[PATCH v3 19/33] arm64: dts: ti: k3-am642-tqma64xxl: Add missing cfg for TI IPC Firmware

[Beleswar Padhi <b-padhi@ti.com>]

Currently, only R5F remote processors are enabled for k3-am642-tqma64xxl
whereas the M4F in MCU domain is disabled. Enable the M4F remote
processor at board level by reserving memory carveouts and assigning
mailboxes.

While at it, reserve the MAIN domain timers that are used by R5F remote
processors for ticks to avoid rproc crashes. This config aligns with
other AM64 boards and can be refactored out later.

Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
---
Cc: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Request for review/test of this patch.

v3: Changelog:
1. None

Link to v2:
https://lore.kernel.org/all/20250823160901.2177841-20-b-padhi@ti.com/

v2: Changelog:
1. Re-ordered patch from [PATCH 29/33] to [PATCH v2 19/33].

Link to v1:
https://lore.kernel.org/all/20250814223839.3256046-30-b-padhi@ti.com/

 .../arm64/boot/dts/ti/k3-am642-tqma64xxl.dtsi | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl.dtsi b/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl.dtsi
index 40b619c9a6c9..860b79aa5ef5 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl.dtsi
@@ -79,6 +79,18 @@ main_r5fss1_core1_memory_region: r5f-memory@a3100000 {
 			no-map;
 		};
 
+		mcu_m4fss_dma_memory_region: m4f-dma-memory@a4000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa4000000 0x00 0x100000>;
+			no-map;
+		};
+
+		mcu_m4fss_memory_region: m4f-memory@a4100000 {
+			compatible = "shared-dma-pool";
+			reg = <0x00 0xa4100000 0x00 0xf00000>;
+			no-map;
+		};
+
 		rtos_ipc_memory_region: ipc-memories@a5000000 {
 			reg = <0x00 0xa5000000 0x00 0x00800000>;
 			alignment = <0x1000>;
@@ -167,6 +179,26 @@ mbox_m4_0: mbox-m4-0 {
 	};
 };
 
+/* main_timer8 is used by r5f0-0 */
+&main_timer8 {
+	status = "reserved";
+};
+
+/* main_timer9 is used by r5f0-1 */
+&main_timer9 {
+	status = "reserved";
+};
+
+/* main_timer10 is used by r5f1-0 */
+&main_timer10 {
+	status = "reserved";
+};
+
+/* main_timer11 is used by r5f1-1 */
+&main_timer11 {
+	status = "reserved";
+};
+
 &main_r5fss0 {
 	status = "okay";
 };
@@ -203,6 +235,13 @@ &main_r5fss1_core1 {
 	status = "okay";
 };
 
+&mcu_m4fss {
+	mboxes = <&mailbox0_cluster6 &mbox_m4_0>;
+	memory-region = <&mcu_m4fss_dma_memory_region>,
+			<&mcu_m4fss_memory_region>;
+	status = "okay";
+};
+
 &ospi0 {
 	status = "okay";
 	pinctrl-names = "default";
-- 
2.34.1