meta-rpi-diya/recipes-bsp/waveshare-2.8-lcd/files/dts/vc4-kms-waveshare-28dpi.dts

/*
 * vc4-kms-waveshare-28dpi-overlay.dts
 */

/dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/pinctrl/bcm2835.h>

/ {
	compatible = "brcm,bcm2835";
	fragment@0 {
		target = <&gpio>;
		__overlay__ {
			pwm_pins: pwm_pins {
				brcm,pins = <18>;
				brcm,function = <BCM2835_FSEL_ALT5>;
				brcm,pull = <0>;
			};
		};
	};

	fragment@1 {
		target = <&pwm>;
		frag1: __overlay__ {
			pinctrl-names = "default";
			pinctrl-0 = <&pwm_pins>;
			assigned-clock-rates = <100000000>;
			status = "okay";
		};
	};

	fragment@2 {
		target-path = "/";
		__overlay__ {
			//#gpio-cells = <2>;
			/* Panel backlight through PWM0_0 on GPIO18 */
			backlight_lvds: backlight {
				compatible = "pwm-backlight";
				pwms = <&pwm 0 10000000>;
				brightness-levels = <0 1000>;
				num-interpolated-steps = <1000>;
				default-brightness-level = <1000>;
			};

			panel: panel {
				reg = <0>;
				compatible = "panel-dpi";
				backlight = <&backlight_lvds>;

				width-mm = <154>;
				height-mm = <86>;
				bus-format = <0x1015>;

				timing: panel-timing {
					clock-frequency = <28000000>;
					hactive = <480>;
					hfront-porch = <26>;
					hsync-len = <16>;
					hback-porch = <10>;
					hsync-active = <0>;
					vactive = <640>;
					vfront-porch = <25>;
					vsync-len = <10>;
					vback-porch = <16>;
					vsync-active = <0>;

					de-active = <1>;
					pixelclk-active = <1>;
				};

				port {
					panel_in: endpoint {
						remote-endpoint = <&dpi_out>;
					};
				};
			};
		};
	};

	fragment@3 {
		target = <&dpi>;
		dpi_node: __overlay__  {
			status = "okay";

			pinctrl-names = "default";
			
			/* refer to /home/pi/linux/arch/arm/boot/dts/bcm270x.dtsi
			 * for the pin multiplex setting
			 */
			pinctrl-0 = <&dpi_18bit_cpadhi_gpio0>;

			port {
				dpi_out: endpoint {
					remote-endpoint = <&panel_in>;
				};
			};
		};
	};
};