drivers/rtc/Kconfig

   1 #
   2 # RTC class/drivers configuration
   3 #
   4
   5 config RTC_LIB
   6         tristate
   7
   8 menuconfig 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-core.
  20
  21 if RTC_CLASS
  22
  23 config 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
  32 config 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. This
  40           device should record time in UTC, since the kernel won't do
  41           timezone correction.
  42
  43           The driver for this RTC device must be loaded before late_initcall
  44           functions run, so it must usually be statically linked.
  45
  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).
  49
  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.
  54
  55 config RTC_DEBUG
  56         bool "RTC debug support"
  57         depends on RTC_CLASS = y
  58         help
  59           Say yes here to enable debugging support in the RTC framework
  60           and individual RTC drivers.
  61
  62 comment "RTC interfaces"
  63
  64 config RTC_INTF_SYSFS
  65         boolean "/sys/class/rtc/rtcN (sysfs)"
  66         depends on SYSFS
  67         default RTC_CLASS
  68         help
  69           Say yes here if you want to use your RTCs using sysfs interfaces,
  70           /sys/class/rtc/rtc0 through /sys/.../rtcN.
  71
  72           If unsure, say Y.
  73
  74 config RTC_INTF_PROC
  75         boolean "/proc/driver/rtc (procfs for rtc0)"
  76         depends on PROC_FS
  77         default RTC_CLASS
  78         help
  79           Say yes here if you want to use your first RTC through the proc
  80           interface, /proc/driver/rtc. Other RTCs will not be available
  81           through that API.
  82
  83           If unsure, say Y.
  84
  85 config 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.
  92
  93           You may want to set up a symbolic link so one of these
  94           can be accessed as /dev/rtc, which is a name
  95           expected by "hwclock" and some other programs. Recent
  96           versions of "udev" are known to set up the symlink for you.
  97
  98           If unsure, say Y.
  99
 100 config RTC_INTF_DEV_UIE_EMUL
 101         bool "RTC UIE emulation on dev interface"
 102         depends on RTC_INTF_DEV
 103         help
 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.
 107
 108           The emulation code will read the time from the hardware
 109           clock several times per second, please enable this option
 110           only if you know that you really need it.
 111
 112 config RTC_DRV_TEST
 113         tristate "Test driver/device"
 114         help
 115           If you say yes here you get support for the
 116           RTC test driver. It's a software RTC which can be
 117           used to test the RTC subsystem APIs. It gets
 118           the time from the system clock.
 119           You want this driver only if you are doing development
 120           on the RTC subsystem. Please read the source code
 121           for further details.
 122
 123           This driver can also be built as a module. If so, the module
 124           will be called rtc-test.
 125
 126 comment "I2C RTC drivers"
 127         depends on I2C
 128
 129 if I2C
 130
 131 config RTC_DRV_DS1307
 132         tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
 133         help
 134           If you say yes here you get support for various compatible RTC
 135           chips (often with battery backup) connected with I2C. This driver
 136           should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
 137           EPSON RX-8025 and probably other chips. In some cases the RTC
 138           must already have been initialized (by manufacturing or a
 139           bootloader).
 140
 141           The first seven registers on these chips hold an RTC, and other
 142           registers may add features such as NVRAM, a trickle charger for
 143           the RTC/NVRAM backup power, and alarms. NVRAM is visible in
 144           sysfs, but other chip features may not be available.
 145
 146           This driver can also be built as a module. If so, the module
 147           will be called rtc-ds1307.
 148
 149 config RTC_DRV_DS1374
 150         tristate "Dallas/Maxim DS1374"
 151         depends on RTC_CLASS && I2C
 152         help
 153           If you say yes here you get support for Dallas Semiconductor
 154           DS1374 real-time clock chips. If an interrupt is associated
 155           with the device, the alarm functionality is supported.
 156
 157           This driver can also be built as a module. If so, the module
 158           will be called rtc-ds1374.
