19b39406eb
LPTIM is not available in STOP3 mode, so RTC needs to be used instead. This code usese similar approach as STM32WBAx for suspend to ram. The STOP3 is disabled by default in device tree. Signed-off-by: Adam Berlinger <adam.berlinger@st.com>
81 lines
2.2 KiB
Text
81 lines
2.2 KiB
Text
# 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
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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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Use an additional timer while entering Standby mode.
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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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Same approach is used on STM32U5 and STOP3 mode.
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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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