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drivers: serial: stm32: Fix compile issues

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The stm32 uart driver fails to build on certian platforms due to
changes introduced by:

commit 3c18bcbf77
Author: Francois Ramu <francois.ramu@st.com>
Date:   Wed Jan 27 10:27:33 2021 +0100

    drivers: serial: stm32 restore uart after lowpower

Fix this by adding some ifdef's around the code that is specific to the
given platforms that the code works on.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This commit is contained in:
Kumar Gala 2021-02-20 13:55:25 -06:00 • committed by Anas Nashif
commit 5a9f997a80
1 changed files with 4 additions and 0 deletions
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4
drivers/serial/uart_stm32.c
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@ -1393,14 +1393,18 @@ static int uart_stm32_set_power_state(const struct device *dev,
/* setting a low power mode */
if (new_state != DEVICE_PM_ACTIVE_STATE) {
#ifdef USART_ISR_BUSY
/* Make sure that no USART transfer is on-going */
while (LL_USART_IsActiveFlag_BUSY(UartInstance) == 1) {
}
#endif
while (LL_USART_IsActiveFlag_TC(UartInstance) == 0) {
}
#ifdef USART_ISR_REACK
/* Make sure that USART is ready for reception */
while (LL_USART_IsActiveFlag_REACK(UartInstance) == 0) {
}
#endif
/* Clear OVERRUN flag */
LL_USART_ClearFlag_ORE(UartInstance);
/* Leave UartInstance unchanged */