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zephyr/drivers/clock_control/clock_stm32_ll_common.c
Giancarlo Stasi 82a08a7678 drivers: clock: stm32: fix Flash latency & clock settings for MSI & HSE 
According to RM, when increasing the CPU frequency, the new number of
wait states to the Flash latency bits must be written and verified
before modifying the CPU clock source and/or the CPU clock prescaler,
to prevent NMI to occur; when decreasing the CPU frequency, after.
Tested with STM32L462 SOC and MSI with several frequencies, both
increasing and decreasing. HSE built, not tested.

Signed-off-by: Giancarlo Stasi <giancarlo.stasi@nexxiot.com>
2020-06-23 17:32:38 +02:00

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/*
*
* Copyright (c) 2017 Linaro Limited.
* Copyright (c) 2017 RnDity Sp. z o.o.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <soc.h>
#include <drivers/clock_control.h>
#include <sys/util.h>
#include <sys/__assert.h>
#include <drivers/clock_control/stm32_clock_control.h>
#include "clock_stm32_ll_common.h"
/* Macros to fill up prescaler values */
#define z_ahb_prescaler(v) LL_RCC_SYSCLK_DIV_ ## v
#define ahb_prescaler(v) z_ahb_prescaler(v)
#define z_apb1_prescaler(v) LL_RCC_APB1_DIV_ ## v
#define apb1_prescaler(v) z_apb1_prescaler(v)
#ifndef CONFIG_SOC_SERIES_STM32F0X
#define z_apb2_prescaler(v) LL_RCC_APB2_DIV_ ## v
#define apb2_prescaler(v) z_apb2_prescaler(v)
#endif /* CONFIG_SOC_SERIES_STM32F0X */
#define z_mco1_prescaler(v) LL_RCC_MCO1_DIV_ ## v
#define mco1_prescaler(v) z_mco1_prescaler(v)
#define z_mco2_prescaler(v) LL_RCC_MCO2_DIV_ ## v
#define mco2_prescaler(v) z_mco2_prescaler(v)
#ifdef CONFIG_SOC_SERIES_STM32WBX
#define __LL_RCC_CALC_HCLK_FREQ __LL_RCC_CALC_HCLK1_FREQ
#endif /* CONFIG_SOC_SERIES_STM32F0X */
#if CONFIG_CLOCK_STM32_AHB_PRESCALER > 1
/*
* AHB prescaler allows to set a HCLK frequency (feeding cortex systick)
* lower than SYSCLK frequency (actual core frequency).
* Though, zephyr doesn't make a difference today between these two clocks.
* So, changing this prescaler is not allowed until it is made possible to
* use them independently in zephyr clock subsystem.
*/
#error "AHB presacler can't be higher than 1"
#endif
/**
* @brief fill in AHB/APB buses configuration structure
*/
static void config_bus_clk_init(LL_UTILS_ClkInitTypeDef *clk_init)
{
#ifdef CONFIG_SOC_SERIES_STM32WBX
clk_init->CPU1CLKDivider = ahb_prescaler(
CONFIG_CLOCK_STM32_CPU1_PRESCALER);
clk_init->CPU2CLKDivider = ahb_prescaler(
CONFIG_CLOCK_STM32_CPU2_PRESCALER);
clk_init->AHB4CLKDivider = ahb_prescaler(
CONFIG_CLOCK_STM32_AHB4_PRESCALER);
#else
clk_init->AHBCLKDivider = ahb_prescaler(
CONFIG_CLOCK_STM32_AHB_PRESCALER);
#endif /* CONFIG_SOC_SERIES_STM32WBX */
clk_init->APB1CLKDivider = apb1_prescaler(
CONFIG_CLOCK_STM32_APB1_PRESCALER);
#if !defined (CONFIG_SOC_SERIES_STM32F0X) && !defined (CONFIG_SOC_SERIES_STM32G0X)
