drivers/clock_control/Kconfig.stm32

# STM32 MCU clock control driver config

# Copyright (c) 2017 Linaro
# Copyright (c) 2017 RnDity Sp. z o.o.
# Copyright (C) 2025 Savoir-faire Linux, Inc.
# SPDX-License-Identifier: Apache-2.0

menuconfig CLOCK_CONTROL_STM32_CUBE
	bool "STM32 Reset & Clock Control"
	depends on SOC_FAMILY_STM32
	default y
	select USE_STM32_LL_UTILS
	select USE_STM32_LL_RCC if (SOC_SERIES_STM32MP1X || SOC_SERIES_STM32MP13X || \
		SOC_SERIES_STM32MP2X || SOC_SERIES_STM32H7X || SOC_SERIES_STM32H7RSX || \
		SOC_SERIES_STM32F4X || SOC_SERIES_STM32F7X || \
		SOC_SERIES_STM32N6X)
	select RUNTIME_NMI if ($(dt_nodelabel_enabled,clk_hse) && \
		$(dt_nodelabel_bool_prop,clk_hse,css-enabled))
	help
	  Enable driver for Reset & Clock Control subsystem found
	  in STM32 family of MCUs

if CLOCK_CONTROL_STM32_CUBE

DT_STM32_HSE_CLOCK := $(dt_nodelabel_path,clk_hse)
DT_STM32_HSE_CLOCK_FREQ := $(dt_node_int_prop_int,$(DT_STM32_HSE_CLOCK),clock-frequency)

config CLOCK_STM32_HSE_CLOCK
	int "HSE clock value"
	default "$(DT_STM32_HSE_CLOCK_FREQ)" if "$(dt_nodelabel_enabled,clk_hse)"
	default 8000000
	help
	  Value of external high-speed clock (HSE). This symbol could be optionally
	  configured using device tree by setting "clock-frequency" value of clk_hse
	  node. For instance:
	  &clk_hse{
	  status = "okay";
	  clock-frequency = <DT_FREQ_M(25)>;
	  };
	  Note: Device tree configuration is overridden when current symbol is set:
	  CONFIG_CLOCK_STM32_HSE_CLOCK=32000000

config CLOCK_STM32_MUX
	bool "STM32 clock mux driver"
	default y
	depends on DT_HAS_ST_STM32_CLOCK_MUX_ENABLED
	help
	  Enable driver for STM32 clock mux which don't match an
	  existing clock hardware block but allows to select a clock
	  for a specific domain. For instance per_ck clock on STM32H7 or
	  CLK48 clock

menu "STM32WB0 LSI options"
	depends on DT_HAS_ST_STM32WB0_LSI_CLOCK_ENABLED

config STM32WB0_LSI_MEASUREMENT_WINDOW
	int "Size of LSI measurement window (in periods)"
	default 32
	range 23 256
	help
	  Size of the LSI measurement window (# of LSI periods)

	  The measurement process involves waiting for a certain amount of LSI periods
	  to occur, in order to determine precisely the LSI period, and thus frequency.

	  This property controls how much LSI periods are required for each measure.
	  Bigger window sizes increase accuracy of the measure, but increase the time
	  needed to complete it. Since fLSI >= 24kHz, increasing the measurement window
	  size makes each measure roughly 42µs slower in the worst case.

	  Minimal value is a recommendation from RM0505 Rev.1 §25.8.2, and maximum
	  value is a hardware limitation.

config STM32WB0_LSI_RUNTIME_MEASUREMENT_INTERVAL
	int "LSI run-time measurement interval (ms)"
	default 0
	help
	  Interval at which runtime measurements should be performed, in milliseconds

	  Since the LSI RC frequency is affected by temperature, which is not stable
	  across time, it is recommended to perform measurements of the LSI frequency
	  at regular intervals to obtain better accuracy.

	  This property enables runtime LSI measurement if present. In this case,
	  a background thread is created and performs LSI measurements, sleeping
	  the amount of time specified in this property between each measure. This
	  thread is also tasked with updating the control registers of peripherals
	  affected by slow clock drift such as RTC or IWDG, in collaboration with
	  the peripherals' drivers. Note that this increases the memory footprint
	  of the clock control driver, and may increase power consumption.

	  Setting this option to the default value of "0" disables runtime frequency
	  measurements - the result of a single measure performed at boot will be
	  treated as LSI frequency for the lifetime of the application.

endmenu # DT_HAS_ST_STM32WB0_LSI_CLOCK_ENABLED

# Micro-controller Clock Output (MCO) configuration options
config CLOCK_STM32_MCO
	bool
	default y
	depends on DT_HAS_ST_STM32_CLOCK_MCO_ENABLED || DT_HAS_ST_STM32F1_CLOCK_MCO_ENABLED
	help
	  Allows to output various different clock sources onto the MCO pin
	  using a configurable prescaler.

endif # CLOCK_CONTROL_STM32_CUBE