u-boot/arch/arm/dts/stm32f746-disco.dts

/*
 * Copyright 2016 - Michael Kurz <michi.kurz@gmail.com>
 * Copyright 2016 - Vikas MANOCHA <vikas.manocha@st.com>
 *
 * Based on:
 * stm32f469-disco.dts from Linux
 * Copyright 2016 - Lee Jones <lee.jones@linaro.org>
 *
 * This file is dual-licensed: you can use it either under the terms
 * of the GPL or the X11 license, at your option. Note that this dual
 * licensing only applies to this file, and not this project as a
 * whole.
 *
 *  a) This file is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of the
 *     License, or (at your option) any later version.
 *
 *     This file is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 * Or, alternatively,
 *
 *  b) Permission is hereby granted, free of charge, to any person
 *     obtaining a copy of this software and associated documentation
 *     files (the "Software"), to deal in the Software without
 *     restriction, including without limitation the rights to use,
 *     copy, modify, merge, publish, distribute, sublicense, and/or
 *     sell copies of the Software, and to permit persons to whom the
 *     Software is furnished to do so, subject to the following
 *     conditions:
 *
 *     The above copyright notice and this permission notice shall be
 *     included in all copies or substantial portions of the Software.
 *
 *     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *     OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *     HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *     WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *     FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *     OTHER DEALINGS IN THE SOFTWARE.
 */

/dts-v1/;
#include "stm32f746.dtsi"
#include <dt-bindings/memory/stm32-sdram.h>

/ {
	model = "STMicroelectronics STM32F746-DISCO board";
	compatible = "st,stm32f746-disco", "st,stm32f746";

	chosen {
		bootargs = "root=/dev/ram rdinit=/linuxrc";
		stdout-path = "serial0:115200n8";
	};

	memory {
		reg = <0xC0000000 0x800000>;
	};

	aliases {
		serial0 = &usart1;
		spi0 = &qspi;
		/* Aliases for gpios so as to use sequence */
		gpio0 = &gpioa;
		gpio1 = &gpiob;
		gpio2 = &gpioc;
		gpio3 = &gpiod;
		gpio4 = &gpioe;
		gpio5 = &gpiof;
		gpio6 = &gpiog;
		gpio7 = &gpioh;
		gpio8 = &gpioi;
		gpio9 = &gpioj;
		gpio10 = &gpiok;
	};

	led1 {
		compatible = "st,led1";
		led-gpio = <&gpioi 1 0>;
	};

	button1 {
		compatible = "st,button1";
		button-gpio = <&gpioi 11 0>;
	};
};

&clk_hse {
	clock-frequency = <25000000>;
};

&usart1 {
	pinctrl-0 = <&usart1_pins_a>;
	pinctrl-names = "default";
	status = "okay";
};

&fmc {
	pinctrl-0 = <&fmc_pins>;
	pinctrl-names = "default";
	status = "okay";

	mr-nbanks = <1>;
	/* Memory configuration from sdram datasheet MT48LC_4M32_B2B5-6A */
	bank1: bank@0 {
	       st,sdram-control = /bits/ 8 <NO_COL_8 NO_ROW_12 MWIDTH_16 BANKS_4
	       				    CAS_3 SDCLK_2 RD_BURST_EN
					    RD_PIPE_DL_0>;
	       st,sdram-timing = /bits/ 8 <TMRD_2 TXSR_6 TRAS_4 TRC_6 TWR_2
	       				   TRP_2 TRCD_2>;
		/* refcount = (64msec/total_row_sdram)*freq - 20 */
	       st,sdram-refcount = < 1542 >;
       };
};

&mac {
	status = "okay";
	pinctrl-0 = <&ethernet_mii>;
	phy-mode = "rmii";
	phy-handle = <&phy0>;

	mdio0 {
		#address-cells = <1>;
		#size-cells = <0>;
		compatible = "snps,dwmac-mdio";
		phy0: ethernet-phy@0 {
			reg = <0>;
		};
	};
};

&qspi {
	pinctrl-0 = <&qspi_pins>;
	status = "okay";

	qflash0: n25q128a {
			#address-cells = <1>;
			#size-cells = <1>;
			compatible = "micron,n25q128a13", "spi-flash";
			spi-max-frequency = <108000000>;
			spi-tx-bus-width = <1>;
			spi-rx-bus-width = <1>;
			memory-map = <0x90000000 0x1000000>;
			reg = <0>;
	};
};