drivers/rtc/Kconfig

   1 #
   2 # RTC class/drivers configuration
   3 #
   4
   5 menu "Real Time Clock"
   6
   7 config RTC_LIB
   8         tristate
   9
  10 config RTC_CLASS
  11         tristate "RTC class"
  12         depends on EXPERIMENTAL
  13         default n
  14         select RTC_LIB
  15         help
  16           Generic RTC class support. If you say yes here, you will
  17           be allowed to plug one or more RTCs to your system. You will
  18           probably want to enable one or more of the interfaces below.
  19
  20           This driver can also be built as a module. If so, the module
  21           will be called rtc-class.
  22
  23 config RTC_HCTOSYS
  24         bool "Set system time from RTC on startup"
  25         depends on RTC_CLASS = y
  26         default y
  27         help
  28           If you say yes here, the system time will be set using
  29           the value read from the specified RTC device. This is useful
  30           in order to avoid unnecessary fsck runs.
  31
  32 config RTC_HCTOSYS_DEVICE
  33         string "The RTC to read the time from"
  34         depends on RTC_HCTOSYS = y
  35         default "rtc0"
  36         help
  37           The RTC device that will be used as the source for
  38           the system time, usually rtc0.
  39
  40 config RTC_DEBUG
  41         bool "RTC debug support"
  42         depends on RTC_CLASS = y
  43         help
  44           Say yes here to enable debugging support in the RTC framework
  45           and individual RTC drivers.
  46
  47 comment "RTC interfaces"
  48         depends on RTC_CLASS
  49
  50 config RTC_INTF_SYSFS
  51         tristate "sysfs"
  52         depends on RTC_CLASS && SYSFS
  53         default RTC_CLASS
  54         help
  55           Say yes here if you want to use your RTCs using sysfs interfaces,
  56           /sys/class/rtc/rtc0 through /sys/.../rtcN.
  57
  58           This driver can also be built as a module. If so, the module
  59           will be called rtc-sysfs.
  60
  61 config RTC_INTF_PROC
  62         tristate "proc"
  63         depends on RTC_CLASS && PROC_FS
  64         default RTC_CLASS
  65         help
  66           Say yes here if you want to use your first RTC through the proc
  67           interface, /proc/driver/rtc.  Other RTCs will not be available
  68           through that API.
  69
  70           This driver can also be built as a module. If so, the module
  71           will be called rtc-proc.
  72
  73 config RTC_INTF_DEV
  74         tristate "dev"
  75         depends on RTC_CLASS
  76         default RTC_CLASS
  77         help
  78           Say yes here if you want to use your RTCs using the /dev
  79           interfaces, which "udev" sets up as /dev/rtc0 through
  80           /dev/rtcN.  You may want to set up a symbolic link so one
  81           of these can be accessed as /dev/rtc, which is a name
  82           expected by "hwclock" and some other programs.
  83
  84           This driver can also be built as a module. If so, the module
  85           will be called rtc-dev.
  86
  87 config RTC_INTF_DEV_UIE_EMUL
  88         bool "RTC UIE emulation on dev interface"
  89         depends on RTC_INTF_DEV
  90         help
  91           Provides an emulation for RTC_UIE if the underlaying rtc chip
  92           driver does not expose RTC_UIE ioctls.  Those requests generate
  93           once-per-second update interrupts, used for synchronization.
  94
  95 comment "RTC drivers"
  96         depends on RTC_CLASS
  97
  98 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
  99 # requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
 100 # global rtc_lock ... it's not yet just another platform_device.
 101
 102 config RTC_DRV_CMOS
 103         tristate "PC-style 'CMOS' real time clock"
 104         depends on RTC_CLASS && (X86 || ALPHA || ARM26 || ARM \
 105                 || M32R || ATARI || POWERPC)
 106         help
 107           Say "yes" here to get direct support for the real time clock
 108           found in every PC or ACPI-based system, and some other boards.
 109           Specifically the original MC146818, compatibles like those in
 110           PC south bridges, the DS12887 or M48T86, some multifunction
 111           or LPC bus chips, and so on.
 112
 113           Your system will need to define the platform device used by
 114           this driver, otherwise it won't be accessible.  This means
 115           you can safely enable this driver if you don't know whether
 116           or not your board has this kind of hardware.
 117
 118           This driver can also be built as a module. If so, the module
 119           will be called rtc-cmos.
