[PATCH v3 27/33] arm64: dts: ti: k3-j784s4-ti-ipc-firmware: Refactor IPC cfg into new dtsi

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

The TI K3 J784S4 SoCs have multiple programmable remote processors like
R5F, C7x etc. The TI SDKs for J784S4 SoCs offer sample firmwares which
could be run on these cores to demonstrate an "echo" IPC test. Those
firmware require certain memory carveouts to be reserved from system
memory, timers to be reserved, and certain mailbox configurations for
interrupt based messaging. These configurations could be different for a
different firmware.

While DT is not meant for system configurations, at least refactor these
configurations from board level DTS into a dtsi for now. This dtsi for
TI IPC firmware is board-independent and can be applied to all boards
from the same SoC Family. This gets rid of code duplication and allows
more freedom for users developing custom firmware (or no firmware) to
utilize system resources better; easily by swapping out this dtsi. To
maintain backward compatibility, the dtsi is included in all boards.

This patch only refactors the C71_3 remote processor related nodes into
the new dtsi. All other nodes have been refactored in the previous
commit as part of k3-j784s4-j742s2-ti-ipc-firmware-common.dtsi.

Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
---
v3: Changelog:
1. None

Link to v2:
https://lore.kernel.org/all/20250823160901.2177841-28-b-padhi@ti.com/

v2: Changelog:
1. Re-ordered patch from [PATCH 12/33] to [PATCH v2 27/33].

Link to v1:
https://lore.kernel.org/all/20250814223839.3256046-13-b-padhi@ti.com/

 arch/arm64/boot/dts/ti/k3-am69-sk.dts         | 27 +-------------
 arch/arm64/boot/dts/ti/k3-j784s4-evm.dts      | 26 +-------------
 .../dts/ti/k3-j784s4-ti-ipc-firmware.dtsi     | 35 +++++++++++++++++++
 3 files changed, 37 insertions(+), 51 deletions(-)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j784s4-ti-ipc-firmware.dtsi

diff --git a/arch/arm64/boot/dts/ti/k3-am69-sk.dts b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
index 3acd86b7845a..7d0ed596c9d8 100644
--- a/arch/arm64/boot/dts/ti/k3-am69-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
@@ -60,18 +60,6 @@ mcu_r5fss0_core0_memory_region: r5f-memory@a0100000 {
 			reg = <0x00 0xa0100000 0x00 0xf00000>;
 			no-map;
 		};
-
-		c71_3_dma_memory_region: c71-dma-memory@ab000000 {
-			compatible = "shared-dma-pool";
-			reg = <0x00 0xab000000 0x00 0x100000>;
-			no-map;
-		};
-
-		c71_3_memory_region: c71-memory@ab100000 {
-			compatible = "shared-dma-pool";
-			reg = <0x00 0xab100000 0x00 0xf00000>;
-			no-map;
-		};
 	};
 
 	vusb_main: regulator-vusb-main5v0 {
@@ -520,13 +508,6 @@ &phy_gmii_sel {
 	bootph-all;
 };
 
-&mailbox0_cluster5 {
-	mbox_c71_3: mbox-c71-3 {
-		ti,mbox-rx = <2 0 0>;
-		ti,mbox-tx = <3 0 0>;
-	};
-};
-
 &wkup_uart0 {
 	/* Firmware usage */
 	status = "reserved";
@@ -795,13 +776,6 @@ &mcu_cpsw_port1 {
 	bootph-all;
 };
 
-&c71_3 {
-	status = "okay";
-	mboxes = <&mailbox0_cluster5 &mbox_c71_3>;
-	memory-region = <&c71_3_dma_memory_region>,
-			<&c71_3_memory_region>;
-};
-
 &wkup_gpio_intr {
 	status = "okay";
 };
@@ -1086,3 +1060,4 @@ &usb0 {
 };
 
 #include "k3-j784s4-j742s2-ti-ipc-firmware-common.dtsi"
+#include "k3-j784s4-ti-ipc-firmware.dtsi"
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
index a84bde08f85e..6c7458c76f53 100644
--- a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
@@ -27,31 +27,7 @@ memory@80000000 {
 	reserved_memory: reserved-memory {
 		#address-cells = <2>;
 		#size-cells = <2>;
-
-		c71_3_dma_memory_region: c71-dma-memory@ab000000 {
-			compatible = "shared-dma-pool";
-			reg = <0x00 0xab000000 0x00 0x100000>;
-			no-map;
-		};
-
-		c71_3_memory_region: c71-memory@ab100000 {
-			compatible = "shared-dma-pool";
-			reg = <0x00 0xab100000 0x00 0xf00000>;
-			no-map;
-		};
-	};
-};
-
-&mailbox0_cluster5 {
-	mbox_c71_3: mbox-c71-3 {
-		ti,mbox-rx = <2 0 0>;
-		ti,mbox-tx = <3 0 0>;
 	};
 };
 
-&c71_3 {
-	mboxes = <&mailbox0_cluster5 &mbox_c71_3>;
-	memory-region = <&c71_3_dma_memory_region>,
-			<&c71_3_memory_region>;
-	status = "okay";
-};
+#include "k3-j784s4-ti-ipc-firmware.dtsi"
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-ti-ipc-firmware.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-ti-ipc-firmware.dtsi
new file mode 100644
index 000000000000..23020c0bbb28
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-ti-ipc-firmware.dtsi
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * Device Tree Source for enabling IPC using TI SDK firmware on J784S4 SoCs
+ *
+ * Copyright (C) 2022-2025 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+&reserved_memory {
+	c71_3_dma_memory_region: c71-dma-memory@ab000000 {
+		compatible = "shared-dma-pool";
+		reg = <0x00 0xab000000 0x00 0x100000>;
+		no-map;
+	};
+
+	c71_3_memory_region: c71-memory@ab100000 {
+		compatible = "shared-dma-pool";
+		reg = <0x00 0xab100000 0x00 0xf00000>;
+		no-map;
+	};
+};
+
+&mailbox0_cluster5 {
+
+	mbox_c71_3: mbox-c71-3 {
+		ti,mbox-rx = <2 0 0>;
+		ti,mbox-tx = <3 0 0>;
+	};
+};
+
+&c71_3 {
+	mboxes = <&mailbox0_cluster5 &mbox_c71_3>;
+	memory-region = <&c71_3_dma_memory_region>,
+			<&c71_3_memory_region>;
+	status = "okay";
+};
-- 
2.34.1