drivers: usb: stm32: Remove HSI48 activation related code
Remove this code to clean up the driver.
Clock activation is done from device tree configuration in clock_control
driver.
Users are informed by warning about missing configuration.
@@ -227,29 +227,6 @@ static int usb_dc_stm32_clock_enable(void)
/* Deprecated: enable HSI48 using device tree */
#warning USB device requires HSI48 clock to be enabled using device tree
#endif /* ! STM32_HSI48_ENABLED*/
- /*
- * In STM32L0 series, HSI48 requires VREFINT and its buffer
- * with 48 MHz RC to be enabled.
- * See ENREF_HSI48 in reference manual RM0367 section10.2.3:
- * "Reference control and status register (SYSCFG_CFGR3)"
- */
-#ifdef CONFIG_SOC_SERIES_STM32L0X
- if (LL_APB2_GRP1_IsEnabledClock(LL_APB2_GRP1_PERIPH_SYSCFG)) {
- LL_SYSCFG_VREFINT_EnableHSI48();
- } else {
- LOG_ERR("System Configuration Controller clock is "
- "disabled. Unable to enable VREFINT which "
- "is required by HSI48.");
- }
-#endif /* CONFIG_SOC_SERIES_STM32L0X */
-
- z_stm32_hsem_lock(CFG_HW_CLK48_CONFIG_SEMID, HSEM_LOCK_DEFAULT_RETRY);
-
- /* Keeping this sequence for legacy: */
- LL_RCC_HSI48_Enable();
- while (!LL_RCC_HSI48_IsReady()) {
- /* Wait for HSI48 to become ready */
- }
LL_RCC_SetUSBClockSource(LL_RCC_USB_CLKSOURCE_HSI48);
@@ -258,13 +235,6 @@ static int usb_dc_stm32_clock_enable(void)
LL_PWR_EnableVDDUSB();
#endif /* CONFIG_SOC_SERIES_STM32U5X */
-#if !defined(CONFIG_SOC_SERIES_STM32WBX)
- /* Specially for STM32WB, don't unlock the HSEM to prevent M0 core
- * to disable HSI48 clock used for RNG.
- */
- z_stm32_hsem_unlock(CFG_HW_CLK48_CONFIG_SEMID);
-#endif /* CONFIG_SOC_SERIES_STM32WBX */
-
#elif defined(LL_RCC_USB_CLKSOURCE_NONE)
/* When MSI is configured in PLL mode with a 32.768 kHz clock source,
* the MSI frequency can be automatically trimmed by hardware to reach
@@ -1019,18 +989,6 @@ int usb_dc_detach(void)
HAL_StatusTypeDef status;
int ret;
-#ifdef CONFIG_SOC_SERIES_STM32WBX
- /* Specially for STM32WB, unlock the HSEM when USB is no more used. */
- z_stm32_hsem_unlock(CFG_HW_CLK48_CONFIG_SEMID);
-
- /*
- * TODO: AN5289 notes a process of locking Sem0, with possible waits
- * via interrupts before switching off CLK48, but lacking any actual
- * examples of that, that remains to be implemented. See
- * https://github.com/zephyrproject-rtos/zephyr/pull/25850
- */
-#endif /* CONFIG_SOC_SERIES_STM32WBX */
-
LOG_DBG("HAL_PCD_DeInit");
status = HAL_PCD_DeInit(&usb_dc_stm32_state.pcd);
if (status != HAL_OK) {
