arm64: dts: ti: k3-am654-base-board: Reserve memory for IPC between R5F cores

Add a reserved memory node to reserve a portion of the DDR memory to be
used for performing inter-processor communication between all the MCU R5F
remote processors running RTOS on all the TI AM654 boards. This memory
shall be exercised only if the MCU R5FSS cluster is configured for Split
mode.  A single 1 MB of memory at 0xa2000000 is reserved for this purpose,
and this accounts for all the vrings and vring buffers between pair of
these R5F remote processors.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20201029033802.15366-5-s-anna@ti.com

diff --git a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
index 23a1f266d1d4ccb753bd267d5dff4c6f5ac8a9fc..17f3a85360e6888d21f37f50d4dc714b932504b9 100644 (file)
--- a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
@@ -59,6 +59,12 @@
                        reg = <0 0xa1100000 0 0xf00000>;
                        no-map;
                };
+
+               rtos_ipc_memory_region: ipc-memories@a2000000 {
+                       reg = <0x00 0xa2000000 0x00 0x00100000>;
+                       alignment = <0x1000>;
+                       no-map;
+               };
        };
 
        gpio-keys {