samples: Support different base address of the shared mem

Now, in open_amp_rsc_table sample we support only the devices
that have the same value for physical and virtual address.
But, in case they are different, we need to give both addresses.
Therefore, for physical address take the second register block from
ipc_shm node if it exists, otherwise take the first one, as before.

Signed-off-by: Iuliana Prodan <[email protected]>

doc/build/dts/api/api.rst

@@ -421,7 +421,10 @@ device.
    * - zephyr,ipc_shm
      - A node whose ``reg`` is used by the OpenAMP subsystem to determine the
        base address and size of the shared memory (SHM) usable for
-       interprocess-communication (IPC)
+       interprocess-communication (IPC).
+       A second register block is optional and, if used, is the physical address (pa) of
+       the shared memory. The second value for pa register is not used, is just
+       required by devicetree ``reg`` property.
    * - zephyr,itcm
      - Instruction Tightly Coupled Memory node on some Arm SoCs
    * - zephyr,log-uart

samples/subsys/ipc/openamp_rsc_table/src/main_remote.c

@@ -36,6 +36,10 @@ LOG_MODULE_REGISTER(openamp_rsc_table, LOG_LEVEL_DBG);
 #define SHM_START_ADDR	DT_REG_ADDR(SHM_NODE)
 #define SHM_SIZE		DT_REG_SIZE(SHM_NODE)
 
+#define SHM_PHYS_START_ADDR	COND_CODE_1(DT_NUM_REGS(SHM_NODE),  \
+				(DT_REG_ADDR(SHM_NODE)),            \
+				(DT_REG_ADDR_BY_NAME(SHM_NODE, 1))) \
+
 #define APP_TASK_STACK_SIZE (1024)
 
 /* Add 1024 extra bytes for the TTY task stack for the "tx_buff" buffer. */
@@ -52,7 +56,7 @@ static struct k_thread thread_tty_data;
 static const struct device *const ipm_handle =
 	DEVICE_DT_GET(DT_CHOSEN(zephyr_ipc));
 
-static metal_phys_addr_t shm_physmap = SHM_START_ADDR;
+static metal_phys_addr_t shm_physmap = SHM_PHYS_START_ADDR;
 static metal_phys_addr_t rsc_tab_physmap;
 
 static struct metal_io_region shm_io_data; /* shared memory */