samples: openamp_rsc_table: Add the option to use predefined vring ID

Currently, Zephyr is always sending back notifications to
AP (e.g Linux in our case) on channel 0.

But this currently doesn't work if Linux uses other channel
id for communication. So, add option to use predefined
vring ID that can accomodate Linux used ID.

Signed-off-by: Alexandru Lastur <alexandru.lastur@nxp.com>

lib/open-amp/Kconfig

@@ -18,3 +18,19 @@ config OPENAMP_RSC_TABLE_NUM_RPMSG_BUFF
 	help
 	  This option specifies the number of buffer used in a Vring for
 	  interprocessor communication
+
+config OPENAMP_RSC_TABLE_IPM_RX_ID
+	int "IPM RX channel ID"
+	default 0
+	depends on OPENAMP_RSC_TABLE
+	help
+	   This option specifies the IPM RX channel ID used in a VRING
+	   for interprocessor communication
+
+config OPENAMP_RSC_TABLE_IPM_TX_ID
+	int "IPM TX channel ID"
+	default 1
+	depends on OPENAMP_RSC_TABLE
+	help
+	   This option specifies the IPM TX channel ID used in a VRING
+	   for interprocessor communication

lib/open-amp/resource_table.h

@@ -17,8 +17,8 @@ extern "C" {
 #if (CONFIG_OPENAMP_RSC_TABLE_NUM_RPMSG_BUFF > 0)
 
 #define VDEV_ID                 0xFF
-#define VRING0_ID 0 /* (master to remote) fixed to 0 for Linux compatibility */
-#define VRING1_ID 1 /* (remote to master) fixed to 1 for Linux compatibility */
+#define VRING0_ID               CONFIG_OPENAMP_RSC_TABLE_IPM_RX_ID /* (host to remote) */
+#define VRING1_ID               CONFIG_OPENAMP_RSC_TABLE_IPM_TX_ID /* (remote to host) */
 
 #define VRING_COUNT             2
 #define RPMSG_IPU_C0_FEATURES   1

samples/subsys/ipc/openamp_rsc_table/boards/imx8mp_evk_mimx8ml8_m7.conf

@@ -7,3 +7,5 @@ CONFIG_LOG=y
 CONFIG_LOG_BACKEND_UART=y
 CONFIG_LOG_DEFAULT_LEVEL=0
 CONFIG_LOG_MODE_MINIMAL=y
+CONFIG_OPENAMP_RSC_TABLE_IPM_RX_ID=1
+CONFIG_OPENAMP_RSC_TABLE_IPM_TX_ID=0