[nrf fromlist] samples: drivers: mbox: allow to configure RX/TX channels

By adding Kconfig options for both samples.

Upstream PR: zephyrproject-rtos/zephyr#69303

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
(cherry picked from commit 253593c966f339e7aebbdbbbb8126963f3529ebe)

samples/drivers/mbox/Kconfig

@@ -9,3 +9,16 @@ config INCLUDE_REMOTE_DIR
 	help
 	  Include remote build header files. Can be used if primary image
 	  needs to be aware of size or base address of secondary image
+
+config TX_CHANNEL_ID
+	int "Channel ID for TX"
+	default 1
+	help
+	  Channel ID for TX
+
+
+config RX_CHANNEL_ID
+	int "Channel ID for RX"
+	default 0
+	help
+	  Channel ID for RX

samples/drivers/mbox/remote/Kconfig

@@ -0,0 +1,17 @@
+# Copyright 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+source "Kconfig.zephyr"
+
+config TX_CHANNEL_ID
+	int "Channel ID for TX"
+	default 0
+	help
+	  Channel ID for TX
+
+
+config RX_CHANNEL_ID
+	int "Channel ID for RX"
+	default 1
+	help
+	  Channel ID for RX

samples/drivers/mbox/remote/src/main.c

@@ -9,9 +9,6 @@
 #include <zephyr/kernel.h>
 #include <zephyr/drivers/mbox.h>
 
-#define TX_ID (0)
-#define RX_ID (1)
-
 static void callback(const struct device *dev, uint32_t channel,
 		     void *user_data, struct mbox_msg *data)
 {
@@ -28,8 +25,8 @@ int main(void)
 
 	dev = DEVICE_DT_GET(DT_NODELABEL(mbox));
 
-	mbox_init_channel(&tx_channel, dev, TX_ID);
-	mbox_init_channel(&rx_channel, dev, RX_ID);
+	mbox_init_channel(&tx_channel, dev, CONFIG_TX_CHANNEL_ID);
+	mbox_init_channel(&rx_channel, dev, CONFIG_RX_CHANNEL_ID);
 
 	if (mbox_register_callback(&rx_channel, callback, NULL)) {
 		printk("mbox_register_callback() error\n");

samples/drivers/mbox/src/main.c

@@ -9,9 +9,6 @@
 #include <zephyr/kernel.h>
 #include <zephyr/drivers/mbox.h>
 
-#define TX_ID (1)
-#define RX_ID (0)
-
 static void callback(const struct device *dev, uint32_t channel,
 		     void *user_data, struct mbox_msg *data)
 {
@@ -28,8 +25,8 @@ int main(void)
 
 	dev = DEVICE_DT_GET(DT_NODELABEL(mbox));
 
-	mbox_init_channel(&tx_channel, dev, TX_ID);
-	mbox_init_channel(&rx_channel, dev, RX_ID);
+	mbox_init_channel(&tx_channel, dev, CONFIG_TX_CHANNEL_ID);
+	mbox_init_channel(&rx_channel, dev, CONFIG_RX_CHANNEL_ID);
 
 	if (mbox_register_callback(&rx_channel, callback, NULL)) {
 		printk("mbox_register_callback() error\n");