#include "bone/black.h"
#include "gpio.h"

// Since we're creating a virtual device, there's not really a better place to
// put it than root of the device tree.
/ {
        // Node name "gpios" is arbitrary but should not conflict with other
        // nodes or properties in the root of the device tree.
        // To list all of these on a running system:  ls /proc/device-tree/
        magnet-gpios {
                // configure the driver for this device node, which must be "gpio-of-helper"
                compatible = "gpio-of-helper";

                // Attach pinmux node to this device node.  In rare cases devices may have
                // multiple pinmux states, but usually you only have a "default" state.
                pinctrl-names = "default";
                pinctrl-0 = <&gpio_pins>;  //<--- references the "gpio_pins:" label below

                // For each gpio to be setup {

                // The node name "gpio-label" becomes the gpio label and may be arbitrary but
                // must be unique for each gpio (globally, not merely those exported by this
                // gpio-of-helper device).
                magnet_dir {
                        gpio = <
                                &gpio0
                                31
                                ACTIVE_HIGH
                        >;
                        output;                 // initial direction: input or output (optional for outputs)
                        init-low;               // if output, whether it's initially low or initially high
                };
        };
};

// Pinmux nodes must be created inside the pinmux controller, which is &am33xx_pinmux
&am33xx_pinmux {
        // Label "gpio_pins" is arbitrary but must be _globally_ unique among all labels
        // in the device tree (base + overlays), hence it's a good idea to make a bit more
        // verbose than the node name needs to be.  Also, unlike the node name, the label
        // needs to be a valid C identifier (so only alphanumeric and underscores).
        //
        // Node name "gpios" only needs to be unique inside &am33xx_pinmux, so usually
        // it's fine to just use the same name as the device it's for.
        //
        gpio_pins: magnet-gpios {
                pinctrl-single,pins = <
                // {
                        PIN_PULLDN( P9_13, 7:x )
                // }
                >;
        };
};
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