xicor/Intersil X1205 RTC chip.
183
184 This driver can also be built as a module. If so, the module
185 will be called rtc-x1205.
186
187config RTC_DRV_PCF8563
188 tristate "Philips PCF8563/Epson RTC8564"
189 help
190 If you say yes here you get support for the
191 Philips PCF8563 RTC chip. The Epson RTC8564
192 should work as well.
193
194 This driver can also be built as a module. If so, the module
195 will be called rtc-pcf8563.
196
197config RTC_DRV_PCF8583
198 tristate "Philips PCF8583"
199 help
200 If you say yes here you get support for the Philips PCF8583
201 RTC chip found on Acorn RiscPCs. This driver supports the
202 platform specific method of retrieving the current year from
203 the RTC's SRAM. It will work on other platforms with the same
204 chip, but the year will probably have to be tweaked.
205
206 This driver can also be built as a module. If so, the module
207 will be called rtc-pcf8583.
208
209config RTC_DRV_M41T80
210 tristate "ST M41T80 series RTC"
211 help
212 If you say Y here you will get support for the
213 ST M41T80 RTC chips series. Currently following chips are
214 supported: M41T80, M41T81, M41T82, M41T83, M41ST84, M41ST85
215 and M41ST87.
216
217 This driver can also be built as a module. If so, the module
218 will be called rtc-m41t80.
219
220config RTC_DRV_M41T80_WDT
221 bool "ST M41T80 series RTC watchdog timer"
222 depends on RTC_DRV_M41T80
223 help
224 If you say Y here you will get support for the
225 watchdog timer in ST M41T80 RTC chips series.
226
227config RTC_DRV_TWL92330
228 boolean "TI TWL92330/Menelaus"
229 depends on MENELAUS
230 help
231 If you say yes here you get support for the RTC on the
232 TWL92330 "Menelaus" power mangement chip, used with OMAP2
233 platforms. The support is integrated with the rest of
234 the Menelaus driver; it's not separate module.
235
236endif # I2C
237
238comment "SPI RTC drivers"
239
240if SPI_MASTER
241
242config RTC_DRV_RS5C348
243 tristate "Ricoh RS5C348A/B"
244 help
245 If you say yes here you get support for the
246 Ricoh RS5C348A and RS5C348B RTC chips.
247
248 This driver can also be built as a module. If so, the module
249 will be called rtc-rs5c348.
250
251config RTC_DRV_MAX6902
252 tristate "Maxim 6902"
253 help
254 If you say yes here you will get support for the
255 Maxim MAX6902 SPI RTC chip.
256
257 This driver can also be built as a module. If so, the module
258 will be called rtc-max6902.
259
260endif # SPI_MASTER
261
262comment "Platform RTC drivers"
263
264# this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
265# requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
266# global rtc_lock ... it's not yet just another platform_device.
267
268config RTC_DRV_CMOS
269 tristate "PC-style 'CMOS'"
270 depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS
271 help
272 Say "yes" here to get direct support for the real time clock
273 found in every PC or ACPI-based system, and some other boards.
274 Specifically the original MC146818, compatibles like those in
275 PC south bridges, the DS12887 or M48T86, some multifunction
276 or LPC bus chips, and so on.
277
278 Your system will need to define the platform device used by
279 this driver, otherwise it won't be accessible. This means
280 you can safely enable this driver if you don't know whether
281 or not your board has this kind of hardware.
282
283 This driver can also be built as a module. If so, the module
284 will be called rtc-cmos.
285
286config RTC_DRV_DS1216
287 tristate "Dallas DS1216"
288 depends on SNI_RM
289 help
290 If you say yes here you get support for the Dallas DS1216 RTC chips.
291
292config RTC_DRV_DS1553
293 tristate "Dallas DS1553"
294 help
295 If you say yes here you get support for the
296 Dallas DS1553 timekeeping chip.
297
298 This driver can also be built as a module. If so, the module
299 will be called rtc-ds1553.
300
301config RTC_DRV_STK17TA8
302 tristate "Simtek STK17TA8"
303 depends on RTC_CLASS
304 help
305 If you say yes here you get support for the
306 Simtek STK17TA8 timekeeping chip.
307
308 This driver can also be built as a module. If so, the module
309 will be called rtc-stk17ta8.
310
311config RTC_DRV_DS1742
312 tristate "Dallas DS1742/1743"
313 help
314 If you say yes here you get support for the
315 Dallas DS1742/1743 timekeeping chip.
316
317 This driver can also be built as a module. If so, the module
318 will be called rtc-ds1742.