 159
 160 config RTC_DRV_DS1672
 161         tristate "Dallas/Maxim DS1672"
 162         help
 163           If you say yes here you get support for the
 164           Dallas/Maxim DS1672 timekeeping chip.
 165
 166           This driver can also be built as a module. If so, the module
 167           will be called rtc-ds1672.
 168
 169 config RTC_DRV_MAX6900
 170         tristate "Maxim MAX6900"
 171         help
 172           If you say yes here you will get support for the
 173           Maxim MAX6900 I2C RTC chip.
 174
 175           This driver can also be built as a module. If so, the module
 176           will be called rtc-max6900.
 177
 178 config RTC_DRV_RS5C372
 179         tristate "Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A"
 180         help
 181           If you say yes here you get support for the
 182           Ricoh R2025S/D, RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
 183
 184           This driver can also be built as a module. If so, the module
 185           will be called rtc-rs5c372.
 186
 187 config RTC_DRV_ISL1208
 188         tristate "Intersil ISL1208"
 189         help
 190           If you say yes here you get support for the
 191           Intersil ISL1208 RTC chip.
 192
 193           This driver can also be built as a module. If so, the module
 194           will be called rtc-isl1208.
 195
 196 config RTC_DRV_X1205
 197         tristate "Xicor/Intersil X1205"
 198         help
 199           If you say yes here you get support for the
 200           Xicor/Intersil X1205 RTC chip.
 201
 202           This driver can also be built as a module. If so, the module
 203           will be called rtc-x1205.
 204
 205 config RTC_DRV_PCF8563
 206         tristate "Philips PCF8563/Epson RTC8564"
 207         help
 208           If you say yes here you get support for the
 209           Philips PCF8563 RTC chip. The Epson RTC8564
 210           should work as well.
 211
 212           This driver can also be built as a module. If so, the module
 213           will be called rtc-pcf8563.
 214
 215 config RTC_DRV_PCF8583
 216         tristate "Philips PCF8583"
 217         help
 218           If you say yes here you get support for the Philips PCF8583
 219           RTC chip found on Acorn RiscPCs. This driver supports the
 220           platform specific method of retrieving the current year from
 221           the RTC's SRAM. It will work on other platforms with the same
 222           chip, but the year will probably have to be tweaked.
 223
 224           This driver can also be built as a module. If so, the module
 225           will be called rtc-pcf8583.
 226
 227 config RTC_DRV_M41T80
 228         tristate "ST M41T62/65/M41T80/81/82/83/84/85/87"
 229         help
 230           If you say Y here you will get support for the ST M41T60
 231           and M41T80 RTC chips series. Currently, the following chips are
 232           supported: M41T62, M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
 233           M41ST85, and M41ST87.
 234
 235           This driver can also be built as a module. If so, the module
 236           will be called rtc-m41t80.
 237
 238 config RTC_DRV_M41T80_WDT
 239         bool "ST M41T65/M41T80 series RTC watchdog timer"
 240         depends on RTC_DRV_M41T80
 241         help
 242           If you say Y here you will get support for the
 243           watchdog timer in the ST M41T60 and M41T80 RTC chips series.
 244
 245 config RTC_DRV_DM355EVM
 246         tristate "TI DaVinci DM355 EVM RTC"
 247         depends on MFD_DM355EVM_MSP
 248         help
 249           Supports the RTC firmware in the MSP430 on the DM355 EVM.
 250
 251 config RTC_DRV_TWL92330
 252         boolean "TI TWL92330/Menelaus"
 253         depends on MENELAUS
 254         help
 255           If you say yes here you get support for the RTC on the
 256           TWL92330 "Menelaus" power management chip, used with OMAP2
 257           platforms. The support is integrated with the rest of
 258           the Menelaus driver; it's not separate module.
 259
 260 config RTC_DRV_TWL4030
 261         tristate "TI TWL4030/TWL5030/TPS659x0"
 262         depends on RTC_CLASS && TWL4030_CORE
 263         help
 264           If you say yes here you get support for the RTC on the
 265           TWL4030 family chips, used mostly with OMAP3 platforms.
 266
 267           This driver can also be built as a module. If so, the module
 268           will be called rtc-twl4030.