clk_init->APB2CLKDivider = apb2_prescaler(
CONFIG_CLOCK_STM32_APB2_PRESCALER);
#endif /* CONFIG_SOC_SERIES_STM32F0X && CONFIG_SOC_SERIES_STM32G0X */
}
static uint32_t get_bus_clock(uint32_t clock, uint32_t prescaler)
{
return clock / prescaler;
}
static inline int stm32_clock_control_on(struct device *dev,
clock_control_subsys_t sub_system)
{
struct stm32_pclken *pclken = (struct stm32_pclken *)(sub_system);
ARG_UNUSED(dev);
switch (pclken->bus) {
case STM32_CLOCK_BUS_AHB1:
LL_AHB1_GRP1_EnableClock(pclken->enr);
break;
#if defined(CONFIG_SOC_SERIES_STM32L4X) || \
defined(CONFIG_SOC_SERIES_STM32L5X) || \
defined(CONFIG_SOC_SERIES_STM32F4X) || \
defined(CONFIG_SOC_SERIES_STM32F7X) || \
defined(CONFIG_SOC_SERIES_STM32F2X) || \
defined(CONFIG_SOC_SERIES_STM32WBX) || \
defined(CONFIG_SOC_SERIES_STM32G4X)
case STM32_CLOCK_BUS_AHB2:
LL_AHB2_GRP1_EnableClock(pclken->enr);
break;
#endif /* CONFIG_SOC_SERIES_STM32_* */
case STM32_CLOCK_BUS_APB1:
LL_APB1_GRP1_EnableClock(pclken->enr);
break;
#if defined(CONFIG_SOC_SERIES_STM32L4X) || \
defined(CONFIG_SOC_SERIES_STM32L5X) || \
defined(CONFIG_SOC_SERIES_STM32F0X) || \
defined(CONFIG_SOC_SERIES_STM32WBX) || \
defined(CONFIG_SOC_SERIES_STM32G4X)
case STM32_CLOCK_BUS_APB1_2:
LL_APB1_GRP2_EnableClock(pclken->enr);
break;
#endif /* CONFIG_SOC_SERIES_STM32_* */
#if !defined(CONFIG_SOC_SERIES_STM32F0X)
case STM32_CLOCK_BUS_APB2:
LL_APB2_GRP1_EnableClock(pclken->enr);
break;
#endif /* CONFIG_SOC_SERIES_STM32F0X */
#if defined (CONFIG_SOC_SERIES_STM32L0X) || defined (CONFIG_SOC_SERIES_STM32G0X)
case STM32_CLOCK_BUS_IOP:
LL_IOP_GRP1_EnableClock(pclken->enr);
break;
#endif /* CONFIG_SOC_SERIES_STM32L0X || CONFIG_SOC_SERIES_STM32G0X */
default:
return -ENOTSUP;
}
return 0;
}
static inline int stm32_clock_control_off(struct device *dev,
clock_control_subsys_t sub_system)
{
struct stm32_pclken *pclken = (struct stm32_pclken *)(sub_system);
ARG_UNUSED(dev);
switch (pclken->bus) {
case STM32_CLOCK_BUS_AHB1:
LL_AHB1_GRP1_DisableClock(pclken->enr);
break;
#if defined(CONFIG_SOC_SERIES_STM32L4X) || \
defined(CONFIG_SOC_SERIES_STM32L5X) || \
defined(CONFIG_SOC_SERIES_STM32F4X) || \
defined(CONFIG_SOC_SERIES_STM32F7X) || \
defined(CONFIG_SOC_SERIES_STM32F2X) || \
defined(CONFIG_SOC_SERIES_STM32G4X)
case STM32_CLOCK_BUS_AHB2:
LL_AHB2_GRP1_DisableClock(pclken->enr);
break;
#endif /* CONFIG_SOC_SERIES_STM32_* */
case STM32_CLOCK_BUS_APB1:
LL_APB1_GRP1_DisableClock(pclken->enr);
break;
#if defined(CONFIG_SOC_SERIES_STM32L4X) || \
defined(CONFIG_SOC_SERIES_STM32L5X) || \
defined(CONFIG_SOC_SERIES_STM32F0X) || \
defined(CONFIG_SOC_SERIES_STM32WBX) || \
defined(CONFIG_SOC_SERIES_STM32G4X)
case STM32_CLOCK_BUS_APB1_2:
LL_APB1_GRP2_DisableClock(pclken->enr);
break;
#endif /* CONFIG_SOC_SERIES_STM32_* */
#if !defined(CONFIG_SOC_SERIES_STM32F0X)
case STM32_CLOCK_BUS_APB2:
LL_APB2_GRP1_DisableClock(pclken->enr);
