playa-bbb-00A0.dts
/*
 * Copyright 2019
 * Petre Rodan <2b4eda@subdimension.ro>
 * 
 * This program 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 program 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.
 * 
 */

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/pinctrl/am33xx.h>
#include <dt-bindings/board/am335x-bbw-bbb-base.h>
#include <dt-bindings/interrupt-controller/irq.h>

/dts-v1/;
/plugin/;

/ {
    compatible = "ti,beaglebone-black";
    part-number = "playa";
    version = "00A0";

    exclusive-use = 
        "P9.12",                // VS1063 DREQ IRQ
        "P9.13",                // VS1063 XRESET
        "P9.14",                // VS1063 SPI CS command
        "P9.16",                // VS1063 SPI CS data
        "P9.17",                // fake SPI CS
        "P9.18",                // SPI MOSI
        "P9.21",                // SPI MISO
        "P9.22",                // SPI SCLK
        "spi0";

    fragment@0 {
        target = <&am33xx_pinmux >;
        __overlay__ {
            mux_helper_pins:pins {
                pinctrl-single,pins = < 
                    BONE_P9_12(PIN_INPUT_PULLDOWN | MUX_MODE7)  // dreq IRQ
                    BONE_P9_13(PIN_OUTPUT | MUX_MODE7)          // xreset
                    BONE_P9_14(PIN_OUTPUT | MUX_MODE7)          // cs command
                    BONE_P9_16(PIN_OUTPUT | MUX_MODE7)          // cs data
                    BONE_P9_17(PIN_OUTPUT | MUX_MODE0)          // spi0_cs0.spi0_cs0
                    BONE_P9_18(PIN_OUTPUT | MUX_MODE0)          // spi0_d0.spi0_d1
                    BONE_P9_21(PIN_INPUT_PULLUP | MUX_MODE0)    // spi0_d0.spi0_d0
                    BONE_P9_22(PIN_INPUT_PULLUP | MUX_MODE0)    // spi0_sclk.spi0_sclk
                    >;
            };
        };
    };

// activate mux_helper_pins
    fragment@1 {
        target = <&ocp >;
        __overlay__ {
            test_helper:helper {
                compatible = "bone-pinmux-helper";
                pinctrl-names = "default";
                pinctrl-0 = <&mux_helper_pins >;
                status = "okay";
            };
        };
    };

// spi
    fragment@2 {
        target = <&spi0 >;
        __overlay__ {

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

            spidev@0 {
                spi-max-frequency = <2000000>;
                reg = <0>;
                compatible = "linux,spidev";
            };
        };
    };

// pru
    fragment@3 {
        target = <&pruss >;
        __overlay__ {
            status = "okay";
        };
    };

};