BB-I2C1-PCA9685-00A0.dts

/*
 * Copyright (C) 2015 Robert Nelson <robertcnelson@gmail.com>
 *
 * 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/;

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

/ {
	/*
	 * Helper to show loaded overlays under: /proc/device-tree/chosen/overlays/
	 */
	fragment@0 {
		target-path="/";
		__overlay__ {

			chosen {
				overlays {
					BB-I2C1-PCA9685-00A0 = __TIMESTAMP__;
				};
			};
		};
	};

	/*
	 * Free up the pins used by the cape from the pinmux helpers.
	 */
	fragment@1 {
		target = <&ocp>;
		__overlay__ {
			P9_17_pinmux { status = "disabled"; };	/* i2c1_scl */
			P9_18_pinmux { status = "disabled"; };	/* i2c1_sda */
			P9_23_pinmux { status = "disabled"; };	/* gpio1_17 */
			P9_27_pinmux { status = "disabled"; };	/* gpio3_19 */
		};
	};

	fragment@2 {
		target = <&am33xx_pinmux>;
		__overlay__ {

			bb_pca9685_oe0_pins: pinmux_bb_pca9685_oe0_pins {
				pinctrl-single,pins = <
					BONE_P9_23 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* gpmc_a1.gpio1_17 */
					BONE_P9_27 (PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* mcasp0_fsr.gpio3_19 */
				>;
			};

			bb_i2c1_pins: pinmux_bb_i2c1_pins {
				pinctrl-single,pins = <
					BONE_P9_18 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP | MUX_MODE2) /* spi0_d1.i2c1_sda */
					BONE_P9_17 (SLEWCTRL_SLOW | PIN_INPUT_PULLUP | MUX_MODE2) /* spi0_cs0.i2c1_scl */
				>;
			};
		};
	};

	fragment@3 {
		target-path="/";
		__overlay__ {

			leds {
				pinctrl-names = "default";
				pinctrl-0 = <&bb_pca9685_oe0_pins>;

				compatible = "gpio-leds";

				pca9685-oe@0 {
					label = "pca9685-oe0";
					gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;
					default-state = "on";
				};

				pca9685-oe@1 {
					label = "pca9685-oe1";
					gpios = <&gpio3 19 GPIO_ACTIVE_HIGH>;
					default-state = "on";
				};
			};
		};
	};

	fragment@4 {
		target = <&i2c1>;
		__overlay__ {
			status = "okay";
			pinctrl-names = "default";
			pinctrl-0 = <&bb_i2c1_pins>;

			/* this is the configuration part */
			clock-frequency = <100000>;

			#address-cells = <1>;
			#size-cells = <0>;

			/* pca9685 pwm module 0 */
			pca@40 {
				compatible = "nxp,pca9685-pwm";
				#pwm-cells = <2>;
				reg = <0x40>;
				/* invert; */
				/* open-drain; */
			};

			/* pca9685 pwm module 1 */
			pca@41 {
				compatible = "nxp,pca9685-pwm";
				#pwm-cells = <2>;
				reg = <0x41>;
				/* invert; */
				/* open-drain; */
			};
		};
	};
};