break;
#endif /* CONFIG_SOC_SERIES_STM32F0X */
#ifdef CONFIG_SOC_SERIES_STM32L0X
case STM32_CLOCK_BUS_IOP:
LL_IOP_GRP1_DisableClock(pclken->enr);
break;
#endif /* CONFIG_SOC_SERIES_STM32L0X */
default:
return -ENOTSUP;
}
return 0;
}
static int stm32_clock_control_get_subsys_rate(struct device *clock,
clock_control_subsys_t sub_system,
uint32_t *rate)
{
struct stm32_pclken *pclken = (struct stm32_pclken *)(sub_system);
/*
* Get AHB Clock (= SystemCoreClock = SYSCLK/prescaler)
* SystemCoreClock is preferred to CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC
* since it will be updated after clock configuration and hence
* more likely to contain actual clock speed
*/
uint32_t ahb_clock = SystemCoreClock;
uint32_t apb1_clock = get_bus_clock(ahb_clock,
CONFIG_CLOCK_STM32_APB1_PRESCALER);
#if !defined (CONFIG_SOC_SERIES_STM32F0X) && !defined (CONFIG_SOC_SERIES_STM32G0X)
uint32_t apb2_clock = get_bus_clock(ahb_clock,
CONFIG_CLOCK_STM32_APB2_PRESCALER);
#endif /* CONFIG_SOC_SERIES_STM32F0X && CONFIG_SOC_SERIES_STM32G0X */
ARG_UNUSED(clock);
switch (pclken->bus) {
case STM32_CLOCK_BUS_AHB1:
case STM32_CLOCK_BUS_AHB2:
#ifdef CONFIG_SOC_SERIES_STM32L0X
case STM32_CLOCK_BUS_IOP:
#endif /* CONFIG_SOC_SERIES_STM32L0X */
*rate = ahb_clock;
break;
case STM32_CLOCK_BUS_APB1:
#if defined(CONFIG_SOC_SERIES_STM32L4X) || \
defined(CONFIG_SOC_SERIES_STM32L5X) || \
defined(CONFIG_SOC_SERIES_STM32F0X) || \
defined(CONFIG_SOC_SERIES_STM32WBX) || \
defined(CONFIG_SOC_SERIES_STM32G4X)
case STM32_CLOCK_BUS_APB1_2:
#endif /* CONFIG_SOC_SERIES_STM32_* */
#if defined(CONFIG_SOC_SERIES_STM32G0X)
case STM32_CLOCK_BUS_APB2:
/*
* STM32G0x only has one APB, but two reset/clock enable
* registers for peripherals, so return the APB1 clock rate here
*/
#endif /* CONFIG_SOC_SERIES_STM32G0X */
*rate = apb1_clock;
break;
#if !defined (CONFIG_SOC_SERIES_STM32F0X) && !defined (CONFIG_SOC_SERIES_STM32G0X)
case STM32_CLOCK_BUS_APB2:
*rate = apb2_clock;
break;
#endif /* CONFIG_SOC_SERIES_STM32F0X && CONFIG_SOC_SERIES_STM32G0X */
default:
return -ENOTSUP;
}
return 0;
}
static struct clock_control_driver_api stm32_clock_control_api = {
.on = stm32_clock_control_on,
.off = stm32_clock_control_off,
.get_rate = stm32_clock_control_get_subsys_rate,
};
/*
* Unconditionally switch the system clock source to HSI.
*/
__unused
static void stm32_clock_switch_to_hsi(uint32_t ahb_prescaler)
{
/* Enable HSI if not enabled */
if (LL_RCC_HSI_IsReady() != 1) {
/* Enable HSI */
LL_RCC_HSI_Enable();
while (LL_RCC_HSI_IsReady() != 1) {
/* Wait for HSI ready */
}
}
/* Set HSI as SYSCLCK source */
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);
LL_RCC_SetAHBPrescaler(ahb_prescaler);
while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI) {
}
}
/*
* MCO configure doesn't active requested clock source,
* so please make sure the clock source was enabled.
