mirror of
https://github.com/edk2-porting/linux-next.git
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c750090085
Kconfig tweaks to help reduce RTC configuration bugs, by avoiding legacy RTC drivers when the generic RTC framework is enabled: - If rtc-cmos is selected, disable the legacy rtc driver; - When using generic RTC on x86, enable rtc-cmos by default; - In the old "chardev RTC" section of Kconfig, add a comment warning people off these (seven) legacy RTC drivers when the generic framework is in use. People can still use the legacy drivers if they want (or need) to. This doesn't fix the broken dependencies for the legacy "CMOS" RTC driver. Ideally it would be a full list of platforms where it works, not a partial list of ones where it won't. Or better yet, it would depend on a "HAVE_CMOS_RTC" flag defined by various platforms ... surely there's a Kconfig style guideline lurking there. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
538 lines
16 KiB
Plaintext
538 lines
16 KiB
Plaintext
#
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# RTC class/drivers configuration
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#
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config RTC_LIB
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tristate
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menuconfig RTC_CLASS
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tristate "Real Time Clock"
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default n
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depends on !S390
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select RTC_LIB
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help
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Generic RTC class support. If you say yes here, you will
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be allowed to plug one or more RTCs to your system. You will
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probably want to enable one or more of the interfaces below.
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This driver can also be built as a module. If so, the module
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will be called rtc-core.
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if RTC_CLASS
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config RTC_HCTOSYS
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bool "Set system time from RTC on startup and resume"
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depends on RTC_CLASS = y
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default y
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help
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If you say yes here, the system time (wall clock) will be set using
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the value read from a specified RTC device. This is useful to avoid
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unnecessary fsck runs at boot time, and to network better.
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config RTC_HCTOSYS_DEVICE
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string "RTC used to set the system time"
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depends on RTC_HCTOSYS = y
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default "rtc0"
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help
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The RTC device that will be used to (re)initialize the system
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clock, usually rtc0. Initialization is done when the system
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starts up, and when it resumes from a low power state. This
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device should record time in UTC, since the kernel won't do
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timezone correction.
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The driver for this RTC device must be loaded before late_initcall
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functions run, so it must usually be statically linked.
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This clock should be battery-backed, so that it reads the correct
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time when the system boots from a power-off state. Otherwise, your
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system will need an external clock source (like an NTP server).
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If the clock you specify here is not battery backed, it may still
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be useful to reinitialize system time when resuming from system
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sleep states. Do not specify an RTC here unless it stays powered
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during all this system's supported sleep states.
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config RTC_DEBUG
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bool "RTC debug support"
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depends on RTC_CLASS = y
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help
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Say yes here to enable debugging support in the RTC framework
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and individual RTC drivers.
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comment "RTC interfaces"
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config RTC_INTF_SYSFS
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boolean "/sys/class/rtc/rtcN (sysfs)"
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depends on SYSFS
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default RTC_CLASS
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help
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Say yes here if you want to use your RTCs using sysfs interfaces,
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/sys/class/rtc/rtc0 through /sys/.../rtcN.
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This driver can also be built as a module. If so, the module
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will be called rtc-sysfs.
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config RTC_INTF_PROC
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boolean "/proc/driver/rtc (procfs for rtc0)"
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depends on PROC_FS
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default RTC_CLASS
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help
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Say yes here if you want to use your first RTC through the proc
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interface, /proc/driver/rtc. Other RTCs will not be available
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through that API.
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This driver can also be built as a module. If so, the module
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will be called rtc-proc.
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config RTC_INTF_DEV
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boolean "/dev/rtcN (character devices)"
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default RTC_CLASS
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help
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Say yes here if you want to use your RTCs using the /dev
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interfaces, which "udev" sets up as /dev/rtc0 through
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/dev/rtcN. You may want to set up a symbolic link so one
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of these can be accessed as /dev/rtc, which is a name
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expected by "hwclock" and some other programs.
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This driver can also be built as a module. If so, the module
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will be called rtc-dev.
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config RTC_INTF_DEV_UIE_EMUL
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bool "RTC UIE emulation on dev interface"
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depends on RTC_INTF_DEV
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help
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Provides an emulation for RTC_UIE if the underlying rtc chip
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driver does not expose RTC_UIE ioctls. Those requests generate
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once-per-second update interrupts, used for synchronization.