 269
 270 config RTC_DRV_S35390A
 271         tristate "Seiko Instruments S-35390A"
 272         select BITREVERSE
 273         help
 274           If you say yes here you will get support for the Seiko
 275           Instruments S-35390A.
 276
 277           This driver can also be built as a module. If so the module
 278           will be called rtc-s35390a.
 279
 280 config RTC_DRV_FM3130
 281         tristate "Ramtron FM3130"
 282         help
 283           If you say Y here you will get support for the
 284           Ramtron FM3130 RTC chips.
 285           Ramtron FM3130 is a chip with two separate devices inside,
 286           RTC clock and FRAM. This driver provides only RTC functionality.
 287
 288           This driver can also be built as a module. If so the module
 289           will be called rtc-fm3130.
 290
 291 config RTC_DRV_RX8581
 292         tristate "Epson RX-8581"
 293         help
 294           If you say yes here you will get support for the Epson RX-8581.
 295
 296           This driver can also be built as a module. If so the module
 297           will be called rtc-rx8581.
 298
 299 config RTC_DRV_RX8025
 300         tristate "Epson RX-8025SA/NB"
 301         help
 302           If you say yes here you get support for the Epson
 303           RX-8025SA/NB RTC chips.
 304
 305           This driver can also be built as a module. If so, the module
 306           will be called rtc-rx8025.
 307
 308 endif # I2C
 309
 310 comment "SPI RTC drivers"
 311
 312 if SPI_MASTER
 313
 314 config RTC_DRV_M41T94
 315         tristate "ST M41T94"
 316         help
 317           If you say yes here you will get support for the
 318           ST M41T94 SPI RTC chip.
 319
 320           This driver can also be built as a module. If so, the module
 321           will be called rtc-m41t94.
 322
 323 config RTC_DRV_DS1305
 324         tristate "Dallas/Maxim DS1305/DS1306"
 325         help
 326           Select this driver to get support for the Dallas/Maxim DS1305
 327           and DS1306 real time clock chips. These support a trickle
 328           charger, alarms, and NVRAM in addition to the clock.
 329
 330           This driver can also be built as a module. If so, the module
 331           will be called rtc-ds1305.
 332
 333 config RTC_DRV_DS1390
 334         tristate "Dallas/Maxim DS1390/93/94"
 335         help
 336           If you say yes here you get support for the
 337           Dallas/Maxim DS1390/93/94 chips.
 338
 339           This driver only supports the RTC feature, and not other chip
 340           features such as alarms and trickle charging.
 341
 342           This driver can also be built as a module. If so, the module
 343           will be called rtc-ds1390.
 344
 345 config RTC_DRV_MAX6902
 346         tristate "Maxim MAX6902"
 347         help
 348           If you say yes here you will get support for the
 349           Maxim MAX6902 SPI RTC chip.
 350
 351           This driver can also be built as a module. If so, the module
 352           will be called rtc-max6902.
 353
 354 config RTC_DRV_R9701
 355         tristate "Epson RTC-9701JE"
 356         help
 357           If you say yes here you will get support for the
 358           Epson RTC-9701JE SPI RTC chip.
 359
 360           This driver can also be built as a module. If so, the module
 361           will be called rtc-r9701.
 362
 363 config RTC_DRV_RS5C348
 364         tristate "Ricoh RS5C348A/B"
 365         help
 366           If you say yes here you get support for the
 367           Ricoh RS5C348A and RS5C348B RTC chips.
 368
 369           This driver can also be built as a module. If so, the module
 370           will be called rtc-rs5c348.
 371
 372 config RTC_DRV_DS3234
 373         tristate "Maxim/Dallas DS3234"
 374         help
 375           If you say yes here you get support for the
 376           Maxim/Dallas DS3234 SPI RTC chip.
 377
 378           This driver can also be built as a module. If so, the module
 379           will be called rtc-ds3234.
 380
 381 config RTC_DRV_PCF2123
 382         tristate "NXP PCF2123"
 383         help
 384           If you say yes here you get support for the NXP PCF2123
 385           RTC chip.
 386
 387           This driver can also be built as a module. If so, the module
 388           will be called rtc-pcf2123.
