README.md

Test initially with:

sudo modprobe fbtft_device name=adafruit28 busnum=2 cs=1 rotate=90 gpios=reset:86,dc:45

Build the overlay:

dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /lib/firmware/am335x-spilcd-adafruit28.dtbo am335x-spilcd-adafruit28.dts

am335x-spilcd-adafruit28.dts

/*
 * Copyright (C) 2017 Jason Kridner, Texas Instruments Incorporated
 *
 * 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,am335x-bone", "ti,am335x-pocketbeagle";

	fragment@0 {
		target = <&spi1>;
		__overlay__ {
			status = "okay";

			spidev@0{
				status = "disabled";
			};

			spidev@1{
				status = "disabled";
			};
		};
	};

	fragment@1 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;

			adafruit28: adafruit28@0{
				compatible = "ilitek,ili9341";
				reg = <0>;
				buswidth = <8>;
				reset-gpios = <&gpio2 22 0>;
				dc-gpios = <&gpio2 1 0>;
				debug = <0>;
				spi-max-frequency = <32000000>;
				rotate = <270>;
				/* bgr; */
				fps = <30>;				
			};
		};
	};

	__overrides__ {
		speed =   <&rpidisplay>,"spi-max-frequency:0";
		rotate =  <&rpidisplay>,"rotate:0";
		fps =     <&rpidisplay>,"fps:0";
		debug =   <&rpidisplay>,"debug:0";
	};
};

am335x-XXX-adafruit28.dts

/dts-v1/;

#include "am335x-XXX-common.dtsi"
#include "am335x-peripheral-spi0.dtsi"

&spi1 {
        #address-cells = <1>;
        #size-cells = <0>;
        status = "okay";

        adafruit28: adafruit28@1{
                compatible = "ilitek,ili9341";
                reg = <1>;
                buswidth = <8>;
                reset-gpios = <&gpio2 22 0>;
                dc-gpios = <&gpio1 13 0>;
                debug = <1>;
                spi-max-frequency = <32000000>;
                rotate = <90>;
                /* bgr; */
                fps = <30>;
        };
};