rpi-epd-overlay.dts

/*
 * Device Tree overlay for epd module for raspberry-pi
 */

/dts-v1/;
/plugin/; /* allow undefined label references */

/ {
	compatible = "brcm,bcm2835", "bcrm,bcm2708";

	/* enable pwm */
	fragment@0 {
		target = <&soc>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <1>;
			pwm: pwm@7e20c000 {
				compatible = "brcm,bcm2835-pwm";
				reg = <0x7e20c000 0x28>;
				clocks = <&clk_pwm>;
				#pwm-cells = <2>;
				status = "okay";
				pinctrl-names = "default";
				pinctrl-0 = <&gpiopwm>;
			};
		};
	};

	/* configure pwm gpios */
	fragment@1 {
		target = <&gpio>;
		__overlay__ {
			gpiopwm: pwm {
				brcm,pins = <18>;
				brcm,function = <2>;
			};
		};
	};

	/* disable spidev and add enable epd driver */
	fragment@2 {
		target = <&spi0>;
		__overlay__ {
			status = "okay";
			#address-cells = <1>;
			#size-cells = <0>;
			spidev@0 {
				status = "disabled";
			};
			epd@0{
				compatible = "prvdsp,g1-epd";
				reg = <0>;
				#address-cells = <1>;
				#size-cells = <0>;
				spi-max-frequency = <12000000>;
				status = "okay";
				pwms = <&pwm  0 5000000>;
				panel_on-gpios = <&gpio 22 0>;
				reset-gpios = <&gpio 24 0>;
				border-gpios = <&gpio 14 0>;
				busy-gpios = <&gpio 17 0>;
				discharge-gpios = <&gpio 23 0>;
			};
		};
	};

	/* enable i2c */
	fragment@3 {
		target = <&i2c0>;
		__overlay__ {
			status = "okay";
		};
	};

	/* enable i2c */
	fragment@4 {
		target = <&i2c1>;
		__overlay__ {
			status = "okay";
		};
	};

	/* enable i2c */
	fragment@5 {
		target = <&i2c2>;
		__overlay__ {
			status = "okay";
		};
	};
};