319
320config RTC_DRV_M48T86
321 tristate "ST M48T86/Dallas DS12887"
322 help
323 If you say Y here you will get support for the
324 ST M48T86 and Dallas DS12887 RTC chips.
325
326 This driver can also be built as a module. If so, the module
327 will be called rtc-m48t86.
328
329config RTC_DRV_M48T59
330 tristate "ST M48T59"
331 help
332 If you say Y here you will get support for the
333 ST M48T59 RTC chip.
334
335 This driver can also be built as a module, if so, the module
336 will be called "rtc-m48t59".
337
338config RTC_DRV_V3020
339 tristate "EM Microelectronic V3020"
340 help
341 If you say yes here you will get support for the
342 EM Microelectronic v3020 RTC chip.
343
344 This driver can also be built as a module. If so, the module
345 will be called rtc-v3020.
346
347comment "on-CPU RTC drivers"
348
349config RTC_DRV_OMAP
350 tristate "TI OMAP1"
351 depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
352 help
353 Say "yes" here to support the real time clock on TI OMAP1 chips.
354 This driver can also be built as a module called rtc-omap.
355
356config RTC_DRV_S3C
357 tristate "Samsung S3C series SoC RTC"
358 depends on ARCH_S3C2410
359 help
360 RTC (Realtime Clock) driver for the clock inbuilt into the
361 Samsung S3C24XX series of SoCs. This can provide periodic
362 interrupt rates from 1Hz to 64Hz for user programs, and
363 wakeup from Alarm.
364
365 The driver currently supports the common features on all the
366 S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
367 and S3C2442.
368
369 This driver can also be build as a module. If so, the module
370 will be called rtc-s3c.
371
372config RTC_DRV_EP93XX
373 tristate "Cirrus Logic EP93XX"
374 depends on ARCH_EP93XX
375 help
376 If you say yes here you get support for the
377 RTC embedded in the Cirrus Logic EP93XX processors.
378
379 This driver can also be built as a module. If so, the module
380 will be called rtc-ep93xx.
381
382config RTC_DRV_SA1100
383 tristate "SA11x0/PXA2xx"
384 depends on ARCH_SA1100 || ARCH_PXA
385 help
386 If you say Y here you will get access to the real time clock
387 built into your SA11x0 or PXA2xx CPU.
388
389 To compile this driver as a module, choose M here: the
390 module will be called rtc-sa1100.
391
392config RTC_DRV_SH
393 tristate "SuperH On-Chip RTC"
394 depends on RTC_CLASS && (CPU_SH3 || CPU_SH4)
395 help
396 Say Y here to enable support for the on-chip RTC found in
397 most SuperH processors.
398
399 To compile this driver as a module, choose M here: the
400 module will be called rtc-sh.
401
402config RTC_DRV_VR41XX
403 tristate "NEC VR41XX"
404 depends on CPU_VR41XX
405 help
406 If you say Y here you will get access to the real time clock
407 built into your NEC VR41XX CPU.
408
409 To compile this driver as a module, choose M here: the
410 module will be called rtc-vr41xx.
411
412config RTC_DRV_PL031
413 tristate "ARM AMBA PL031 RTC"
414 depends on ARM_AMBA
415 help
416 If you say Y here you will get access to ARM AMBA
417 PrimeCell PL031 RTC found on certain ARM SOCs.
418
419 To compile this driver as a module, choose M here: the
420 module will be called rtc-pl031.
421
422config RTC_DRV_AT32AP700X
423 tristate "AT32AP700X series RTC"
424 depends on PLATFORM_AT32AP
425 help
426 Driver for the internal RTC (Realtime Clock) on Atmel AVR32
427 AT32AP700x family processors.
428
429config RTC_DRV_AT91RM9200
430 tristate "AT91RM9200"
431 depends on ARCH_AT91RM9200
432 help
433 Driver for the Atmel AT91RM9200's internal RTC (Realtime Clock).
434
435config RTC_DRV_BFIN
436 tristate "Blackfin On-Chip RTC"
437 depends on BFIN
438 help
439 If you say yes here you will get support for the
440 Blackfin On-Chip Real Time Clock.
441
442 This driver can also be built as a module. If so, the module
443 will be called rtc-bfin.
444
445config RTC_DRV_RS5C313
446 tristate "Ricoh RS5C313"
447 depends on SH_LANDISK
448 help
449 If you say yes here you get support for the Ricoh RS5C313 RTC chips.
450
451endif # RTC_CLASS