62d7db4d4d
Timer driver using Microchip 32KHz based RTOS timer as the kernel timer tick. The driver uses one of the 32-bit basic timers to support the kernel's k_busy_wait API which is passed a wait count in 1 us units. The 32-bit basic timer is selected by using device tree chosen rtimer-busy-wait-timer set to the handle of the desired 32-bit basic timer. If this driver is disabled, the build system will select the ARM Cortex-M4 SysTick as the kernel timer tick driver. The user should specify RTOS timer as kernel tick by adding the compatible properity and setting the status property to "okay" at the board or application level device tree. The driver implements two internal API's for use by the SoC PM. These two API's allow the SoC PM layer to disable the timer used for k_busy_wait so the PLL can be disabled in deep sleep. We used a custom API so we can disable this timer in the deep sleep path when we know k_busy_wait will not be called by other drivers or applications. Signed-off-by: Scott Worley <scott.worley@microchip.com>
105 lines
3.5 KiB
Plaintext
105 lines
3.5 KiB
Plaintext
# Timer driver configuration options
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# Copyright (c) 2014-2015 Wind River Systems, Inc.
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# Copyright (c) 2016 Cadence Design Systems, Inc.
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# Copyright (c) 2019 Intel Corp.
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# SPDX-License-Identifier: Apache-2.0
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if SYS_CLOCK_EXISTS
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menu "Timer drivers"
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config TIMER_HAS_64BIT_CYCLE_COUNTER
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bool
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help
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When this option is true, the k_cycle_get_64() call is
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available to provide values from a 64-bit cycle counter.
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config TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
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bool "Timer queries its hardware to find its frequency at runtime"
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help
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The drivers select this option automatically when needed. Do not modify
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this unless you have a very good reason for it.
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config SYSTEM_CLOCK_SLOPPY_IDLE
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bool "Timer allowed to skew uptime clock during idle"
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help
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When true, the timer driver is not required to maintain a
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correct system uptime count when the system enters idle.
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Some platforms may take advantage of this to reduce the
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overhead from regular interrupts required to handle counter
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wraparound conditions.
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config SYSTEM_CLOCK_INIT_PRIORITY
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int "System clock driver initialization priority"
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default 0
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help
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This options can be used to set a specific initialization priority
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value for the system clock driver. As driver initialization might need
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the clock to be running already, you should let the default value as it
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is (0).
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# Hidden option to be selected by individual SoC.
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config TICKLESS_CAPABLE
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bool
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help
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Timer drivers should select this flag if they are capable of
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supporting tickless operation. That is, a call to
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sys_clock_set_timeout() with a number of ticks greater than
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one should be expected not to produce a call to
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sys_clock_announce() (really, not to produce an interrupt at
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all) until the specified expiration.
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config SYSTEM_TIMER_HAS_DISABLE_SUPPORT
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bool
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help
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This option should be selected by drivers implementing support for
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sys_clock_disable() API.
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config SYSTEM_CLOCK_LOCK_FREE_COUNT
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bool
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help
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This option should be selected by drivers implementing a lock free
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cycle count accessor. This is needed for instrumenting spin lock
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hold times.
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source "drivers/timer/Kconfig.altera_avalon"
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source "drivers/timer/Kconfig.ambiq"
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source "drivers/timer/Kconfig.x86"
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source "drivers/timer/Kconfig.arcv2"
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source "drivers/timer/Kconfig.arm_arch"
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source "drivers/timer/Kconfig.cavs"
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source "drivers/timer/Kconfig.cc13xx_cc26xx_rtc"
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source "drivers/timer/Kconfig.cortex_m_systick"
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source "drivers/timer/Kconfig.esp32"
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source "drivers/timer/Kconfig.gecko"
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source "drivers/timer/Kconfig.ite_it8xxx2"
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source "drivers/timer/Kconfig.leon_gptimer"
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source "drivers/timer/Kconfig.litex"
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source "drivers/timer/Kconfig.mchp_xec_rtos"
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source "drivers/timer/Kconfig.mcux_gpt"
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source "drivers/timer/Kconfig.mcux_lptmr"
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source "drivers/timer/Kconfig.mcux_os"
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source "drivers/timer/Kconfig.mec5"
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source "drivers/timer/Kconfig.mips_cp0"
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source "drivers/timer/Kconfig.native_posix"
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source "drivers/timer/Kconfig.npcx_itim"
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source "drivers/timer/Kconfig.nrf_rtc"
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source "drivers/timer/Kconfig.nrf_grtc"
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source "drivers/timer/Kconfig.nrf_xrtc"
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source "drivers/timer/Kconfig.rcar_cmt"
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source "drivers/timer/Kconfig.riscv_machine"
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source "drivers/timer/Kconfig.rv32m1_lptmr"
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source "drivers/timer/Kconfig.sam0_rtc"
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source "drivers/timer/Kconfig.smartbond"
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source "drivers/timer/Kconfig.stm32_lptim"
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source "drivers/timer/Kconfig.ti_dm_timer"
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source "drivers/timer/Kconfig.xlnx_psttc"
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source "drivers/timer/Kconfig.xtensa"
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source "drivers/timer/Kconfig.mtk_adsp"
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source "drivers/timer/Kconfig.sy1xx_sys_timer"
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endmenu
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endif # SYS_CLOCK_EXISTS
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