How can i configure 2 mcp2518 chips on pico mini b?

2025-04-10 3:44

Can you share your final DTS?, i'm still have problems

2025-05-13 20:17

yeisonint wrote: ↑2025-04-10 3:44 Can you share your final DTS?, i'm still have problems

Yes of course.

This is the file "rv1106g-luckfox-pico-pro.dts"

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
 */

/dts-v1/;

#include "rv1106.dtsi"
#include "rv1106-evb.dtsi"
#include "rv1106-luckfox-pico-pro-max-ipc.dtsi"

/ {
	model = "Luckfox Pico Pro";
	compatible = "rockchip,rv1103g-38x38-ipc-v10", "rockchip,rv1106";
};

/**********FLASH**********/
&sfc {
	status = "okay";
	flash@0 {
		compatible = "spi-nand";
		reg = <0>;
		spi-max-frequency = <75000000>;
		spi-rx-bus-width = <4>;
		spi-tx-bus-width = <1>;
	};
};

/**********SDMMC**********/
&sdmmc {
	max-frequency = <50000000>;
	no-sdio;
	no-mmc;
	bus-width = <4>;
	cap-mmc-highspeed;
	cap-sd-highspeed;
	disable-wp;
	pinctrl-names = "default";
	pinctrl-0 = <&sdmmc0_clk &sdmmc0_cmd &sdmmc0_det &sdmmc0_bus4>;
	status = "okay";
};

/**********ETH**********/
&gmac {
	status = "okay";
};

/**********USB**********/
&u2phy {
	status = "okay";
};

&u2phy_otg {
	rockchip,dis-u2-susphy;
	status = "okay";
};

&usbdrd {
	status = "okay";
};

&usbdrd_dwc3 {
	status = "okay";
	dr_mode = "peripheral";
};

/**********SPI**********/
&spi0 {
	status = "okay";
	spidev@0 {
		spi-max-frequency = <50000000>;
	};
  fbtft@0 {
		spi-max-frequency = <50000000>;
  };
};








/**********I2C**********/
/* I2C3_M1 */
&i2c3 {
	status = "disabled";
	clock-frequency = <100000>;
};
/* I2C1_M1 */
&i2c1 {
	status = "disabled";
	clock-frequency = <100000>;
};


/**********UART**********/
/* UART3_M1 */
&uart3 {
	status = "disabled";
};

/* UART4_M1 */
&uart4 {
	status = "disabled";
};

/**********RTC**********/
&rtc {
	status = "okay";
};

And this is the file "rv1106-luckfox-pico-pro-max-ipc.dtsi"

Code: Select all

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
 */
#include "rv1106-amp.dtsi"

/ {
	chosen {
		bootargs = "earlycon=uart8250,mmio32,0xff4c0000 console=ttyFIQ0 root=/dev/mmcblk1p7 rootwait snd_soc_core.prealloc_buffer_size_kbytes=16 coherent_pool=0";
	};

	acodec_sound: acodec-sound {
		compatible = "simple-audio-card";
		simple-audio-card,name = "rv-acodec";
		simple-audio-card,format = "i2s";
		simple-audio-card,mclk-fs = <256>;
		simple-audio-card,cpu {
			sound-dai = <&i2s0_8ch>;
		};
		simple-audio-card,codec {
			sound-dai = <&acodec>;
		};
	};

	vcc_1v8: vcc-1v8 {
		compatible = "regulator-fixed";
		regulator-name = "vcc_1v8";
		regulator-always-on;
		regulator-boot-on;
		regulator-min-microvolt = <1800000>;
		regulator-max-microvolt = <1800000>;
	};

	vcc_3v3: vcc-3v3 {
		compatible = "regulator-fixed";
		regulator-name = "vcc_3v3";
		regulator-always-on;
		regulator-boot-on;
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
	};

	vdd_arm: vdd-arm {
		compatible = "regulator-fixed";
		regulator-name = "vdd_arm";
		regulator-min-microvolt = <800000>;
		regulator-max-microvolt = <1000000>;
		regulator-init-microvolt = <900000>;
		regulator-always-on;
		regulator-boot-on;
	};
	leds: leds {
		compatible = "gpio-leds";
		work_led: work{
			gpios = <&gpio3 RK_PC6 GPIO_ACTIVE_HIGH>;
			linux,default-trigger = "activity";
			default-state = "on";
		};	
	};