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config RTC_DRV_TEST
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tristate "Test driver/device"
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help
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If you say yes here you get support for the
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RTC test driver. It's a software RTC which can be
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used to test the RTC subsystem APIs. It gets
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the time from the system clock.
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You want this driver only if you are doing development
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on the RTC subsystem. Please read the source code
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for further details.
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This driver can also be built as a module. If so, the module
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will be called rtc-test.
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comment "I2C RTC drivers"
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depends on I2C
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if I2C
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config RTC_DRV_DS1307
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tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00"
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help
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If you say yes here you get support for various compatible RTC
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chips (often with battery backup) connected with I2C. This driver
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should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
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and probably other chips. In some cases the RTC must already
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have been initialized (by manufacturing or a bootloader).
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The first seven registers on these chips hold an RTC, and other
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registers may add features such as NVRAM, a trickle charger for
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the RTC/NVRAM backup power, and alarms. NVRAM is visible in
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sysfs, but other chip features may not be available.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1307.
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config RTC_DRV_DS1374
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tristate "Dallas/Maxim DS1374"
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depends on RTC_CLASS && I2C
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help
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If you say yes here you get support for Dallas Semiconductor
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DS1374 real-time clock chips. If an interrupt is associated
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with the device, the alarm functionality is supported.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1374.
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config RTC_DRV_DS1672
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tristate "Dallas/Maxim DS1672"
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help
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If you say yes here you get support for the
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Dallas/Maxim DS1672 timekeeping chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1672.
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config RTC_DRV_MAX6900
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tristate "Maxim MAX6900"
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help
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If you say yes here you will get support for the
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Maxim MAX6900 I2C RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-max6900.
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config RTC_DRV_RS5C372
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tristate "Ricoh RS5C372A/B, RV5C386, RV5C387A"
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help
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If you say yes here you get support for the
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Ricoh RS5C372A, RS5C372B, RV5C386, and RV5C387A RTC chips.
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This driver can also be built as a module. If so, the module
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will be called rtc-rs5c372.
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config RTC_DRV_ISL1208
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tristate "Intersil ISL1208"
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help
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If you say yes here you get support for the
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Intersil ISL1208 RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-isl1208.
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config RTC_DRV_X1205
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tristate "Xicor/Intersil X1205"
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help
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If you say yes here you get support for the
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Xicor/Intersil X1205 RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-x1205.
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config RTC_DRV_PCF8563
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tristate "Philips PCF8563/Epson RTC8564"
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help
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If you say yes here you get support for the
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Philips PCF8563 RTC chip. The Epson RTC8564
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should work as well.
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This driver can also be built as a module. If so, the module
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will be called rtc-pcf8563.
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config RTC_DRV_PCF8583
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tristate "Philips PCF8583"
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help
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If you say yes here you get support for the Philips PCF8583
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RTC chip found on Acorn RiscPCs. This driver supports the
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platform specific method of retrieving the current year from
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the RTC's SRAM. It will work on other platforms with the same
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chip, but the year will probably have to be tweaked.
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This driver can also be built as a module. If so, the module
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will be called rtc-pcf8583.
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config RTC_DRV_M41T80
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tristate "ST M41T80/81/82/83/84/85/87"
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help
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If you say Y here you will get support for the
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ST M41T80 RTC chips series. Currently following chips are
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supported: M41T80, M41T81, M41T82, M41T83, M41ST84, M41ST85
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and M41ST87.
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This driver can also be built as a module. If so, the module
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will be called rtc-m41t80.
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config RTC_DRV_M41T80_WDT
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bool "ST M41T80 series RTC watchdog timer"
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depends on RTC_DRV_M41T80
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help
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If you say Y here you will get support for the
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watchdog timer in ST M41T80 RTC chips series.
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config RTC_DRV_TWL92330
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boolean "TI TWL92330/Menelaus"
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depends on MENELAUS
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help
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If you say yes here you get support for the RTC on the
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TWL92330 "Menelaus" power management chip, used with OMAP2
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platforms. The support is integrated with the rest of
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the Menelaus driver; it's not separate module.
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config RTC_DRV_S35390A
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tristate "Seiko Instruments S-35390A"
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select BITREVERSE
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help
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If you say yes here you will get support for the Seiko
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Instruments S-35390A.
