77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
# 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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config NRF_RTC_TIMER
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bool "nRF Real Time Counter (NRF_RTC1) Timer"
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depends on CLOCK_CONTROL
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depends on SOC_COMPATIBLE_NRF
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select TICKLESS_CAPABLE
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select SYSTEM_TIMER_HAS_DISABLE_SUPPORT
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depends on !$(dt_nodelabel_enabled,rtc1)
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help
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This module implements a kernel device driver for the nRF Real Time
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Counter NRF_RTC1 and provides the standard "system clock driver"
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interfaces.
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if NRF_RTC_TIMER
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config NRF_RTC_TIMER_USER_CHAN_COUNT
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int "Additional channels that can be used"
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default 3 if NRF_802154_RADIO_DRIVER
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default 0
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help
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Use nrf_rtc_timer.h API. Driver is not managing allocation of channels.
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config NRF_RTC_TIMER_LOCK_ZERO_LATENCY_IRQS
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# hidden option
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bool
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depends on ZERO_LATENCY_IRQS
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default y if !BT_LL_SW_SPLIT
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help
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Enable use of __disable_irq() to disable Zero Latency IRQs to prevent
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higher priority contexts (including ZLIs) that might preempt the
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handler and call nrf_rtc_timer API from destroying the internal state
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in nrf_rtc_timer.
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config NRF_RTC_TIMER_TRIGGER_OVERFLOW
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bool "Trigger overflow"
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help
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When enabled, a function can be used to trigger RTC overflow and
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effectively shift time into the future.
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choice
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prompt "Clock startup policy"
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default SYSTEM_CLOCK_WAIT_FOR_STABILITY
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config SYSTEM_CLOCK_NO_WAIT
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bool "No wait"
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help
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System clock source is initiated but does not wait for clock readiness.
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When this option is picked, system clock may not be ready when code relying
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on kernel API is executed. Requested timeouts will be prolonged by the
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remaining startup time.
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config SYSTEM_CLOCK_WAIT_FOR_AVAILABILITY
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bool "Wait for availability"
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help
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System clock source initialization waits until clock is available. In some
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systems, clock initially runs from less accurate source which has faster
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startup time and then seamlessly switches to the target clock source when
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it is ready. When this option is picked, system clock is available after
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system clock driver initialization but it may be less accurate. Option is
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equivalent to waiting for stability if clock source does not have
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intermediate state.
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config SYSTEM_CLOCK_WAIT_FOR_STABILITY
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bool "Wait for stability"
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help
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System clock source initialization waits until clock is stable. When this
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option is picked, system clock is available and stable after system clock
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driver initialization.
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endchoice
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endif # NRF_RTC_TIMER
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