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drivers: usb: stm32: Remove HSI48 activation related code

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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.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
This commit is contained in:
Erwan Gouriou 2022-12-20 12:29:55 +01:00 • committed by Fabio Baltieri
commit fccf4c95c0
1 changed files with 0 additions and 42 deletions
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42
drivers/usb/device/usb_dc_stm32.c
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@ -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) {