// this is the example zmatt gave of how to make a pinmux helper
/ {
    my-pinmux-switch {
        compatible = "bone-pinmux-helper";
        pinctrl-names = "default", "foo", "bar";
        pinctrl-0 = <...>;  // pinctrl nodes for the "default" state
        pinctrl-1 = <...>;  // pinctrl nodes for the "foo" state
        pinctrl-2 = <...>;  // pinctrl nodes for the "bar" state
    };
};

// this is the example zmatt gave of doing pinmux
&dra7_pmx_core {
    mcspi3_pins: mcspi3 {
        pinctrl-single,pins = <
            // mcspi3 ioset 6
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 228, PIN_OUTPUT_PULLUP | MUX_MODE1 )  // P17.33  cs1
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 224, PIN_INPUT_PULLUP  | MUX_MODE1 )  // P17.04  clk
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 225, PIN_OUTPUT_PULLUP | MUX_MODE1 )  // P17.07  d1 (mosi)
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 226, PIN_INPUT_PULLUP  | MUX_MODE1 )  // P17.36  d0 (miso)
        >;
    };
};

// putting them together gives (hopefully)

/ {
    my-pinmux-switch {
        compatible = "bone-pinmux-helper";
        pinctrl-names = "default", "foo", "bar";
        pinctrl-0 = <
            // mcspi3 ioset 6
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 228, PIN_OUTPUT_PULLUP | MUX_MODE1 )  // P17.33  cs1
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 224, PIN_INPUT_PULLUP  | MUX_MODE1 )  // P17.04  clk
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 225, PIN_OUTPUT_PULLUP | MUX_MODE1 )  // P17.07  d1 (mosi)
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 226, PIN_INPUT_PULLUP  | MUX_MODE1 )  // P17.36  d0 (miso)
        >;  // pinctrl nodes for the "default" state
        pinctrl-1 = <
            // mcspi3 ioset 6
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 228, PIN_OUTPUT_PULLUP | MUX_MODE2 )  // P17.33  ?
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 224, PIN_INPUT_PULLUP  | MUX_MODE2 )  // P17.04  ?
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 225, PIN_OUTPUT_PULLUP | MUX_MODE2 )  // P17.07  ?
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 226, PIN_INPUT_PULLUP  | MUX_MODE2 )  // P17.36  ?
        >;  // pinctrl nodes for the "foo" state
        pinctrl-2 = <
            // mcspi3 ioset 6
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 228, PIN_OUTPUT_PULLUP | MUX_MODE3 )  // P17.33  ?
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 224, PIN_INPUT_PULLUP  | MUX_MODE3 )  // P17.04  ?
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 225, PIN_OUTPUT_PULLUP | MUX_MODE3 )  // P17.07  ?
            DRA7XX_CORE_IOPAD( 0x3400 + 4 * 226, PIN_INPUT_PULLUP  | MUX_MODE3 )  // P17.36  ?
        >;  // pinctrl nodes for the "bar" state
    };
};