#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 "magnet-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 = <&magnet_gpio_pins>;  //<--- references the "magnet_gpio_pins:" label below

		// The node name "magnet_dir" 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 "magnet_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 "magnet-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.
	//
	magnet_gpio_pins: magnet-gpios {
		pinctrl-single,pins = <
			PIN_PULLDN( P9_13, 7 )
		>;
	};
};