*/
static inline void stm32_clock_control_mco_init(void)
{
#ifndef CONFIG_CLOCK_STM32_MCO1_SRC_NOCLOCK
LL_RCC_ConfigMCO(MCO1_SOURCE,
mco1_prescaler(CONFIG_CLOCK_STM32_MCO1_DIV));
#endif /* CONFIG_CLOCK_STM32_MCO1_SRC_NOCLOCK */
#ifndef CONFIG_CLOCK_STM32_MCO2_SRC_NOCLOCK
LL_RCC_ConfigMCO(MCO2_SOURCE,
mco2_prescaler(CONFIG_CLOCK_STM32_MCO2_DIV));
#endif /* CONFIG_CLOCK_STM32_MCO2_SRC_NOCLOCK */
}
static int stm32_clock_control_init(struct device *dev)
{
LL_UTILS_ClkInitTypeDef s_ClkInitStruct;
uint32_t hclk_prescaler;
#if defined(CONFIG_CLOCK_STM32_SYSCLK_SRC_HSE) || \
defined(CONFIG_CLOCK_STM32_SYSCLK_SRC_MSI)
uint32_t old_hclk_freq;
uint32_t new_hclk_freq;
#endif
ARG_UNUSED(dev);
/* configure clock for AHB/APB buses */
config_bus_clk_init((LL_UTILS_ClkInitTypeDef *)&s_ClkInitStruct);
/* update local hclk prescaler variable */
#ifdef CONFIG_SOC_SERIES_STM32WBX
hclk_prescaler = s_ClkInitStruct.CPU1CLKDivider;
#else
hclk_prescaler = s_ClkInitStruct.AHBCLKDivider;
#endif /* CONFIG_SOC_SERIES_STM32WBX */
/* Some clocks would be activated by default */
config_enable_default_clocks();
#ifdef CONFIG_CLOCK_STM32_SYSCLK_SRC_PLL
LL_UTILS_PLLInitTypeDef s_PLLInitStruct;
/* configure PLL input settings */
config_pll_init(&s_PLLInitStruct);
/*
* Switch to HSI and disable the PLL before configuration.
* (Switching to HSI makes sure we have a SYSCLK source in
* case we're currently running from the PLL we're about to
* turn off and reconfigure.)
*
* Don't use s_ClkInitStruct.AHBCLKDivider as the AHB
* prescaler here. In this configuration, that's the value to
* use when the SYSCLK source is the PLL, not HSI.
*/
stm32_clock_switch_to_hsi(LL_RCC_SYSCLK_DIV_1);
LL_RCC_PLL_Disable();
#ifdef CONFIG_CLOCK_STM32_PLL_Q_DIVISOR
MODIFY_REG(RCC->PLLCFGR, RCC_PLLCFGR_PLLQ,
CONFIG_CLOCK_STM32_PLL_Q_DIVISOR
<< RCC_PLLCFGR_PLLQ_Pos);
#endif /* CONFIG_CLOCK_STM32_PLL_Q_DIVISOR */
#ifdef CONFIG_CLOCK_STM32_PLL_SRC_MSI
/* Set MSI Range */
LL_RCC_MSI_EnableRangeSelection();
LL_RCC_MSI_SetRange(CONFIG_CLOCK_STM32_MSI_RANGE
<< RCC_CR_MSIRANGE_Pos);
LL_RCC_MSI_SetCalibTrimming(0);
#ifdef CONFIG_CLOCK_STM32_MSI_PLL_MODE
/* Enable MSI hardware auto calibration */
LL_RCC_MSI_EnablePLLMode();
#endif
/* Switch to PLL with MSI as clock source */
LL_PLL_ConfigSystemClock_MSI(&s_PLLInitStruct, &s_ClkInitStruct);
/* Disable other clocks */
LL_RCC_HSI_Disable();
LL_RCC_HSE_Disable();
#elif CONFIG_CLOCK_STM32_PLL_SRC_HSI
/* Switch to PLL with HSI as clock source */
LL_PLL_ConfigSystemClock_HSI(&s_PLLInitStruct, &s_ClkInitStruct);
/* Disable other clocks */
LL_RCC_HSE_Disable();
LL_RCC_MSI_Disable();
#elif CONFIG_CLOCK_STM32_PLL_SRC_HSE
int hse_bypass;
if (IS_ENABLED(CONFIG_CLOCK_STM32_HSE_BYPASS)) {
