arm64: dts: add support for S6 based Amlogic BL209

Amlogic S6 is an advanced application processor designed for
hybrid OTT/IP Set Top Box and high-end media box applications.

Add basic support for the S6 based Amlogic BL209 board, which describes
the following components: CPU, GIC, IRQ, Timer and UART.
These are capable of booting up into the serial console.

Signed-off-by: Xianwei Zhao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Neil Armstrong <[email protected]>

Author: Xianwei Zhao

arch/arm64/boot/dts/amlogic/Makefile

@@ -3,6 +3,7 @@ dtb-$(CONFIG_ARCH_MESON) += amlogic-a4-a113l2-ba400.dtb
 dtb-$(CONFIG_ARCH_MESON) += amlogic-a5-a113x2-av400.dtb
 dtb-$(CONFIG_ARCH_MESON) += amlogic-c3-c302x-aw409.dtb
 dtb-$(CONFIG_ARCH_MESON) += amlogic-c3-c308l-aw419.dtb
+dtb-$(CONFIG_ARCH_MESON) += amlogic-s6-s905x5-bl209.dtb
 dtb-$(CONFIG_ARCH_MESON) += amlogic-t7-a311d2-an400.dtb
 dtb-$(CONFIG_ARCH_MESON) += amlogic-t7-a311d2-khadas-vim4.dtb
 dtb-$(CONFIG_ARCH_MESON) += meson-a1-ad401.dtb

arch/arm64/boot/dts/amlogic/amlogic-s6-s905x5-bl209.dts

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2025 Amlogic, Inc. All rights reserved.
+ */
+
+/dts-v1/;
+
+#include "amlogic-s6.dtsi"
+/ {
+	model = "Amlogic S905X5 BL209 Development Board";
+	compatible = "amlogic,bl209", "amlogic,s6";
+	interrupt-parent = <&gic>;
+	#address-cells = <2>;
+	#size-cells = <2>;
+
+	aliases {
+		serial0 = &uart_b;
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x0 0x000000 0x0 0xe0000000>,
+		      <0x1 0x000000 0x0 0x20000000>;
+	};
+
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/* 27 MiB reserved for ARM Trusted Firmware */
+		secmon_reserved: secmon@5000000 {
+			compatible = "shared-dma-pool";
+			reg = <0x0 0x05000000 0x0 0x1b00000>;
+			no-map;
+		};
+	};
+};
+
+&uart_b {
+	status = "okay";
+};

arch/arm64/boot/dts/amlogic/amlogic-s6.dtsi

@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2025 Amlogic, Inc. All rights reserved.
+ */
+
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/gpio/gpio.h>
+/ {
+	cpus {
+		#address-cells = <2>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a510";
+			reg = <0x0 0x0>;
+			enable-method = "psci";
+		};
+
+		cpu1: cpu@100 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a510";
+			reg = <0x0 0x100>;
+			enable-method = "psci";
+		};
+
+		cpu2: cpu@200 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a510";
+			reg = <0x0 0x200>;
+			enable-method = "psci";
+		};
+
+		cpu3: cpu@300 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a510";
+			reg = <0x0 0x300>;
+			enable-method = "psci";
+		};
+	};
+
+	timer {
+		compatible = "arm,armv8-timer";
+		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
+	};
+
+	psci {
+		compatible = "arm,psci-1.0";
+		method = "smc";
+	};
+
+	xtal: xtal-clk {
+		compatible = "fixed-clock";
+		clock-frequency = <24000000>;
+		clock-output-names = "xtal";
+		#clock-cells = <0>;
+	};
+
+	soc {
+		compatible = "simple-bus";
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		gic: interrupt-controller@ff200000 {
+			compatible = "arm,gic-v3";
+			#interrupt-cells = <3>;
+			#address-cells = <0>;
+			interrupt-controller;
+			reg = <0x0 0xff200000 0 0x10000>,
+			      <0x0 0xff240000 0 0x80000>;
+			interrupts = <GIC_PPI 9 0xf04>;
+		};
+
+		apb: bus@fe000000 {
+			compatible = "simple-bus";
+			reg = <0x0 0xfe000000 0x0 0x480000>;
+			#address-cells = <2>;
+			#size-cells = <2>;
+			ranges = <0x0 0x0 0x0 0xfe000000 0x0 0x480000>;
+
+			uart_b: serial@7a000 {
+				compatible = "amlogic,s6-uart",
+					     "amlogic,meson-s4-uart";
+				reg = <0x0 0x7a000 0x0 0x18>;
+				interrupts = <GIC_SPI 169 IRQ_TYPE_EDGE_RISING>;
+				clocks = <&xtal>, <&xtal>, <&xtal>;
+				clock-names = "xtal", "pclk", "baud";
+				status = "disabled";
+			};
+		};
+	};
+};