arm: dts: ti: Add Support for J721E SoC

Add initial SoC definition for J721E SoC.
Kernel dts posted here:
https://lore.kernel.org/lkml/20190522161921.20750-1-nm@ti.com/

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/dts/k3-j721e-mcu-wakeup.dtsi b/arch/arm/dts/k3-j721e-mcu-wakeup.dtsi
new file mode 100644
index 0000000..1175fa9
--- /dev/null
+++ b/arch/arm/dts/k3-j721e-mcu-wakeup.dtsi
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree Source for J721E SoC Family MCU/WAKEUP Domain peripherals
+ *
+ * Copyright (C) 2016-2019 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+&cbass_mcu_wakeup {
+	dmsc: dmsc@44083000 {
+		compatible = "ti,k2g-sci";
+		ti,host-id = <12>;
+
+		mbox-names = "rx", "tx";
+
+		mboxes= <&secure_proxy_main 11>,
+			<&secure_proxy_main 13>;
+
+		reg-names = "debug_messages";
+		reg = <0x00 0x44083000 0x0 0x1000>;
+
+		k3_pds: power-controller {
+			compatible = "ti,sci-pm-domain";
+			#power-domain-cells = <2>;
+		};
+
+		k3_clks: clocks {
+			compatible = "ti,k2g-sci-clk";
+			#clock-cells = <2>;
+			ti,scan-clocks-from-dt;
+		};
+
+		k3_reset: reset-controller {
+			compatible = "ti,sci-reset";
+			#reset-cells = <2>;
+		};
+	};
+
+	wkup_pmx0: pinmux@4301c000 {
+		compatible = "pinctrl-single";
+		/* Proxy 0 addressing */
+		reg = <0x00 0x4301c000 0x00 0x178>;
+		#pinctrl-cells = <1>;
+		pinctrl-single,register-width = <32>;
+		pinctrl-single,function-mask = <0xffffffff>;
+	};
+
+	wkup_uart0: serial@42300000 {
+		compatible = "ti,j721e-uart", "ti,am654-uart";
+		reg = <0x00 0x42300000 0x00 0x100>;
+		reg-shift = <2>;
+		reg-io-width = <4>;
+		interrupts = <GIC_SPI 897 IRQ_TYPE_LEVEL_HIGH>;
+		clock-frequency = <48000000>;
+		current-speed = <115200>;
+		power-domains = <&k3_pds 287 TI_SCI_PD_EXCLUSIVE>;
+		clocks = <&k3_clks 287 0>;
+		clock-names = "fclk";
+	};
+
+	mcu_uart0: serial@40a00000 {
+		compatible = "ti,j721e-uart", "ti,am654-uart";
+		reg = <0x00 0x40a00000 0x00 0x100>;
+		reg-shift = <2>;
+		reg-io-width = <4>;
+		interrupts = <GIC_SPI 846 IRQ_TYPE_LEVEL_HIGH>;
+		clock-frequency = <96000000>;
+		current-speed = <115200>;
+		power-domains = <&k3_pds 149 TI_SCI_PD_EXCLUSIVE>;
+		clocks = <&k3_clks 149 0>;
+		clock-names = "fclk";
+	};
+};