Brooklyn/arch/arm/boot/dts/overlays/mipi-dbi-spi-overlay.dts

/*
 * mipi-dbi-spi-overlay.dts
 */

#include <dt-bindings/gpio/gpio.h>

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835";

	spidev_fragment: fragment@0 {
		target-path = "spi0/spidev@0";
		__overlay__ {
			status = "disabled";
		};
	};

	panel_fragment: fragment@1 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;

			status = "okay";

			panel: panel@0 {
				compatible = "panel", "panel-mipi-dbi-spi";
				reg = <0>;
				spi-max-frequency = <32000000>;

				timing: panel-timing {
					hactive = <320>;
					vactive = <240>;
					hback-porch = <0>;
					vback-porch = <0>;

					clock-frequency = <0>;
					hfront-porch = <0>;
					hsync-len = <0>;
					vfront-porch = <0>;
					vsync-len = <0>;
				};
			};
		};
	};

	fragment@10 {
		target = <&panel>;
		__dormant__  {
			backlight = <&backlight_gpio>;
		};
	};

	fragment@11 {
		target-path = "/";
		__dormant__  {
			backlight_gpio: backlight_gpio {
				compatible = "gpio-backlight";
				gpios = <&gpio 255 GPIO_ACTIVE_HIGH>;
			};
		};
	};

	fragment@20 {
		target = <&panel>;
		__dormant__  {
			backlight = <&backlight_pwm>;
		};
	};

	fragment@21 {
		target-path = "/";
		__dormant__  {
			backlight_pwm: backlight_pwm {
				compatible = "pwm-backlight";
				brightness-levels = <0 6 8 12 16 24 32 40 48 64 96 128 160 192 224 255>;
				default-brightness-level = <16>;
				pwms = <&pwm 0 200000>;
			};
		};
	};

	fragment@22 {
		target = <&pwm>;
		__dormant__ {
			pinctrl-names = "default";
			pinctrl-0 = <&pwm_pins>;
			assigned-clock-rates = <1000000>;
			status = "okay";
		};
	};

	fragment@23 {
		target = <&gpio>;
		__dormant__ {
			pwm_pins: pwm_pins {
				brcm,pins = <18>;
				brcm,function = <2>; /* Alt5 */
			};
		};
	};

	fragment@24 {
		target = <&audio>;
		__dormant__  {
		    brcm,disable-headphones;
		};
	};

	__overrides__ {
		compatible    = <&panel>, "compatible";

		spi0-0        = <&panel_fragment>, "target:0=",<&spi0>,
				<&spidev_fragment>, "target-path=spi0/spidev@0",
				<&panel>, "reg:0=0";
		spi0-1        = <&panel_fragment>, "target:0=",<&spi0>,
				<&spidev_fragment>, "target-path=spi0/spidev@1",
				<&panel>, "reg:0=1";
		spi1-0        = <&panel_fragment>, "target:0=",<&spi1>,
				<&spidev_fragment>, "target-path=spi1/spidev@0",
				<&panel>, "reg:0=0";
		spi1-1        = <&panel_fragment>, "target:0=",<&spi1>,
				<&spidev_fragment>, "target-path=spi1/spidev@1",
				<&panel>, "reg:0=1";
		spi1-2        = <&panel_fragment>, "target:0=",<&spi1>,
				<&spidev_fragment>, "target-path=spi1/spidev@2",
				<&panel>, "reg:0=2";
		spi2-0        = <&panel_fragment>, "target:0=",<&spi2>,
				<&spidev_fragment>, "target-path=spi2/spidev@0",
				<&panel>, "reg:0=0";
		spi2-1        = <&panel_fragment>, "target:0=",<&spi2>,
				<&spidev_fragment>, "target-path=spi2/spidev@1",
				<&panel>, "reg:0=1";
		spi2-2        = <&panel_fragment>, "target:0=",<&spi2>,
				<&spidev_fragment>, "target-path=spi2/spidev@2",
				<&panel>, "reg:0=2";

		speed         = <&panel>, "spi-max-frequency:0";
		cpha          = <&panel>, "spi-cpha?";
		cpol          = <&panel>, "spi-cpol?";

		write-only    = <&panel>, "write-only?";

		width         = <&timing>, "hactive:0";
		height        = <&timing>, "vactive:0";
		x-offset      = <&timing>, "hback-porch:0";
		y-offset      = <&timing>, "vback-porch:0";
		clock-frequency = <&timing>, "clock-frequency:0";

		width-mm      = <&panel>, "width-mm:0";
		height-mm     = <&panel>, "height-mm:0";

		/* optional gpios */
		reset-gpio    = <&panel>, "reset-gpios:0=", <&gpio>,
				<&panel>, "reset-gpios:4",
				<&panel>, "reset-gpios:8=0"; /* GPIO_ACTIVE_HIGH */
		dc-gpio       = <&panel>, "dc-gpios:0=", <&gpio>,
				<&panel>, "dc-gpios:4",
				<&panel>, "dc-gpios:8=0"; /* GPIO_ACTIVE_HIGH */

		backlight-gpio        = <0>, "+10+11",
					<&backlight_gpio>, "gpios:4";
		backlight-pwm         = <0>, "+20+21+22+23+24";
		backlight-pwm-chan    = <&backlight_pwm>, "pwms:4";
		backlight-pwm-gpio    = <&pwm_pins>, "brcm,pins:0";
		backlight-pwm-func    = <&pwm_pins>, "brcm,function:0";
		backlight-def-brightness = <&backlight_pwm>, "default-brightness-level:0";
	};
};