hse_bypass = LL_UTILS_HSEBYPASS_ON;
} else {
hse_bypass = LL_UTILS_HSEBYPASS_OFF;
}
/* Switch to PLL with HSE as clock source */
LL_PLL_ConfigSystemClock_HSE(
#ifndef CONFIG_SOC_SERIES_STM32WBX
CONFIG_CLOCK_STM32_HSE_CLOCK,
#endif
hse_bypass,
&s_PLLInitStruct,
&s_ClkInitStruct);
/* Disable other clocks */
LL_RCC_HSI_Disable();
LL_RCC_MSI_Disable();
#endif /* CONFIG_CLOCK_STM32_PLL_SRC_* */
#elif CONFIG_CLOCK_STM32_SYSCLK_SRC_HSE
old_hclk_freq = HAL_RCC_GetHCLKFreq();
/* Calculate new SystemCoreClock variable based on HSE freq */
new_hclk_freq = __LL_RCC_CALC_HCLK_FREQ(CONFIG_CLOCK_STM32_HSE_CLOCK,
hclk_prescaler);
#if defined(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC)
__ASSERT(new_hclk_freq == CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC,
"Config mismatch HCLK frequency %u %u",
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC, new_hclk_freq);
#endif
/* If freq increases, set flash latency before any clock setting */
if (new_hclk_freq > old_hclk_freq) {
LL_SetFlashLatency(new_hclk_freq);
}
/* Enable HSE if not enabled */
if (LL_RCC_HSE_IsReady() != 1) {
/* Check if need to enable HSE bypass feature or not */
if (IS_ENABLED(CONFIG_CLOCK_STM32_HSE_BYPASS)) {
LL_RCC_HSE_EnableBypass();
} else {
LL_RCC_HSE_DisableBypass();
}
/* Enable HSE */
LL_RCC_HSE_Enable();
while (LL_RCC_HSE_IsReady() != 1) {
/* Wait for HSE ready */
}
}
/* Set HSE as SYSCLCK source */
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSE);
LL_RCC_SetAHBPrescaler(hclk_prescaler);
while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSE) {
}
/* Update SystemCoreClock variable */
LL_SetSystemCoreClock(new_hclk_freq);
/* Set APB1 & APB2 prescaler*/
LL_RCC_SetAPB1Prescaler(s_ClkInitStruct.APB1CLKDivider);
#if !defined (CONFIG_SOC_SERIES_STM32F0X) && !defined (CONFIG_SOC_SERIES_STM32G0X)
LL_RCC_SetAPB2Prescaler(s_ClkInitStruct.APB2CLKDivider);
#endif /* CONFIG_SOC_SERIES_STM32F0X && CONFIG_SOC_SERIES_STM32G0X */
/* If freq not increased, set flash latency after all clock setting */
if (new_hclk_freq <= old_hclk_freq) {
LL_SetFlashLatency(new_hclk_freq);
}
/* Disable other clocks */
LL_RCC_HSI_Disable();
LL_RCC_MSI_Disable();
LL_RCC_PLL_Disable();
#elif CONFIG_CLOCK_STM32_SYSCLK_SRC_MSI
old_hclk_freq = HAL_RCC_GetHCLKFreq();
/* Calculate new SystemCoreClock variable with MSI freq */
/* MSI freq is defined from RUN range selection */
new_hclk_freq =
__LL_RCC_CALC_HCLK_FREQ(
__LL_RCC_CALC_MSI_FREQ(LL_RCC_MSIRANGESEL_RUN,
CONFIG_CLOCK_STM32_MSI_RANGE << RCC_CR_MSIRANGE_Pos),
hclk_prescaler);
#if defined(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC)
__ASSERT(new_hclk_freq == CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC,
"Config mismatch HCLK frequency %u %u",
