CORRECTED SPI0_SPIDEV dts.

gistfile1.txt

/*
 * Copyright (C) 2013 Ian McMahon <[email protected]>
 *
 * Virtual cape enabling SPIDEV on 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-SPI0_SPIDEV";
   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>;

         spi0_0 {
            #address-cells       = <1>;
            #size-cells       = <0>;
            compatible     = "linux,spidev";
            reg         = <0>; /* CS value for this device (BB has only CS0 broken out for SPI0, so only one device is possible) */
            spi-max-frequency = <16000000>;

            // set cpol and cpha as necessary.  Default is neither, which is mode 0.
            // spi-cpol;
            // spi-cpha;
         };
      };
   };
};