u-boot/drivers/timer/Kconfig
maxims@google.com 4697abea62 aspeed: Add drivers common to all Aspeed SoCs
Add support for Watchdog Timer, which is compatible with AST2400 and
AST2500 watchdogs. There is no uclass for Watchdog yet, so the driver
does not follow the driver model. It also uses fixed clock, so no clock
driver is needed.

Add support for timer for Aspeed ast2400/ast2500 devices.
The driver actually controls several devices, but because all devices
share the same Control Register, it is somewhat difficult to completely
decouple them. Since only one timer is needed at the moment, this should
be OK. The timer uses fixed clock, so does not rely on a clock driver.

Add sysreset driver, which uses watchdog timer to do resets and particular
watchdog device to use is hardcoded (0)
Reviewed-by: Simon Glass <sjg@chromium.org>
2017-01-28 14:04:27 -05:00

61 lines
1.9 KiB
Text

menu "Timer Support"
config TIMER
bool "Enable driver model for timer drivers"
depends on DM
help
Enable driver model for timer access. It uses the same API as
lib/time.c, but now implemented by the uclass. The first timer
will be used. The timer is usually a 32 bits free-running up
counter. There may be no real tick, and no timer interrupt.
config TIMER_EARLY
bool "Allow timer to be used early in U-Boot"
depends on TIMER
help
In some cases the timer must be accessible before driver model is
active. Examples include when using CONFIG_TRACE to trace U-Boot's
execution before driver model is set up. Enable this option to
use an early timer. These functions must be supported by your timer
driver: timer_early_get_count() and timer_early_get_rate().
config ALTERA_TIMER
bool "Altera timer support"
depends on TIMER
help
Select this to enable a timer for Altera devices. Please find
details on the "Embedded Peripherals IP User Guide" of Altera.
config SANDBOX_TIMER
bool "Sandbox timer support"
depends on SANDBOX && TIMER
help
Select this to enable an emulated timer for sandbox. It gets
time from host os.
config X86_TSC_TIMER
bool "x86 Time-Stamp Counter (TSC) timer support"
depends on TIMER && X86
default y if X86
help
Select this to enable Time-Stamp Counter (TSC) timer for x86.
config OMAP_TIMER
bool "Omap timer support"
depends on TIMER
help
Select this to enable an timer for Omap devices.
config AST_TIMER
bool "Aspeed ast2400/ast2500 timer support"
depends on TIMER
default y if ARCH_ASPEED
help
Select this to enable timer for Aspeed ast2400/ast2500 devices.
This is a simple sys timer driver, it is compatible with lib/time.c,
but does not support any interrupts. Even though SoC has 8 hardware
counters, they are all treated as a single device by this driver.
This is mostly because they all share several registers which
makes it difficult to completely separate them.
endmenu