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This driver can also be built as a module. If so the module
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will be called rtc-s35390a.
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endif # I2C
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comment "SPI RTC drivers"
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if SPI_MASTER
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config RTC_DRV_MAX6902
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tristate "Maxim MAX6902"
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help
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If you say yes here you will get support for the
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Maxim MAX6902 SPI RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-max6902.
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config RTC_DRV_R9701
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tristate "Epson RTC-9701JE"
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help
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If you say yes here you will get support for the
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Epson RTC-9701JE SPI RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-r9701.
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config RTC_DRV_RS5C348
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tristate "Ricoh RS5C348A/B"
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help
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If you say yes here you get support for the
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Ricoh RS5C348A and RS5C348B RTC chips.
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This driver can also be built as a module. If so, the module
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will be called rtc-rs5c348.
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endif # SPI_MASTER
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comment "Platform RTC drivers"
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# this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
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# requires <asm/mc146818rtc.h> defining CMOS_READ/CMOS_WRITE, and a
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# global rtc_lock ... it's not yet just another platform_device.
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config RTC_DRV_CMOS
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tristate "PC-style 'CMOS'"
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depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS
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default y if X86
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help
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Say "yes" here to get direct support for the real time clock
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found in every PC or ACPI-based system, and some other boards.
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Specifically the original MC146818, compatibles like those in
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PC south bridges, the DS12887 or M48T86, some multifunction
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or LPC bus chips, and so on.
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Your system will need to define the platform device used by
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this driver, otherwise it won't be accessible. This means
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you can safely enable this driver if you don't know whether
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or not your board has this kind of hardware.
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This driver can also be built as a module. If so, the module
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will be called rtc-cmos.
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config RTC_DRV_DS1216
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tristate "Dallas DS1216"
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depends on SNI_RM
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help
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If you say yes here you get support for the Dallas DS1216 RTC chips.
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config RTC_DRV_DS1302
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tristate "Dallas DS1302"
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depends on SH_SECUREEDGE5410
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help
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If you say yes here you get support for the Dallas DS1302 RTC chips.
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config RTC_DRV_DS1511
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tristate "Dallas DS1511"
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depends on RTC_CLASS
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help
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If you say yes here you get support for the
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Dallas DS1511 timekeeping/watchdog chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1511.
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config RTC_DRV_DS1553
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tristate "Maxim/Dallas DS1553"
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help
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If you say yes here you get support for the
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Maxim/Dallas DS1553 timekeeping chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1553.
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config RTC_DRV_DS1742
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tristate "Maxim/Dallas DS1742/1743"
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help
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If you say yes here you get support for the
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Maxim/Dallas DS1742/1743 timekeeping chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-ds1742.
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config RTC_DRV_STK17TA8
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tristate "Simtek STK17TA8"
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depends on RTC_CLASS
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help
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If you say yes here you get support for the
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Simtek STK17TA8 timekeeping chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-stk17ta8.
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config RTC_DRV_M48T86
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tristate "ST M48T86/Dallas DS12887"
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help
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If you say Y here you will get support for the
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ST M48T86 and Dallas DS12887 RTC chips.
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This driver can also be built as a module. If so, the module
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will be called rtc-m48t86.
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config RTC_DRV_M48T59
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tristate "ST M48T59"
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help
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If you say Y here you will get support for the
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ST M48T59 RTC chip.
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This driver can also be built as a module, if so, the module
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will be called "rtc-m48t59".
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config RTC_DRV_V3020
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tristate "EM Microelectronic V3020"
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help
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If you say yes here you will get support for the
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EM Microelectronic v3020 RTC chip.
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This driver can also be built as a module. If so, the module
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will be called rtc-v3020.
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comment "on-CPU RTC drivers"
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config RTC_DRV_OMAP
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tristate "TI OMAP1"
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depends on ARCH_OMAP15XX || ARCH_OMAP16XX || ARCH_OMAP730
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help
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Say "yes" here to support the real time clock on TI OMAP1 chips.
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This driver can also be built as a module called rtc-omap.
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config RTC_DRV_S3C
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tristate "Samsung S3C series SoC RTC"
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depends on ARCH_S3C2410
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help
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RTC (Realtime Clock) driver for the clock inbuilt into the
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Samsung S3C24XX series of SoCs. This can provide periodic
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interrupt rates from 1Hz to 64Hz for user programs, and
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wakeup from Alarm.
