dts: arm: gigadevice: add initial support for gd32f4xx

/*

 * Copyright (c) 2021, Teslabs Engineering S.L.

 *

 * SPDX-License-Identifier: Apache-2.0

 */

#include <arm/armv7-m.dtsi>

/ {

	cpus {

		#address-cells = <1>;

		#size-cells = <0>;

		cpu0: cpu@0 {

			device_type = "cpu";

			compatible = "arm,cortex-m4f";

			reg = <0>;

			#address-cells = <1>;

			#size-cells = <1>;

			mpu: mpu@e000ed90 {

				compatible = "arm,armv7m-mpu";

				reg = <0xe000ed90 0x40>;

				arm,num-mpu-regions = <8>;

			};

		};

	};

	soc {

		sram0: memory@20000000 {

			compatible = "mmio-sram";

			reg = <0x20000000 DT_SIZE_K(112)>;

		};

		fmc: flash-controller@40023c00 {

			compatible = "gd,gd32-flash-controller";

			label = "FMC";

			reg = <0x40023c00 0x400>;

			#address-cells = <1>;

			#size-cells = <1>;

			flash0: flash@8000000 {

				compatible = "soc-nv-flash";

				label = "FLASH0";

			};

		};

		usart0: usart@40011000 {

			compatible = "gd,gd32-usart";

			reg = <0x40011000 0x400>;

			rcu-periph-clock = <0x1104>;

			status = "disabled";

			label = "USART0";

		};

	};

};

&nvic {

	arm,num-irq-priority-bits = <4>;

};