arm64: dts: imx8qxp: add the rpmsg support

Add the rpmsg support.
- Setup the rpmsg reserved memory, one is used for vring, the other one
is used for shared buffers.
- The mailbox of the lsio mu5a is used by rpmsg on imx8qxp platforms

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>

arch/arm64/boot/dts/freescale/imx8-ss-lsio.dtsi

@@ -137,6 +137,14 @@ lsio_subsys: bus@5d000000 {
 		status = "disabled";
 	};
 
+	lsio_mu5: mailbox@5d200000 {
+		compatible = "fsl,imx6sx-mu";
+		reg = <0x5d200000 0x10000>;
+		interrupts = <GIC_SPI 184 IRQ_TYPE_LEVEL_HIGH>;
+		#mbox-cells = <2>;
+		power-domains = <&pd IMX_SC_R_MU_5A>;
+	};
+
 	lsio_mu13: mailbox@5d280000 {
 		compatible = "fsl,imx8-mu-dsp", "fsl,imx6sx-mu";
 		reg = <0x5d280000 0x10000>;

arch/arm64/boot/dts/freescale/imx8qxp-mek.dts

@@ -513,6 +513,15 @@
 	status = "okay";
 };
 
+&rpmsg{
+	/*
+	 * 64K for one rpmsg instance:
+	 */
+	vdev-nums = <2>;
+	reg = <0x0 0x90000000 0x0 0x20000>;
+	status = "okay";
+};
+
 &usbphy1 {
 	status = "okay";
 };

arch/arm64/boot/dts/freescale/imx8qxp.dtsi

@@ -134,6 +134,15 @@
 		#size-cells = <2>;
 		ranges;
 
+		rpmsg_reserved: rpmsg@0x90000000 {
+			no-map;
+			reg = <0 0x90000000 0 0x400000>;
+		};
+		rpmsg_dma_reserved:rpmsg_dma@0x90400000 {
+			compatible = "shared-dma-pool";
+			no-map;
+			reg = <0 0x90400000 0 0x1C00000>;
+		};
 		dsp_reserved: dsp@92400000 {
 			reg = <0 0x92400000 0 0x2000000>;
 			no-map;
@@ -313,6 +322,22 @@
 		status = "disabled";
 	};
 
+	rpmsg: rpmsg{
+		compatible = "fsl,imx8qxp-rpmsg";
+		/* up to now, the following channels are used in imx rpmsg
+		 * - tx1/rx1: messages channel.
+		 * - general interrupt1: remote proc finish re-init rpmsg stack
+		 *   when A core is partition reset.
+		 */
+		mbox-names = "tx", "rx", "rxdb";
+		mboxes = <&lsio_mu5 0 1
+			  &lsio_mu5 1 1
+			  &lsio_mu5 3 1>;
+		mub-partition = <3>;
+		memory-region = <&rpmsg_dma_reserved>;
+		status = "disabled";
+	};
+
 	imx8_gpu_ss: imx8_gpu_ss {
 		compatible = "fsl,imx8qxp-gpu", "fsl,imx8-gpu-ss";
 		cores = <&gpu_3d0>;