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The driver currently supports the common features on all the
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S3C24XX range, such as the S3C2410, S3C2412, S3C2413, S3C2440
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and S3C2442.
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This driver can also be build as a module. If so, the module
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will be called rtc-s3c.
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config RTC_DRV_EP93XX
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tristate "Cirrus Logic EP93XX"
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depends on ARCH_EP93XX
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help
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If you say yes here you get support for the
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RTC embedded in the Cirrus Logic EP93XX processors.
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This driver can also be built as a module. If so, the module
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will be called rtc-ep93xx.
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config RTC_DRV_SA1100
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tristate "SA11x0/PXA2xx"
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depends on ARCH_SA1100 || ARCH_PXA
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help
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If you say Y here you will get access to the real time clock
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built into your SA11x0 or PXA2xx CPU.
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To compile this driver as a module, choose M here: the
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module will be called rtc-sa1100.
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config RTC_DRV_SH
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tristate "SuperH On-Chip RTC"
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depends on RTC_CLASS && SUPERH
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help
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Say Y here to enable support for the on-chip RTC found in
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most SuperH processors.
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To compile this driver as a module, choose M here: the
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module will be called rtc-sh.
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config RTC_DRV_VR41XX
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tristate "NEC VR41XX"
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depends on CPU_VR41XX
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help
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If you say Y here you will get access to the real time clock
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built into your NEC VR41XX CPU.
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To compile this driver as a module, choose M here: the
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module will be called rtc-vr41xx.
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config RTC_DRV_PL031
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tristate "ARM AMBA PL031 RTC"
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depends on ARM_AMBA
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help
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If you say Y here you will get access to ARM AMBA
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PrimeCell PL031 RTC found on certain ARM SOCs.
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To compile this driver as a module, choose M here: the
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module will be called rtc-pl031.
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config RTC_DRV_AT32AP700X
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tristate "AT32AP700X series RTC"
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depends on PLATFORM_AT32AP
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help
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Driver for the internal RTC (Realtime Clock) on Atmel AVR32
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AT32AP700x family processors.
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config RTC_DRV_AT91RM9200
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tristate "AT91RM9200 or AT91SAM9RL"
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depends on ARCH_AT91RM9200 || ARCH_AT91SAM9RL
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help
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Driver for the internal RTC (Realtime Clock) module found on
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Atmel AT91RM9200's and AT91SAM9RL chips. On SAM9RL chips
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this is powered by the backup power supply.
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config RTC_DRV_AT91SAM9
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tristate "AT91SAM9x"
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depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
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help
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RTC driver for the Atmel AT91SAM9x internal RTT (Real Time Timer).
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These timers are powered by the backup power supply (such as a
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small coin cell battery), but do not need to be used as RTCs.
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(On AT91SAM9rl chips you probably want to use the dedicated RTC
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module and leave the RTT available for other uses.)
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config RTC_DRV_AT91SAM9_RTT
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int
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range 0 1
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default 0
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prompt "RTT module Number" if ARCH_AT91SAM9263
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depends on RTC_DRV_AT91SAM9
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help
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More than one RTT module is available. You can choose which
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one will be used as an RTC. The default of zero is normally
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OK to use, though some systems use that for non-RTC purposes.
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config RTC_DRV_AT91SAM9_GPBR
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int
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range 0 3 if !ARCH_AT91SAM9263
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range 0 15 if ARCH_AT91SAM9263
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default 0
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prompt "Backup Register Number"
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depends on RTC_DRV_AT91SAM9
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help
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The RTC driver needs to use one of the General Purpose Backup
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Registers (GPBRs) as well as the RTT. You can choose which one
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will be used. The default of zero is normally OK to use, but
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on some systems other software needs to use that register.
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config RTC_DRV_BFIN
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tristate "Blackfin On-Chip RTC"
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depends on BLACKFIN
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help
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If you say yes here you will get support for the
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Blackfin On-Chip Real Time Clock.
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This driver can also be built as a module. If so, the module
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will be called rtc-bfin.
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config RTC_DRV_RS5C313
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tristate "Ricoh RS5C313"
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depends on SH_LANDISK
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help
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If you say yes here you get support for the Ricoh RS5C313 RTC chips.
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endif # RTC_CLASS
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