	// DHT11
	dht11_sensor {
		compatible = "dht11";
		pinctrl-names = "default";
		pinctrl-0 = <&gpio1_pc7>;
		dht11@1 {
			gpios = <&gpio1 RK_PC7 GPIO_ACTIVE_HIGH>;
			label = "dht11";
			linux,default-trigger = "humidity";
		};
	};


	can0: mcp2515@0 {
		compatible = "microchip,mcp2515";
		reg = <0 0>;
		clocks = <&clk_mcp2515>;
		clock-names = "mcp2515";
		spi-max-frequency = <10000000>;
		interrupt-parent = <&gpio1>;
		interrupts = <RK_PC7 IRQ_TYPE_LEVEL_LOW>;
		vdd-supply = <&vcc_3v3>;
		xceiver-supply = <&vcc_3v3>;
	};

	clk_mcp2515: clk_mcp2515 {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <16000000>;
	};
};

/***************************** AUDIO ********************************/
&i2s0_8ch {
	#sound-dai-cells = <0>;
	status = "okay";
};

&acodec {
	#sound-dai-cells = <0>;
	pa-ctl-gpios = <&gpio1 RK_PA1 GPIO_ACTIVE_HIGH>;
	status = "okay";
};
/***************************** CPU ********************************/
&cpu0 {
	cpu-supply = <&vdd_arm>;
};

/***************************** ADC ********************************/
&saradc {
	status = "okay";
	vref-supply = <&vcc_1v8>;
};

&tsadc {
	status = "okay";
};

/***************************** CSI ********************************/
&csi2_dphy_hw {
	status = "okay";
};

&csi2_dphy0 {
	status = "okay";

	ports {
		#address-cells = <1>;
		#size-cells = <0>;

		port@0 {
			reg = <0>;
			#address-cells = <1>;
			#size-cells = <0>;

			csi_dphy_input0: endpoint@0 {
				reg = <0>;
				remote-endpoint = <&sc3336_out>;
				data-lanes = <1 2>;
			};

			csi_dphy_input1: endpoint@1 {
				reg = <1>;
				remote-endpoint = <&sc4336_out>;
				data-lanes = <1 2>;
			};

			csi_dphy_input2: endpoint@2 {
				reg = <2>;
				remote-endpoint = <&sc530ai_out>;
				data-lanes = <1 2>;
			};
		};

		port@1 {
			reg = <1>;
			#address-cells = <1>;
			#size-cells = <0>;

			csi_dphy_output: endpoint@0 {
				reg = <0>;
				remote-endpoint = <&mipi_csi2_input>;
			};
		};
	};
};

&i2c4 {
	status = "okay";
	clock-frequency = <400000>;
	pinctrl-names = "default";
	pinctrl-0 = <&i2c4m2_xfer>;

	sc3336: sc3336@30 {
		compatible = "smartsens,sc3336";
		status = "okay";
		reg = <0x30>;
		clocks = <&cru MCLK_REF_MIPI0>;
		clock-names = "xvclk";
		pwdn-gpios = <&gpio3 RK_PC5 GPIO_ACTIVE_HIGH>;
		pinctrl-names = "default";
		pinctrl-0 = <&mipi_refclk_out0>;
		rockchip,camera-module-index = <0>;
		rockchip,camera-module-facing = "back";
		rockchip,camera-module-name = "CMK-OT2119-PC1";
		rockchip,camera-module-lens-name = "30IRC-F16";
		port {
			sc3336_out: endpoint {
				remote-endpoint = <&csi_dphy_input0>;
				data-lanes = <1 2>;
			};
		};
	};