 389
 390 endif # SPI_MASTER
 391
 392 comment "Platform RTC drivers"
 393
 394 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
 395 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
 396 # global rtc_lock ... it's not yet just another platform_device.
 397
 398 config RTC_DRV_CMOS
 399         tristate "PC-style 'CMOS'"
 400         depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC64
 401         default y if X86
 402         help
 403           Say "yes" here to get direct support for the real time clock
 404           found in every PC or ACPI-based system, and some other boards.
 405           Specifically the original MC146818, compatibles like those in
 406           PC south bridges, the DS12887 or M48T86, some multifunction
 407           or LPC bus chips, and so on.
 408
 409           Your system will need to define the platform device used by
 410           this driver, otherwise it won't be accessible. This means
 411           you can safely enable this driver if you don't know whether
 412           or not your board has this kind of hardware.
 413
 414           This driver can also be built as a module. If so, the module
 415           will be called rtc-cmos.
 416
 417 config RTC_DRV_DS1216
 418         tristate "Dallas DS1216"
 419         depends on SNI_RM
 420         help
 421           If you say yes here you get support for the Dallas DS1216 RTC chips.
 422
 423 config RTC_DRV_DS1286
 424         tristate "Dallas DS1286"
 425         help
 426           If you say yes here you get support for the Dallas DS1286 RTC chips.
 427
 428 config RTC_DRV_DS1302
 429         tristate "Dallas DS1302"
 430         depends on SH_SECUREEDGE5410
 431         help
 432           If you say yes here you get support for the Dallas DS1302 RTC chips.
 433
 434 config RTC_DRV_DS1511
 435         tristate "Dallas DS1511"
 436         depends on RTC_CLASS
 437         help
 438           If you say yes here you get support for the
 439           Dallas DS1511 timekeeping/watchdog chip.
 440
 441           This driver can also be built as a module. If so, the module
 442           will be called rtc-ds1511.
 443
 444 config RTC_DRV_DS1553
 445         tristate "Maxim/Dallas DS1553"
 446         help
 447           If you say yes here you get support for the
 448           Maxim/Dallas DS1553 timekeeping chip.
 449
 450           This driver can also be built as a module. If so, the module
 451           will be called rtc-ds1553.
 452
 453 config RTC_DRV_DS1742
 454         tristate "Maxim/Dallas DS1742/1743"
 455         help
 456           If you say yes here you get support for the
 457           Maxim/Dallas DS1742/1743 timekeeping chip.
 458
 459           This driver can also be built as a module. If so, the module
 460           will be called rtc-ds1742.
 461
 462 config RTC_DRV_EFI
 463         tristate "EFI RTC"
 464         depends on IA64
 465         help
 466           If you say yes here you will get support for the EFI
 467           Real Time Clock.
 468
 469           This driver can also be built as a module. If so, the module
 470           will be called rtc-efi.
 471
 472 config RTC_DRV_STK17TA8
 473         tristate "Simtek STK17TA8"
 474         depends on RTC_CLASS
 475         help
 476           If you say yes here you get support for the
 477           Simtek STK17TA8 timekeeping chip.
 478
 479           This driver can also be built as a module. If so, the module
 480           will be called rtc-stk17ta8.
 481
 482 config RTC_DRV_M48T86
 483         tristate "ST M48T86/Dallas DS12887"
 484         help
 485           If you say Y here you will get support for the
 486           ST M48T86 and Dallas DS12887 RTC chips.
 487
 488           This driver can also be built as a module. If so, the module
 489           will be called rtc-m48t86.
 490
 491 config RTC_DRV_M48T35
 492         tristate "ST M48T35"
 493         help
 494           If you say Y here you will get support for the
 495           ST M48T35 RTC chip.
 496
 497           This driver can also be built as a module, if so, the module
 498           will be called "rtc-m48t35".
