WhyCan Forum(哇酷开发者社区)

/*
 * Virtual cape for SPI0 on connector pins P9.22 P9.21 P9.18 P9.17
 *
 * 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.
 */
/dts-v1/;
/plugin/;

/ {
	compatible = "ti,beaglebone", "ti,beaglebone-black";

	/* identification */
	part-number = "BB-nRF24-SPI0";
	version = "00A0";

	/* state the resources this cape uses */
	exclusive-use =
		/* the pin header uses */
		"P9.17",	/* spi0_cs0 */
		"P9.18",	/* spi0_d1 */
		"P9.21",	/* spi0_d0 */
		"P9.22",	/* spi0_sclk */
		/* the hardware ip uses */
		"spi0";

	fragment@0 {
		target = <&am33xx_pinmux>;
		__overlay__ {
			/* default state has all gpios released and mode set to uart1 */
			bb_spi0_pins: pinmux_bb_spi0_pins {
				pinctrl-single,pins = <
					0x150 0x30	/* spi0_sclk.spi0_sclk, INPUT_PULLUP | MODE0 */
					0x154 0x30	/* spi0_d0.spi0_d0, INPUT_PULLUP | MODE0 */
					0x158 0x10	/* spi0_d1.spi0_d1, OUTPUT_PULLUP | MODE0 */
					0x15c 0x10	/* spi0_cs0.spi0_cs0, OUTPUT_PULLUP | MODE0 */
				>;
			};
		};
	};

	fragment@1 {
		target = <&spi0>;	/* spi0 is numbered correctly */
		__overlay__ {
			status = "okay";
			pinctrl-names = "default";
			pinctrl-0 = <&bb_spi0_pins>;

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

			spidev: spidev@0{
				#address-cells = <1>;
				#size-cells = <0>;

				compatible = "linux,spidev";
				reg = <0>;
				spi-max-frequency = <10000000>;
			};

		};
	};
};