This is similar to 20230710 - Enable CAN on MangoPi, but I was not able to finish it.

• Linux example and docs of the overlay
• Another example of how to implement it
• People adding the CAN Controller on OrangePi

Connections

In the board the is silkscreen to say what is the pin 1 of the SPI interface.

Get the SPI reg

$/sys/class/spi_master# ls
spi0

Overlay

/dts-v1/;
/plugin/;

/ {
	compatible = "allwinner,d1-nezha\0allwinner,sun20i-d1";

	fragment@0 {
		target-path = "/";
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <1>;
            /* External crystal oscillator on the board */
			can0_osc_fixed: can0_osc_fixed {
				compatible = "fixed-clock";
				#clock-cells = <0>;
				clock-frequency  = <8000000>;
                phandle = <0x81>;
			};
		};
	};

	fragment@1 {
		target = <0x23>; // pinctrl@2000000
		__overlay__ {
			can0_pin_irq: can0_pin_irq {
				pins = "PC1";
				function = "irq";
				phandle = <0x85>;
			};
		};
	};

	fragment@2 {
		target = <&spi@4026000>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";
			mcp2515 {
				reg = <0>;
				compatible = "microchip,mcp2515";
				pinctrl-names = "default";
				pinctrl-0 = <0x85>;
				spi-max-frequency = <10000000>;
				interrupt-parent = <0x24>; // pinctrl@2000000
                interrupts = <0x85 0x04>; // IRQ LINE
				clocks = <0x81>;
				status = "okay";
			};
		};
	};
};