/*
 * Set up eQEP in a way that does not conflict with HDMI.
 *
 * Copyright (C) 2013  Nathaniel R. Lewis - http://nathanielrlewis.com/
 * Copyright (C) 2018  Antonio Ospite <ao2@ao2.it>
 *
 * This program is free softwarejc 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/dts-v1/;
/plugin/;

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

/ {
	compatible = "ti,beaglebone", "ti,beaglebone-black";

	// Identification.
	part-number = "bbb-eqep2b-ao2";
	version	    = "00A0";

	// Resources this cape uses.
	exclusive-use =
		"P8.12",	// EQEP2A_in
		"P8.11",	// EQEP2B_in
		"P8.16",	// EQEP2_index
		"P8.15",	// EQEP2_strobe

		"eqep2";	// hardware ip used

	fragment@0 {
		target = <&am33xx_pinmux>;
		__overlay__ {
			pinctrl_eqep2: pinctrl_eqep2_pins {
				pinctrl-single,pins = <
					BONE_P8_12 (PIN_INPUT | MUX_MODE4)	// GPIO1_12 = EQEP2A_in
					BONE_P8_11 (PIN_INPUT | MUX_MODE4)	// GPIO1_13 = EQEP2B_in
					BONE_P8_16 (PIN_INPUT | MUX_MODE4)	// GPIO1_14 = EQEP2_index
					BONE_P8_15 (PIN_INPUT | MUX_MODE4)	// GPIO1_15 = EQEP2_strobe
					// From: https://groups.google.com/forum/#!searchin/beagleboard/eQep/beagleboard/Orp3tFcNgCc/mYacP_GkCQQJ
				>;
			};
		};
	};

	fragment@1 {
		target = <&epwmss2>;
		__overlay__ {
			status = "okay";
		};
	};

	fragment@2 {
		target = <&eqep2>;
		__overlay__ {
			pinctrl-names = "default";
			pinctrl-0 = <&pinctrl_eqep2>;

			count_mode = <0>;	// count_mode is not userspace op_mode
			// 0 -> Quadrature mode, normal 90 phase offset cha & chb.
			// 1 -> Direction mode.  cha input = clock, chb input = direction
			// 2 -> UP count mode for frequency measurement QDIR=1, ignore direction input
			// 3 -> DOWN count mode for frequency measurement QDIR=0, ignore direction input

			swap_inputs = <0>;	// swap channel A and B? (0 - no, 1 - yes)
			invert_qa = <1>;	// invert channel A input?
			invert_qb = <1>;	// invert channel B input?
			invert_qi = <0>;	// invert index input?
			invert_qs = <0>;	// invert strobe input?
			omit_interrupt = <0>;	// 1 -> do not install interrupt handler, 0 -> do install

			status = "okay";
		};
	};
};