 499
 500 config RTC_DRV_M48T59
 501         tristate "ST M48T59/M48T08/M48T02"
 502         help
 503           If you say Y here you will get support for the
 504           ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
 505
 506           These chips are usually found in Sun SPARC and UltraSPARC
 507           workstations.
 508
 509           This driver can also be built as a module, if so, the module
 510           will be called "rtc-m48t59".
 511
 512 config RTC_MXC
 513         tristate "Freescale MXC Real Time Clock"
 514         depends on ARCH_MXC
 515         depends on RTC_CLASS
 516         help
 517            If you say yes here you get support for the Freescale MXC
 518            RTC module.
 519
 520            This driver can also be built as a module, if so, the module
 521            will be called "rtc-mxc".
 522
 523 config RTC_DRV_BQ4802
 524         tristate "TI BQ4802"
 525         help
 526           If you say Y here you will get support for the TI
 527           BQ4802 RTC chip.
 528
 529           This driver can also be built as a module. If so, the module
 530           will be called rtc-bq4802.
 531
 532 config RTC_DRV_V3020
 533         tristate "EM Microelectronic V3020"
 534         help
 535           If you say yes here you will get support for the
 536           EM Microelectronic v3020 RTC chip.
 537
 538           This driver can also be built as a module. If so, the module
 539           will be called rtc-v3020.
 540
 541 config RTC_DRV_WM831X
 542         tristate "Wolfson Microelectronics WM831x RTC"
 543         depends on MFD_WM831X
 544         help
 545           If you say yes here you will get support for the RTC subsystem
 546           of the Wolfson Microelectronics WM831X series PMICs.
 547
 548           This driver can also be built as a module. If so, the module
 549           will be called "rtc-wm831x".
 550
 551 config RTC_DRV_WM8350
 552         tristate "Wolfson Microelectronics WM8350 RTC"
 553         depends on MFD_WM8350
 554         help
 555           If you say yes here you will get support for the RTC subsystem
 556           of the Wolfson Microelectronics WM8350.
 557
 558           This driver can also be built as a module. If so, the module
 559           will be called "rtc-wm8350".
 560
 561 config RTC_DRV_PCF50633
 562         depends on MFD_PCF50633
 563         tristate "NXP PCF50633 RTC"
 564         help
 565           If you say yes here you get support for the RTC subsystem of the
 566           NXP PCF50633 used in embedded systems.
 567
 568 config RTC_DRV_AB3100
 569         tristate "ST-Ericsson AB3100 RTC"
 570         depends on AB3100_CORE
 571         default y if AB3100_CORE
 572         help
 573           Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC
 574           support. This chip contains a battery- and capacitor-backed RTC.
 575
 576
 577 comment "on-CPU RTC drivers"
 578
 579 config RTC_DRV_OMAP
 580         tristate "TI OMAP1"
 581         depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
 582         help
 583           Say "yes" here to support the real time clock on TI OMAP1 chips.
 584           This driver can also be built as a module called rtc-omap.
 585
 586 config RTC_DRV_S3C
 587         tristate "Samsung S3C series SoC RTC"
 588         depends on ARCH_S3C2410
 589         help
 590           RTC (Realtime Clock) driver for the clock inbuilt into the
 591           Samsung S3C24XX series of SoCs. This can provide periodic
 592           interrupt rates from 1Hz to 64Hz for user programs, and
 593           wakeup from Alarm.
 594
 595           The driver currently supports the common features on all the
 596           S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
 597           and S3C2442.
 598
 599           This driver can also be build as a module. If so, the module
 600           will be called rtc-s3c.
 601
 602 config RTC_DRV_EP93XX
 603         tristate "Cirrus Logic EP93XX"
 604         depends on ARCH_EP93XX
 605         help
 606           If you say yes here you get support for the
 607           RTC embedded in the Cirrus Logic EP93XX processors.
 608
 609           This driver can also be built as a module. If so, the module
 610           will be called rtc-ep93xx.
 611
 612 config RTC_DRV_SA1100
 613         tristate "SA11x0/PXA2xx"
 614         depends on ARCH_SA1100 || ARCH_PXA
 615         help
 616           If you say Y here you will get access to the real time clock
 617           built into your SA11x0 or PXA2xx CPU.