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC, new_hclk_freq);
#endif
/* If freq increases, set flash latency before any clock setting */
if (new_hclk_freq > old_hclk_freq) {
LL_SetFlashLatency(new_hclk_freq);
}
/* Set MSI Range */
LL_RCC_MSI_EnableRangeSelection();
LL_RCC_MSI_SetRange(CONFIG_CLOCK_STM32_MSI_RANGE << RCC_CR_MSIRANGE_Pos);
/* Enable MSI if not enabled */
if (LL_RCC_MSI_IsReady() != 1) {
/* Enable MSI */
LL_RCC_MSI_Enable();
while (LL_RCC_MSI_IsReady() != 1) {
/* Wait for HSI ready */
}
#ifdef CONFIG_CLOCK_STM32_MSI_PLL_MODE
/* Enable MSI hardware auto calibration */
LL_RCC_MSI_EnablePLLMode();
#endif
}
/* Set MSI as SYSCLCK source */
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_MSI);
LL_RCC_SetAHBPrescaler(hclk_prescaler);
while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_MSI) {
}
/* Update SystemCoreClock variable */
LL_SetSystemCoreClock(new_hclk_freq);
/* Set APB1 & APB2 prescaler*/
LL_RCC_SetAPB1Prescaler(s_ClkInitStruct.APB1CLKDivider);
LL_RCC_SetAPB2Prescaler(s_ClkInitStruct.APB2CLKDivider);
#ifdef CONFIG_SOC_SERIES_STM32WBX
/* Set C2 AHB & AHB4 prescalers */
LL_C2_RCC_SetAHBPrescaler(s_ClkInitStruct->CPU2CLKDivider);
LL_RCC_SetAHB4Prescaler(s_ClkInitStruct->AHB4CLKDivider);
#endif /* CONFIG_SOC_SERIES_STM32WBX */
/* If freq not increased, set flash latency after all clock setting */
if (new_hclk_freq <= old_hclk_freq) {
LL_SetFlashLatency(new_hclk_freq);
}
/* Disable other clocks */
LL_RCC_HSE_Disable();
LL_RCC_HSI_Disable();
LL_RCC_PLL_Disable();
#elif CONFIG_CLOCK_STM32_SYSCLK_SRC_HSI
stm32_clock_switch_to_hsi(hclk_prescaler);
/* Update SystemCoreClock variable */
LL_SetSystemCoreClock(__LL_RCC_CALC_HCLK_FREQ(HSI_VALUE,
hclk_prescaler));
/* Set APB1 & APB2 prescaler*/
LL_RCC_SetAPB1Prescaler(s_ClkInitStruct.APB1CLKDivider);
#if !defined (CONFIG_SOC_SERIES_STM32F0X) && !defined (CONFIG_SOC_SERIES_STM32G0X)
LL_RCC_SetAPB2Prescaler(s_ClkInitStruct.APB2CLKDivider);
#endif /* CONFIG_SOC_SERIES_STM32F0X && CONFIG_SOC_SERIES_STM32G0X */
/* Set flash latency */
/* HSI used as SYSCLK, set latency to 0 */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_0);
/* Disable other clocks */
LL_RCC_HSE_Disable();
LL_RCC_MSI_Disable();
LL_RCC_PLL_Disable();
#endif /* CONFIG_CLOCK_STM32_SYSCLK_SRC_... */
/* configure MCO1/MCO2 based on Kconfig */
stm32_clock_control_mco_init();
return 0;
}
/**
* @brief RCC device, note that priority is intentionally set to 1 so
* that the device init runs just after SOC init
*/
DEVICE_AND_API_INIT(rcc_stm32, STM32_CLOCK_CONTROL_NAME,
&stm32_clock_control_init,
NULL, NULL,
PRE_KERNEL_1,
CONFIG_CLOCK_CONTROL_STM32_DEVICE_INIT_PRIORITY,
&stm32_clock_control_api);
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