drivers: intc: stm32: remove STM32_EXTI_LINE_NONE macro

The EXTI driver API defined in exti_stm32.h is reserved for exclusive usage
by the STM32 GPIO driver, which doesn't use this macro. Since there is no
usecase for it anyways, it can be removed for future-proofing.

The STM32 UART driver is an unintended user of this definition, however.
Replace it with a private #define which is more appropriate anyways.

Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>

drivers/serial/uart_stm32.c

@@ -20,7 +20,6 @@
 #include <zephyr/sys/__assert.h>
 #include <soc.h>
 #include <zephyr/init.h>
-#include <zephyr/drivers/interrupt_controller/exti_stm32.h>
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/pm/policy.h>
 #include <zephyr/pm/device.h>
@@ -67,6 +66,11 @@ LOG_MODULE_REGISTER(uart_stm32, CONFIG_UART_LOG_LEVEL);
 #define HAS_DRIVER_ENABLE 0
 #endif
 
+#ifdef CONFIG_PM
+/* Placeholder value when wakeup-line DT property is not defined */
+#define STM32_WAKEUP_LINE_NONE	0xFFFFFFFF
+#endif
+
 #if HAS_LPUART
 #ifdef USART_PRESC_PRESCALER
 uint32_t lpuartdiv_calc(const uint64_t clock_rate, const uint16_t presc_idx,
@@ -2064,7 +2068,7 @@ static int uart_stm32_registers_configure(const struct device *dev)
 #endif
 		LL_USART_EnableInStopMode(usart);
 
-		if (config->wakeup_line != STM32_EXTI_LINE_NONE) {
+		if (config->wakeup_line != STM32_WAKEUP_LINE_NONE) {
 			/* Prepare the WAKEUP with the expected EXTI line */
 			LL_EXTI_EnableIT_0_31(BIT(config->wakeup_line));
 		}
@@ -2290,7 +2294,7 @@ static void uart_stm32_irq_config_func_##index(const struct device *dev)	\
 	.wakeup_source = DT_INST_PROP(index, wakeup_source),			\
 	.wakeup_line = COND_CODE_1(DT_INST_NODE_HAS_PROP(index, wakeup_line),	\
 			(DT_INST_PROP(index, wakeup_line)),			\
-			(STM32_EXTI_LINE_NONE)),
+			(STM32_WAKEUP_LINE_NONE)),
 #else
 #define STM32_UART_PM_WAKEUP(index) /* Not used */
 #endif

include/zephyr/drivers/interrupt_controller/exti_stm32.h

@@ -23,8 +23,6 @@
 
 #include <zephyr/types.h>
 
-#define STM32_EXTI_LINE_NONE	0xFFFFFFFFU
-
 /**
  * @brief enable EXTI interrupt for specific line
  *