 618
 619           To compile this driver as a module, choose M here: the
 620           module will be called rtc-sa1100.
 621
 622 config RTC_DRV_SH
 623         tristate "SuperH On-Chip RTC"
 624         depends on RTC_CLASS && SUPERH && HAVE_CLK
 625         help
 626           Say Y here to enable support for the on-chip RTC found in
 627           most SuperH processors.
 628
 629           To compile this driver as a module, choose M here: the
 630           module will be called rtc-sh.
 631
 632 config RTC_DRV_VR41XX
 633         tristate "NEC VR41XX"
 634         depends on CPU_VR41XX
 635         help
 636           If you say Y here you will get access to the real time clock
 637           built into your NEC VR41XX CPU.
 638
 639           To compile this driver as a module, choose M here: the
 640           module will be called rtc-vr41xx.
 641
 642 config RTC_DRV_PL030
 643         tristate "ARM AMBA PL030 RTC"
 644         depends on ARM_AMBA
 645         help
 646           If you say Y here you will get access to ARM AMBA
 647           PrimeCell PL030 RTC found on certain ARM SOCs.
 648
 649           To compile this driver as a module, choose M here: the
 650           module will be called rtc-pl030.
 651
 652 config RTC_DRV_PL031
 653         tristate "ARM AMBA PL031 RTC"
 654         depends on ARM_AMBA
 655         help
 656           If you say Y here you will get access to ARM AMBA
 657           PrimeCell PL031 RTC found on certain ARM SOCs.
 658
 659           To compile this driver as a module, choose M here: the
 660           module will be called rtc-pl031.
 661
 662 config RTC_DRV_AT32AP700X
 663         tristate "AT32AP700X series RTC"
 664         depends on PLATFORM_AT32AP
 665         help
 666           Driver for the internal RTC (Realtime Clock) on Atmel AVR32
 667           AT32AP700x family processors.
 668
 669 config RTC_DRV_AT91RM9200
 670         tristate "AT91RM9200 or AT91SAM9RL"
 671         depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
 672         help
 673           Driver for the internal RTC (Realtime Clock) module found on
 674           Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
 675           this is powered by the backup power supply.
 676
 677 config RTC_DRV_AT91SAM9
 678         tristate "AT91SAM9x/AT91CAP9"
 679         depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
 680         help
 681           RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
 682           (Real Time Timer). These timers are powered by the backup power
 683           supply (such as a small coin cell battery), but do not need to
 684           be used as RTCs.
 685
 686           (On AT91SAM9rl chips you probably want to use the dedicated RTC
 687           module and leave the RTT available for other uses.)
 688
 689 config RTC_DRV_AT91SAM9_RTT
 690         int
 691         range 0 1
 692         default 0
 693         prompt "RTT module Number" if ARCH_AT91SAM9263
 694         depends on RTC_DRV_AT91SAM9
 695         help
 696           More than one RTT module is available. You can choose which
 697           one will be used as an RTC. The default of zero is normally
 698           OK to use, though some systems use that for non-RTC purposes.
 699
 700 config RTC_DRV_AT91SAM9_GPBR
 701         int
 702         range 0 3 if !ARCH_AT91SAM9263
 703         range 0 15 if ARCH_AT91SAM9263
 704         default 0
 705         prompt "Backup Register Number"
 706         depends on RTC_DRV_AT91SAM9
 707         help
 708           The RTC driver needs to use one of the General Purpose Backup
 709           Registers (GPBRs) as well as the RTT. You can choose which one
 710           will be used. The default of zero is normally OK to use, but
 711           on some systems other software needs to use that register.
 712
 713 config RTC_DRV_AU1XXX
 714         tristate "Au1xxx Counter0 RTC support"
 715         depends on SOC_AU1X00
 716         help
 717           This is a driver for the Au1xxx on-chip Counter0 (Time-Of-Year
 718           counter) to be used as a RTC.
