[PATCH v3 1/4] arm64: dts: imx93-phycore-som: Add RPMsg overlay

[Primoz Fiser <primoz.fiser@norik.com>]

Add an overlay used for remote processor inter-core communication
between A55 and M33 cores on the phyCORE-i.MX93 SoM based boards.

Overlay adds the required reserved memory regions and enables the
mailbox unit and the M33 core for RPMsg (Remote Processor Messaging
Framework).

Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
---
Changes in v3:
- fix license to match base dts
- add Reviewed-by tag

 arch/arm64/boot/dts/freescale/Makefile        |  4 ++
 .../dts/freescale/imx93-phycore-rpmsg.dtso    | 60 +++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 arch/arm64/boot/dts/freescale/imx93-phycore-rpmsg.dtso

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 0b473a23d120..08a1de299538 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -324,6 +324,10 @@ dtb-$(CONFIG_ARCH_MXC) += imx93-14x14-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-kontron-bl-osm-s.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin.dtb
+
+imx93-phycore-rpmsg-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-segin.dtb imx93-phycore-rpmsg.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx93-phycore-rpmsg.dtb
+
 dtb-$(CONFIG_ARCH_MXC) += imx93-tqma9352-mba91xxca.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-tqma9352-mba93xxca.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-tqma9352-mba93xxla.dtb
diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-rpmsg.dtso b/arch/arm64/boot/dts/freescale/imx93-phycore-rpmsg.dtso
new file mode 100644
index 000000000000..23bede7833f8
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx93-phycore-rpmsg.dtso
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2025 PHYTEC Messtechnik GmbH
+ * Author: Primoz Fiser <primoz.fiser@norik.com>
+ */
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+
+		rsc_table: rsc-table@2021e000 {
+			reg = <0 0x2021e000 0 0x1000>;
+			no-map;
+		};
+
+		vdev0vring0: vdev0vring0@a4000000 {
+			reg = <0 0xa4000000 0 0x8000>;
+			no-map;
+		};
+
+		vdev0vring1: vdev0vring1@a4008000 {
+			reg = <0 0xa4008000 0 0x8000>;
+			no-map;
+		};
+
+		vdev1vring0: vdev1vring0@a4010000 {
+			reg = <0 0xa4010000 0 0x8000>;
+			no-map;
+		};
+
+		vdev1vring1: vdev1vring1@a4018000 {
+			reg = <0 0xa4018000 0 0x8000>;
+			no-map;
+		};
+
+		vdevbuffer: vdevbuffer@a4020000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0xa4020000 0 0x100000>;
+			no-map;
+		};
+	};
+};
+
+&cm33 {
+	mbox-names = "tx", "rx", "rxdb";
+	mboxes = <&mu1 0 1>,
+		 <&mu1 1 1>,
+		 <&mu1 3 1>;
+	memory-region = <&vdevbuffer>, <&vdev0vring0>, <&vdev0vring1>,
+		 <&vdev1vring0>, <&vdev1vring1>, <&rsc_table>;
+	status = "okay";
+};
+
+&mu1 {
+	status = "okay";
+};
-- 
2.34.1