arm64: dts: Add devicetree for Hisilicon Hi3670 SoC

Add initial devicetree support for Hisilicon Hi3670 SoC which
is similar to Hi3660 SoC with NPU support.

This SoC has Octal core BigLittle CPUs in two clusters(4 * A53 & 4 * A73).

Only UART6 has been added for console support which is
pre configured by the bootloader. A fixed clock is sourcing
the UART6 which will get replaced by the clock driver when available.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/boot/dts/hisilicon/hi3670.dtsi

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dts file for Hisilicon Hi3670 SoC
+ *
+ * Copyright (C) 2016, Hisilicon Ltd.
+ * Copyright (C) 2018, Linaro Ltd.
+ */
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+	compatible = "hisilicon,hi3670";
+	interrupt-parent = <&gic>;
+	#address-cells = <2>;
+	#size-cells = <2>;
+
+	psci {
+		compatible = "arm,psci-0.2";
+		method = "smc";
+	};
+
+	cpus {
+		#address-cells = <2>;
+		#size-cells = <0>;
+
+		cpu-map {
+			cluster0 {
+				core0 {
+					cpu = <&cpu0>;
+				};
+				core1 {
+					cpu = <&cpu1>;
+				};
+				core2 {
+					cpu = <&cpu2>;
+				};
+				core3 {
+					cpu = <&cpu3>;
+				};
+			};
+			cluster1 {
+				core0 {
+					cpu = <&cpu4>;
+				};
+				core1 {
+					cpu = <&cpu5>;
+				};
+				core2 {
+					cpu = <&cpu6>;
+				};
+				core3 {
+					cpu = <&cpu7>;
+				};
+			};
+		};
+
+		cpu0: cpu@0 {
+			compatible = "arm,cortex-a53", "arm,armv8";
+			device_type = "cpu";
+			reg = <0x0 0x0>;
+			enable-method = "psci";
+		};
+
+		cpu1: cpu@1 {
+			compatible = "arm,cortex-a53", "arm,armv8";
+			device_type = "cpu";
+			reg = <0x0 0x1>;
+			enable-method = "psci";
+		};
+
+		cpu2: cpu@2 {
+			compatible = "arm,cortex-a53", "arm,armv8";
+			device_type = "cpu";
+			reg = <0x0 0x2>;
+			enable-method = "psci";
+		};
+
+		cpu3: cpu@3 {
+			compatible = "arm,cortex-a53", "arm,armv8";
+			device_type = "cpu";
+			reg = <0x0 0x3>;
+			enable-method = "psci";
+		};
+
+		cpu4: cpu@100 {
+			compatible = "arm,cortex-a73", "arm,armv8";
+			device_type = "cpu";
+			reg = <0x0 0x100>;
+			enable-method = "psci";
+		};
+
+		cpu5: cpu@101 {
+			compatible = "arm,cortex-a73", "arm,armv8";
+			device_type = "cpu";
+			reg = <0x0 0x101>;
+			enable-method = "psci";
+		};
+
+		cpu6: cpu@102 {
+			compatible = "arm,cortex-a73", "arm,armv8";
+			device_type = "cpu";
+			reg = <0x0 0x102>;
+			enable-method = "psci";
+		};
+
+		cpu7: cpu@103 {
+			compatible = "arm,cortex-a73", "arm,armv8";
+			device_type = "cpu";
+			reg = <0x0 0x103>;
+			enable-method = "psci";
+		};
+	};
+
+	gic: interrupt-controller@e82b0000 {
+		compatible = "arm,gic-400";
+		reg = <0x0 0xe82b1000 0 0x1000>, /* GICD */
+		      <0x0 0xe82b2000 0 0x2000>, /* GICC */
+		      <0x0 0xe82b4000 0 0x2000>, /* GICH */
+		      <0x0 0xe82b6000 0 0x2000>; /* GICV */
+		#interrupt-cells = <3>;
+		#address-cells = <0>;
+		interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(8) |
+					 IRQ_TYPE_LEVEL_HIGH)>;
+		interrupt-controller;
+	};
+
+	timer {
+		compatible = "arm,armv8-timer";
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(8) |
+					  IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(8) |
+					  IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(8) |
+					  IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(8) |
+					  IRQ_TYPE_LEVEL_LOW)>;
+		clock-frequency = <1920000>;
+	};
+
+	soc {
+		compatible = "simple-bus";
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		uart6_clk: clk_19_2M {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <19200000>;
+		};
+
+		uart6: serial@fff32000 {
+			compatible = "arm,pl011", "arm,primecell";
+			reg = <0x0 0xfff32000 0x0 0x1000>;
+			interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&uart6_clk &uart6_clk>;
+			clock-names = "uartclk", "apb_pclk";
+			status = "disabled";
+		};
+	};
+};