arm64: dts: ti: iot2050: Add/enabled mailboxes and carve-outs for R5F cores

Analogously to the am654-base-board, configure the mailboxes for the two
R5F cores, add them and the already existing memory carve-outs to the
related MCU nodes. Allows to load applications under Linux onto the
cores, e.g. the RTI watchdog firmware.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/1776f8be19b39a938d9248fcfc5332b753783c3e.1632657917.git.jan.kiszka@web.de

arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi

@@ -658,11 +658,21 @@ &pcie1_ep {
 };
 
 &mailbox0_cluster0 {
-	status = "disabled";
+	interrupts = <436>;
+
+	mbox_mcu_r5fss0_core0: mbox-mcu-r5fss0-core0 {
+		ti,mbox-tx = <1 0 0>;
+		ti,mbox-rx = <0 0 0>;
+	};
 };
 
 &mailbox0_cluster1 {
-	status = "disabled";
+	interrupts = <432>;
+
+	mbox_mcu_r5fss0_core1: mbox-mcu-r5fss0-core1 {
+		ti,mbox-tx = <1 0 0>;
+		ti,mbox-rx = <0 0 0>;
+	};
 };
 
 &mailbox0_cluster2 {
@@ -705,6 +715,18 @@ &mailbox0_cluster11 {
 	status = "disabled";
 };
 
+&mcu_r5fss0_core0 {
+	memory-region = <&mcu_r5fss0_core0_dma_memory_region>,
+			<&mcu_r5fss0_core0_memory_region>;
+	mboxes = <&mailbox0_cluster0 &mbox_mcu_r5fss0_core0>;
+};
+
+&mcu_r5fss0_core1 {
+	memory-region = <&mcu_r5fss0_core1_dma_memory_region>,
+			<&mcu_r5fss0_core1_memory_region>;
+	mboxes = <&mailbox0_cluster1 &mbox_mcu_r5fss0_core1>;
+};
+
 &icssg0_mdio {
 	status = "disabled";
 };