 120
 121 config RTC_DRV_X1205
 122         tristate "Xicor/Intersil X1205"
 123         depends on RTC_CLASS && I2C
 124         help
 125           If you say yes here you get support for the
 126           Xicor/Intersil X1205 RTC chip.
 127
 128           This driver can also be built as a module. If so, the module
 129           will be called rtc-x1205.
 130
 131 config RTC_DRV_DS1307
 132         tristate "Dallas/Maxim DS1307 and similar I2C RTC chips"
 133         depends on RTC_CLASS && I2C
 134         help
 135           If you say yes here you get support for various compatible RTC
 136           chips (often with battery backup) connected with I2C.  This driver
 137           should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
 138           and probably other chips.  In some cases the RTC must already
 139           have been initialized (by manufacturing or a 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.  This driver may not
 144           expose all those available chip features.
 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_DS1553
 150         tristate "Dallas DS1553"
 151         depends on RTC_CLASS
 152         help
 153           If you say yes here you get support for the
 154           Dallas DS1553 timekeeping chip.
 155
 156           This driver can also be built as a module. If so, the module
 157           will be called rtc-ds1553.
 158
 159 config RTC_DRV_ISL1208
 160         tristate "Intersil 1208"
 161         depends on RTC_CLASS && I2C
 162         help
 163           If you say yes here you get support for the
 164           Intersil 1208 RTC chip.
 165
 166           This driver can also be built as a module. If so, the module
 167           will be called rtc-isl1208.
 168
 169 config RTC_DRV_DS1672
 170         tristate "Dallas/Maxim DS1672"
 171         depends on RTC_CLASS && I2C
 172         help
 173           If you say yes here you get support for the
 174           Dallas/Maxim DS1672 timekeeping chip.
 175
 176           This driver can also be built as a module. If so, the module
 177           will be called rtc-ds1672.
 178
 179 config RTC_DRV_DS1742
 180         tristate "Dallas DS1742/1743"
 181         depends on RTC_CLASS
 182         help
 183           If you say yes here you get support for the
 184           Dallas DS1742/1743 timekeeping chip.
 185
 186           This driver can also be built as a module. If so, the module
 187           will be called rtc-ds1742.
 188
 189 config RTC_DRV_OMAP
 190         tristate "TI OMAP1"
 191         depends on RTC_CLASS && ( \
 192                 ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730 )
 193         help
 194           Say "yes" here to support the real time clock on TI OMAP1 chips.
 195           This driver can also be built as a module called rtc-omap.
 196
 197 config RTC_DRV_PCF8563
 198         tristate "Philips PCF8563/Epson RTC8564"
 199         depends on RTC_CLASS && I2C
 200         help
 201           If you say yes here you get support for the
 202           Philips PCF8563 RTC chip. The Epson RTC8564
 203           should work as well.
 204
 205           This driver can also be built as a module. If so, the module
 206           will be called rtc-pcf8563.
 207
 208 config RTC_DRV_PCF8583
 209         tristate "Philips PCF8583"
 210         depends on RTC_CLASS && I2C && ARCH_RPC
 211         help
 212           If you say yes here you get support for the Philips PCF8583
 213           RTC chip found on Acorn RiscPCs.  This driver supports the
 214           platform specific method of retrieving the current year from
 215           the RTC's SRAM.
 216
 217           This driver can also be built as a module. If so, the module
 218           will be called rtc-pcf8583.
 219
 220 config RTC_DRV_RS5C348
 221         tristate "Ricoh RS5C348A/B"
 222         depends on RTC_CLASS && SPI
 223         help
 224           If you say yes here you get support for the
 225           Ricoh RS5C348A and RS5C348B RTC chips.
 226
 227           This driver can also be built as a module. If so, the module
 228           will be called rtc-rs5c348.
 229
 230 config RTC_DRV_RS5C372
 231         tristate "Ricoh RS5C372A/B"
 232         depends on RTC_CLASS && I2C
 233         help
 234           If you say yes here you get support for the
 235           Ricoh RS5C372A and RS5C372B RTC chips.
 236
 237           This driver can also be built as a module. If so, the module
 238           will be called rtc-rs5c372.
 239
 240 config RTC_DRV_S3C
 241         tristate "Samsung S3C series SoC RTC"
 242         depends on RTC_CLASS && ARCH_S3C2410
 243         help
 244           RTC (Realtime Clock) driver for the clock inbuilt into the
 245           Samsung S3C24XX series of SoCs. This can provide periodic
 246           interrupt rates from 1Hz to 64Hz for user programs, and
 247           wakeup from Alarm.
