[nrf fromlist] boot: zephyr: Add default values of boot detect pins

Change introduces default values of CONFIG_BOOT_SERIAL_DETECT_PIN
and CONFIG_BOOT_USB_DFU_DETECT_PIN. This is needed to prevent build
issues caused by uninitialized Kconfig.

Upstream PR: mcu-tools/mcuboot#1472

Jira: NCSDK-16550

Signed-off-by: Marek Pieta <[email protected]>
(cherry picked from commit fddbe51b5bd4b400f736b28ed040fe87cf1d969a)

Author: MarekPieta

boot/zephyr/Kconfig

@@ -450,6 +450,7 @@ config BOOT_USB_DFU_DETECT_PIN
 	default 13 if BOARD_NRF52DK_NRF52832
 	default 23 if BOARD_NRF5340_DK_NRF5340_CPUAPP || BOARD_NRF5340_DK_NRF5340_CPUAPP_NS
 	default 43 if BOARD_BL5340_DVK_CPUAPP || BOARD_BL5340_DVK_CPUAPP_NS
+	default -1
 	help
 	  Pin on the DFU detect port that triggers DFU mode.
 

boot/zephyr/Kconfig.serial_recovery

@@ -70,6 +70,7 @@ config BOOT_SERIAL_DETECT_PIN
 	default 13 if BOARD_NRF52DK_NRF52832 || BOARD_NRF52833DK_NRF52833
 	default 23 if BOARD_NRF5340PDK_NRF5340_CPUAPP || BOARD_NRF5340PDK_NRF5340_CPUAPP_NS || \
 		BOARD_NRF5340DK_NRF5340_CPUAPP || BOARD_NRF5340DK_NRF5340_CPUAPP_NS
+	default -1
 	help
 	  Pin on the serial detect port that triggers serial recovery mode.
 

boot/zephyr/main.c

@@ -421,6 +421,9 @@ static const struct gpio_dt_spec button0 = GPIO_DT_SPEC_GET(BUTTON_0_NODE, gpios
 
 #if defined(CONFIG_MCUBOOT_SERIAL)
 
+/* The value of -1 is used by default. It must be properly specified for a board before used. */
+BUILD_ASSERT(CONFIG_BOOT_SERIAL_DETECT_PIN != -1);
+
 #define BUTTON_0_GPIO_LABEL CONFIG_BOOT_SERIAL_DETECT_PORT
 #define BUTTON_0_GPIO_PIN CONFIG_BOOT_SERIAL_DETECT_PIN
 #define BUTTON_0_GPIO_FLAGS ((CONFIG_BOOT_SERIAL_DETECT_PIN_VAL) ?\
@@ -429,6 +432,9 @@ static const struct gpio_dt_spec button0 = GPIO_DT_SPEC_GET(BUTTON_0_NODE, gpios
 
 #elif defined(CONFIG_BOOT_USB_DFU_GPIO)
 
+/* The value of -1 is used by default. It must be properly specified for a board before used. */
+BUILD_ASSERT(CONFIG_BOOT_USB_DFU_DETECT_PIN != -1);
+
 #define BUTTON_0_GPIO_LABEL CONFIG_BOOT_USB_DFU_DETECT_PORT
 #define BUTTON_0_GPIO_PIN CONFIG_BOOT_USB_DFU_DETECT_PIN
 #define BUTTON_0_GPIO_FLAGS ((CONFIG_BOOT_USB_DFU_DETECT_PIN_VAL) ?\