 719
 720           This driver can also be built as a module. If so, the module
 721           will be called rtc-au1xxx.
 722
 723 config RTC_DRV_BFIN
 724         tristate "Blackfin On-Chip RTC"
 725         depends on BLACKFIN && !BF561
 726         help
 727           If you say yes here you will get support for the
 728           Blackfin On-Chip Real Time Clock.
 729
 730           This driver can also be built as a module. If so, the module
 731           will be called rtc-bfin.
 732
 733 config RTC_DRV_RS5C313
 734         tristate "Ricoh RS5C313"
 735         depends on SH_LANDISK
 736         help
 737           If you say yes here you get support for the Ricoh RS5C313 RTC chips.
 738
 739 config RTC_DRV_GENERIC
 740         tristate "Generic RTC support"
 741         # Please consider writing a new RTC driver instead of using the generic
 742         # RTC abstraction
 743         depends on PARISC || M68K || PPC || SUPERH32
 744         help
 745           Say Y or M here to enable RTC support on systems using the generic
 746           RTC abstraction. If you do not know what you are doing, you should
 747           just say Y.
 748
 749 config RTC_DRV_PXA
 750        tristate "PXA27x/PXA3xx"
 751        depends on ARCH_PXA
 752        help
 753          If you say Y here you will get access to the real time clock
 754          built into your PXA27x or PXA3xx CPU.
 755
 756          This RTC driver uses PXA RTC registers available since pxa27x
 757          series (RDxR, RYxR) instead of legacy RCNR, RTAR.
 758
 759
 760 config RTC_DRV_SUN4V
 761         bool "SUN4V Hypervisor RTC"
 762         depends on SPARC64
 763         help
 764           If you say Y here you will get support for the Hypervisor
 765           based RTC on SUN4V systems.
 766
 767 config RTC_DRV_STARFIRE
 768         bool "Starfire RTC"
 769         depends on SPARC64
 770         help
 771           If you say Y here you will get support for the RTC found on
 772           Starfire systems.
 773
 774 config RTC_DRV_TX4939
 775         tristate "TX4939 SoC"
 776         depends on SOC_TX4939
 777         help
 778           Driver for the internal RTC (Realtime Clock) module found on
 779           Toshiba TX4939 SoC.
 780
 781 config RTC_DRV_MV
 782         tristate "Marvell SoC RTC"
 783         depends on ARCH_KIRKWOOD
 784         help
 785           If you say yes here you will get support for the in-chip RTC
 786           that can be found in some of Marvell's SoC devices, such as
 787           the Kirkwood 88F6281 and 88F6192.
 788
 789           This driver can also be built as a module. If so, the module
 790           will be called rtc-mv.
 791
 792 config RTC_DRV_PS3
 793         tristate "PS3 RTC"
 794         depends on PPC_PS3
 795         help
 796           If you say yes here you will get support for the RTC on PS3.
 797
 798           This driver can also be built as a module. If so, the module
 799           will be called rtc-ps3.
 800
 801 config RTC_DRV_COH901331
 802         tristate "ST-Ericsson COH 901 331 RTC"
 803         depends on ARCH_U300
 804         help
 805           If you say Y here you will get access to ST-Ericsson
 806           COH 901 331 RTC clock found in some ST-Ericsson Mobile
 807           Platforms.
 808
 809           This driver can also be built as a module. If so, the module
 810           will be called "rtc-coh901331".
 811
 812
 813 config RTC_DRV_STMP
 814         tristate "Freescale STMP3xxx RTC"
 815         depends on ARCH_STMP3XXX
 816         help
 817           If you say yes here you will get support for the onboard
 818           STMP3xxx RTC.
 819
 820           This driver can also be built as a module. If so, the module
 821           will be called rtc-stmp3xxx.
 822
 823 config RTC_DRV_PCAP
 824         tristate "PCAP RTC"
 825         depends on EZX_PCAP
 826         help
 827           If you say Y here you will get support for the RTC found on
 828           the PCAP2 ASIC used on some Motorola phones.
 829
 830 endif # RTC_CLASS