u-boot/arch/arm/dts/sun8i-a23-evb.dts

/*
 * Copyright 2015 Maxime Ripard
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * 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 "sun8i-a23.dtsi"
#include "sunxi-common-regulators.dtsi"

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>

/ {
	model = "Allwinner A23 Evaluation Board";
	compatible = "allwinner,sun8i-a23-evb", "allwinner,sun8i-a23";

	aliases {
		i2c0 = &i2c0;
		i2c1 = &i2c1;
		serial0 = &r_uart;
	};

	chosen {
		stdout-path = "serial0:115200n8";
	};
};

&i2c0 {
	pinctrl-names = "default";
	pinctrl-0 = <&i2c0_pins_a>;
	status = "okay";
};

&i2c1 {
	pinctrl-names = "default";
	pinctrl-0 = <&i2c1_pins_a>;
	status = "okay";
};

&lradc {
	vref-supply = <&reg_vcc3v0>;
	status = "okay";

	button@190 {
		label = "Volume Up";
		linux,code = <KEY_VOLUMEUP>;
		channel = <0>;
		voltage = <190000>;
	};

	button@390 {
		label = "Volume Down";
		linux,code = <KEY_VOLUMEDOWN>;
		channel = <0>;
		voltage = <390000>;
	};

	button@600 {
		label = "Home";
		linux,code = <KEY_HOME>;
		channel = <0>;
		voltage = <600000>;
	};
};

&mmc0 {
	pinctrl-names = "default";
	pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin_evb>;
	vmmc-supply = <&reg_vcc3v0>;
	bus-width = <4>;
	cd-gpios = <&pio 1 4 GPIO_ACTIVE_LOW>; /* PB4 */
	status = "okay";
};

&pio {
	mmc0_cd_pin_evb: mmc0_cd_pin@0 {
		pins = "PB4";
		function = "gpio_in";
		bias-pull-up;
	};
};

/*
 * The RX line has a non-populated resistance. In order to use it, you
 * need to solder R207 on the back of the board in order to close the
 * line and get a working UART.
 */
&r_uart {
	pinctrl-names = "default";
	pinctrl-0 = <&r_uart_pins_a>;
	status = "okay";
};