[CAN BUS support orange pi zero]

20 часов назад, Aleksey сказал:

 

Just instead of  

interrupts = <0 7 2>; /* PA7 IRQ_TYPE_EDGE_FALLING */ 
put the correct value  
interrupts = <0 7 IRQ_TYPE_LEVEL_LOW>;    

And everything will work for you including Linux 5.11

 

Just a Linux 5.5 driver, uses sleep functions in the MCP2515, and the IRQ_TYPE_EDGE_FALLING interrupt cannot be handled.

 

 

 

 

Getting compilation error with "interrupts = <0 2 IRQ_TYPE_LEVEL_LOW>;" 

But  when using  " interrupts = <0 2 8>; /* PA2 IRQ_TYPE_LEVEL_LOW */ " (is that what Aleksey meant?) compilation is successfull and  CAN interface is fully functional on Linux 5.10.16-sunxi

 

[CAN BUS support orange pi zero]

17.01.2021 в 19:09, Vadzim Yatskevich сказал:

Can anyone explain strange driver behavior, actual CAN module connection:

MCP2515	Opi Zero H2
INT	PA7
SCK	PA14
SI	PA15
SO	PA16
CS	PA13
GND	GND
5V	5V

 

Either I write in overlay pins = "PA2"; or pins = "PA7"; mcp2515 is successfully initialized

dasio@orangepizero:~$ dmesg | grep mcp
[   11.495643] mcp251x spi0.0 can0: MCP2515 successfully initialized.

But in case of pins = "PA7"; command  "sudo ip link set up can0 type can bitrate 500000" leads system to hang

When in overlay pins = "PA2"; (that does not correspond to physical connection) CAN bus became functional

 

 

  Показать содержимое

/dts-v1/;
/plugin/;

/ {
	compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5";

	fragment@0 {
		target-path = "/clocks";
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <1>;
			can0_osc_fixed: can0_osc_fixed {
				compatible = "fixed-clock";
				#clock-cells = <0>;
				clock-frequency  = <8000000>;
			};
		};
	};

	fragment@1 {
		target = <&pio>;
		__overlay__ {
			can0_pin_irq: can0_pin_irq {
				pins = "PA2";
				function = "irq";
				bias-pull-up;
			};
		};
	};

	fragment@2 {
		target = <&spi1>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";
			mcp2515 {
				reg = <0>;
				compatible = "microchip,mcp2515";
				pinctrl-names = "default";
				pinctrl-0 = <&can0_pin_irq>;
				spi-max-frequency = <10000000>;
				interrupt-parent = <&pio>;
				interrupts = <0 7 2>; /* PA7 IRQ_TYPE_EDGE_FALLING */
				clocks = <&can0_osc_fixed>;
				status = "okay";
			};
		};
	};
};

 

 

So finally I found a dirty solution to have CAN bus on Orange pi Zero and Orange pi Zero plus 2. Downgrade to kernel version Linux 5.4.x (Linux 5.4.58-sunxi in my case) makes interrupt pins behavior completely adequate. Possible to use PA7 (for Orange pi Zero) and PA2 (Orange pi Zero plus 2).

[CAN BUS support orange pi zero]

Can anyone explain strange driver behavior, actual CAN module connection:

MCP2515	Opi Zero H2
INT	PA7
SCK	PA14
SI	PA15
SO	PA16
CS	PA13
GND	GND
5V	5V

 

Either I write in overlay pins = "PA2"; or pins = "PA7"; mcp2515 is successfully initialized

dasio@orangepizero:~$ dmesg | grep mcp
[   11.495643] mcp251x spi0.0 can0: MCP2515 successfully initialized.

But in case of pins = "PA7"; command  "sudo ip link set up can0 type can bitrate 500000" leads system to hang

When in overlay pins = "PA2"; (that does not correspond to physical connection) CAN bus became functional

 

 

Скрытый текст

/dts-v1/;
/plugin/;

/ {
	compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5";

	fragment@0 {
		target-path = "/clocks";
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <1>;
			can0_osc_fixed: can0_osc_fixed {
				compatible = "fixed-clock";
				#clock-cells = <0>;
				clock-frequency  = <8000000>;
			};
		};
	};

	fragment@1 {
		target = <&pio>;
		__overlay__ {
			can0_pin_irq: can0_pin_irq {
				pins = "PA2";
				function = "irq";
				bias-pull-up;
			};
		};
	};

	fragment@2 {
		target = <&spi1>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";
			mcp2515 {
				reg = <0>;
				compatible = "microchip,mcp2515";
				pinctrl-names = "default";
				pinctrl-0 = <&can0_pin_irq>;
				spi-max-frequency = <10000000>;
				interrupt-parent = <&pio>;
				interrupts = <0 7 2>; /* PA7 IRQ_TYPE_EDGE_FALLING */
				clocks = <&can0_osc_fixed>;
				status = "okay";
			};
		};
	};
};