 248
 249           The driver currently supports the common features on all the
 250           S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
 251           and S3C2442.
 252
 253           This driver can also be build as a module. If so, the module
 254           will be called rtc-s3c.
 255
 256 config RTC_DRV_M48T86
 257         tristate "ST M48T86/Dallas DS12887"
 258         depends on RTC_CLASS
 259         help
 260           If you say Y here you will get support for the
 261           ST M48T86 and Dallas DS12887 RTC chips.
 262
 263           This driver can also be built as a module. If so, the module
 264           will be called rtc-m48t86.
 265
 266 config RTC_DRV_EP93XX
 267         tristate "Cirrus Logic EP93XX"
 268         depends on RTC_CLASS && ARCH_EP93XX
 269         help
 270           If you say yes here you get support for the
 271           RTC embedded in the Cirrus Logic EP93XX processors.
 272
 273           This driver can also be built as a module. If so, the module
 274           will be called rtc-ep93xx.
 275
 276 config RTC_DRV_SA1100
 277         tristate "SA11x0/PXA2xx"
 278         depends on RTC_CLASS && (ARCH_SA1100 || ARCH_PXA)
 279         help
 280           If you say Y here you will get access to the real time clock
 281           built into your SA11x0 or PXA2xx CPU.
 282
 283           To compile this driver as a module, choose M here: the
 284           module will be called rtc-sa1100.
 285
 286 config RTC_DRV_SH
 287         tristate "SuperH On-Chip RTC"
 288         depends on RTC_CLASS && SUPERH
 289         help
 290           Say Y here to enable support for the on-chip RTC found in
 291           most SuperH processors.
 292
 293           To compile this driver as a module, choose M here: the
 294           module will be called rtc-sh.
 295
 296 config RTC_DRV_VR41XX
 297         tristate "NEC VR41XX"
 298         depends on RTC_CLASS && CPU_VR41XX
 299         help
 300           If you say Y here you will get access to the real time clock
 301           built into your NEC VR41XX CPU.
 302
 303           To compile this driver as a module, choose M here: the
 304           module will be called rtc-vr41xx.
 305
 306 config RTC_DRV_PL031
 307         tristate "ARM AMBA PL031 RTC"
 308         depends on RTC_CLASS && ARM_AMBA
 309         help
 310           If you say Y here you will get access to ARM AMBA
 311           PrimeCell PL031 UART found on certain ARM SOCs.
 312
 313           To compile this driver as a module, choose M here: the
 314           module will be called rtc-pl031.
 315
 316 config RTC_DRV_AT91RM9200
 317         tristate "AT91RM9200"
 318         depends on RTC_CLASS && ARCH_AT91RM9200
 319         help
 320           Driver for the Atmel AT91RM9200's internal RTC (Realtime Clock).
 321
 322 config RTC_DRV_TEST
 323         tristate "Test driver/device"
 324         depends on RTC_CLASS
 325         help
 326           If you say yes here you get support for the
 327           RTC test driver. It's a software RTC which can be
 328           used to test the RTC subsystem APIs. It gets
 329           the time from the system clock.
 330           You want this driver only if you are doing development
 331           on the RTC subsystem. Please read the source code
 332           for further details.
 333
 334           This driver can also be built as a module. If so, the module
 335           will be called rtc-test.
 336
 337 config RTC_DRV_MAX6902
 338         tristate "Maxim 6902"
 339         depends on RTC_CLASS && SPI
 340         help
 341           If you say yes here you will get support for the
 342           Maxim MAX6902 spi RTC chip.
 343
 344           This driver can also be built as a module. If so, the module
 345           will be called rtc-max6902.
 346
 347 config RTC_DRV_V3020
 348         tristate "EM Microelectronic V3020"
 349         depends on RTC_CLASS
 350         help
 351           If you say yes here you will get support for the
 352           EM Microelectronic v3020 RTC chip.
 353
 354           This driver can also be built as a module. If so, the module
 355           will be called rtc-v3020.
 356
 357 config RTC_DRV_BFIN
 358         tristate "Blackfin On-Chip RTC"
 359         depends on RTC_CLASS && BFIN
 360         help
 361           If you say yes here you will get support for the
 362           Blackfin On-Chip Real Time Clock.
 363
 364           This driver can also be built as a module. If so, the module
 365           will be called rtc-bfin.
 366
 367 endmenu