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 452