linux_kernel/arch/arc/boot/dts/hsdk.dts

/*
 * Copyright (C) 2017 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/*
 * Device Tree for ARC HS Development Kit
 */
/dts-v1/;

#include <dt-bindings/net/ti-dp83867.h>
#include <dt-bindings/reset/snps,hsdk-reset.h>

/ {
	model = "snps,hsdk";
	compatible = "snps,hsdk";

	#address-cells = <1>;
	#size-cells = <1>;

	chosen {
		bootargs = "earlycon=uart8250,mmio32,0xf0005000,115200n8 console=ttyS0,115200n8 debug print-fatal-signals=1";
	};

	cpus {
		#address-cells = <1>;
		#size-cells = <0>;

		cpu@0 {
			device_type = "cpu";
			compatible = "snps,archs38";
			reg = <0>;
			clocks = <&core_clk>;
		};

		cpu@1 {
			device_type = "cpu";
			compatible = "snps,archs38";
			reg = <1>;
			clocks = <&core_clk>;
		};

		cpu@2 {
			device_type = "cpu";
			compatible = "snps,archs38";
			reg = <2>;
			clocks = <&core_clk>;
		};

		cpu@3 {
			device_type = "cpu";
			compatible = "snps,archs38";
			reg = <3>;
			clocks = <&core_clk>;
		};
	};

	input_clk: input-clk {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <33333333>;
	};

	cpu_intc: cpu-interrupt-controller {
		compatible = "snps,archs-intc";
		interrupt-controller;
		#interrupt-cells = <1>;
	};

	idu_intc: idu-interrupt-controller {
		compatible = "snps,archs-idu-intc";
		interrupt-controller;
		#interrupt-cells = <1>;
		interrupt-parent = <&cpu_intc>;
	};

	arcpct: pct {
		compatible = "snps,archs-pct";
	};

	/* TIMER0 with interrupt for clockevent */
	timer {
		compatible = "snps,arc-timer";
		interrupts = <16>;
		interrupt-parent = <&cpu_intc>;
		clocks = <&core_clk>;
	};

	/* 64-bit Global Free Running Counter */
	gfrc {
		compatible = "snps,archs-timer-gfrc";
		clocks = <&core_clk>;
	};

	soc {
		compatible = "simple-bus";
		#address-cells = <1>;
		#size-cells = <1>;
		interrupt-parent = <&idu_intc>;

		ranges = <0x00000000 0xf0000000 0x10000000>;

		cgu_rst: reset-controller@8a0 {
			compatible = "snps,hsdk-reset";
			#reset-cells = <1>;
			reg = <0x8A0 0x4>, <0xFF0 0x4>;
		};

		core_clk: core-clk@0 {
			compatible = "snps,hsdk-core-pll-clock";
			reg = <0x00 0x10>, <0x14B8 0x4>;
			#clock-cells = <0>;
			clocks = <&input_clk>;
		};

		serial: serial@5000 {
			compatible = "snps,dw-apb-uart";
			reg = <0x5000 0x100>;
			clock-frequency = <33330000>;
			interrupts = <6>;
			baud = <115200>;
			reg-shift = <2>;
			reg-io-width = <4>;
		};

		gmacclk: gmacclk {
			compatible = "fixed-clock";
			clock-frequency = <400000000>;
			#clock-cells = <0>;
		};

		mmcclk_ciu: mmcclk-ciu {
			compatible = "fixed-clock";
			/*
			 * DW sdio controller has external ciu clock divider
			 * controlled via register in SDIO IP. Due to its
			 * unexpected default value (it should divide by 1
			 * but it divides by 8) SDIO IP uses wrong clock and
			 * works unstable (see STAR 9001204800)
			 * We switched to the minimum possible value of the
			 * divisor (div-by-2) in HSDK platform code.
			 * So add temporary fix and change clock frequency
			 * to 50000000 Hz until we fix dw sdio driver itself.
			 */
			clock-frequency = <50000000>;
			#clock-cells = <0>;
		};

		mmcclk_biu: mmcclk-biu {
			compatible = "fixed-clock";
			clock-frequency = <400000000>;
			#clock-cells = <0>;
		};

		ethernet@8000 {
			#interrupt-cells = <1>;
			compatible = "snps,dwmac";
			reg = <0x8000 0x2000>;
			interrupts = <10>;
			interrupt-names = "macirq";
			phy-mode = "rgmii";
			snps,pbl = <32>;
			clocks = <&gmacclk>;
			clock-names = "stmmaceth";
			phy-handle = <&phy0>;
			resets = <&cgu_rst HSDK_ETH_RESET>;
			reset-names = "stmmaceth";

			mdio {
				#address-cells = <1>;
				#size-cells = <0>;
				compatible = "snps,dwmac-mdio";
				phy0: ethernet-phy@0 {
					reg = <0>;
					ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
					ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
					ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
				};
			};
		};

		ohci@60000 {
			compatible = "snps,hsdk-v1.0-ohci", "generic-ohci";
			reg = <0x60000 0x100>;
			interrupts = <15>;
		};

		ehci@40000 {
			compatible = "snps,hsdk-v1.0-ehci", "generic-ehci";
			reg = <0x40000 0x100>;
			interrupts = <15>;
		};

		mmc@a000 {
			compatible = "altr,socfpga-dw-mshc";
			reg = <0xa000 0x400>;
			num-slots = <1>;
			fifo-depth = <16>;
			card-detect-delay = <200>;
			clocks = <&mmcclk_biu>, <&mmcclk_ciu>;
			clock-names = "biu", "ciu";
			interrupts = <12>;
			bus-width = <4>;
		};
	};

	memory@80000000 {
		#address-cells = <1>;
		#size-cells = <1>;
		device_type = "memory";
		reg = <0x80000000 0x40000000>;  /* 1 GiB */
	};
};