58c296b30f
Add support for a backup standby timer in STM32 LPTIM driver for cases when the LPTIM is not available (ie standby low power mode). A counter (typically RTC) is used for such a case. Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
80 lines
2.2 KiB
Plaintext
80 lines
2.2 KiB
Plaintext
# STM32 LPTIM configuration options
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# Copyright (c) 2019 STMicroelectronics
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# SPDX-License-Identifier: Apache-2.0
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DT_CHOSEN_STDBY_TIMER := st,lptim-stdby-timer
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menuconfig STM32_LPTIM_TIMER
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bool "STM32 Low Power Timer [EXPERIMENTAL]"
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default y
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depends on DT_HAS_ST_STM32_LPTIM_ENABLED
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depends on CLOCK_CONTROL && PM
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select TICKLESS_CAPABLE
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select EXPERIMENTAL
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help
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This module implements a kernel device driver for the LowPower Timer
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and provides the standard "system clock driver" interfaces.
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if STM32_LPTIM_TIMER
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choice STM32_LPTIM_CLOCK
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prompt "LPTIM clock value configuration"
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help
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This option is deprecated and configuration of LPTIM domain clock
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using devicetree should be preferred.
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config STM32_LPTIM_CLOCK_LSI
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bool "LSI"
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help
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Use LSI as LPTIM clock
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config STM32_LPTIM_CLOCK_LSE
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bool "LSE"
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help
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Use LSE as LPTIM clock
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endchoice
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config STM32_LPTIM_CLOCK
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int
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default 32768 if STM32_LPTIM_CLOCK_LSE
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default 32000 if STM32_LPTIM_CLOCK_LSI
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config STM32_LPTIM_TIMEBASE
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hex "LPTIM AutoReload value"
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default 0xFFFF if STM32_LPTIM_CLOCK_LSE
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default 0xF9FF if STM32_LPTIM_CLOCK_LSI
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config STM32_LPTIM_TICK_FREQ_RATIO_OVERRIDE
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bool "Override tick to freq ratio check"
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default y if ZTEST
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help
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For LPTIM configuration, a specific tick freq is advised
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depending on LPTIM input clock:
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- LSI(32KHz): 4000 ticks/sec
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- LSE(32678): 4096 ticks/sec
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To prevent misconfigurations, a dedicated check is implemented
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in the driver.
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This options allows to override this check
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config STM32_LPTIM_STDBY_TIMER
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bool "Use an additional timer while entering Standby mode"
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default $(dt_chosen_enabled,$(DT_CHOSEN_STDBY_TIMER))
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depends on COUNTER
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depends on TICKLESS_KERNEL
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select EXPERIMENTAL
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help
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There are chips e.g. STM32WBAX family that use LPTIM as a system timer,
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but LPTIM is not clocked in standby mode. These chips usually have
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another timer that is not stopped, but it has lower frequency e.g.
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RTC, thus it can't be used as a main system timer.
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Use the Standby timer for timeout (wakeup) when the system is entering
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Standby state.
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The chosen Standby timer node has to support setting alarm from the
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counter API.
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endif # STM32_LPTIM_TIMER
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