	sc4336: sc4336@30 {
		compatible = "smartsens,sc4336";
		status = "okay";
		reg = <0x30>;
		clocks = <&cru MCLK_REF_MIPI0>;
		clock-names = "xvclk";
		pwdn-gpios = <&gpio3 RK_PC5 GPIO_ACTIVE_HIGH>;
		pinctrl-names = "default";
		pinctrl-0 = <&mipi_refclk_out0>;
		rockchip,camera-module-index = <0>;
		rockchip,camera-module-facing = "back";
		rockchip,camera-module-name = "OT01";
		rockchip,camera-module-lens-name = "40IRC_F16";
		port {
			sc4336_out: endpoint {
				remote-endpoint = <&csi_dphy_input1>;
				data-lanes = <1 2>;
			};
		};
	};

	sc530ai: sc530ai@30 {
		compatible = "smartsens,sc530ai";
		status = "okay";
		reg = <0x30>;
		clocks = <&cru MCLK_REF_MIPI0>;
		clock-names = "xvclk";
		pwdn-gpios = <&gpio3 RK_PC5 GPIO_ACTIVE_HIGH>;
		pinctrl-names = "default";
		pinctrl-0 = <&mipi_refclk_out0>;
		rockchip,camera-module-index = <0>;
		rockchip,camera-module-facing = "back";
		rockchip,camera-module-name = "CMK-OT2115-PC1";
		rockchip,camera-module-lens-name = "30IRC-F16";
		port {
			sc530ai_out: endpoint {
				remote-endpoint = <&csi_dphy_input2>;
				data-lanes = <1 2>;
			};
		};
	};
};

&mipi0_csi2 {
	status = "okay";

	ports {
		#address-cells = <1>;
		#size-cells = <0>;

		port@0 {
			reg = <0>;
			#address-cells = <1>;
			#size-cells = <0>;

			mipi_csi2_input: endpoint@1 {
				reg = <1>;
				remote-endpoint = <&csi_dphy_output>;
			};
		};

		port@1 {
			reg = <1>;
			#address-cells = <1>;
			#size-cells = <0>;

			mipi_csi2_output: endpoint@0 {
				reg = <0>;
				remote-endpoint = <&cif_mipi_in>;
			};
		};
	};
};

&rkcif {
	status = "okay";
};

&rkcif_mipi_lvds {
	status = "okay";

	pinctrl-names = "default";
	pinctrl-0 = <&mipi_pins>;
	port {
		/* MIPI CSI-2 endpoint */
		cif_mipi_in: endpoint {
			remote-endpoint = <&mipi_csi2_output>;
		};
	};
};

&rkcif_mipi_lvds_sditf {
	status = "okay";

	port {
		/* MIPI CSI-2 endpoint */
		mipi_lvds_sditf: endpoint {
			remote-endpoint = <&isp_in>;
		};
	};
};

&rkisp {
	status = "okay";
};

&rkisp_vir0 {
	status = "okay";

	port@0 {
		isp_in: endpoint {
			remote-endpoint = <&mipi_lvds_sditf>;
		};
	};
};


/*****************************PINCTRL********************************/
// SPI
&spi0 {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&spi0m0_clk &spi0m0_miso &spi0m0_mosi &spi0m0_cs0>;

	mcp2515@0 {
		compatible = "microchip,mcp2515";
		reg = <0 0>;
		spi-max-frequency = <10000000>;
		interrupts = <RK_PC7 IRQ_TYPE_LEVEL_LOW>;
		interrupt-parent = <&gpio1>;
		clocks = <&clk_mcp2515>;
		clock-names = "mcp2515";
	};
};
// I2C
&i2c0 {
	pinctrl-0 = <&i2c0m2_xfer>;
};

&i2c1 {
	pinctrl-0 = <&i2c1m1_xfer>;
};

&i2c3 {
	pinctrl-0 = <&i2c3m1_xfer &i2c3m0_xfer>;
};

// &i2c4 {
//  pinctrl-0 = <&i2c4m0_xfer>;
// };

// UART
&uart0 {
	pinctrl-0 = <&uart0m0_xfer &uart0m1_xfer>;
};
&uart1 {
	pinctrl-0 = <&uart1m1_xfer>;
};
&uart3 {
	pinctrl-0 = <&uart3m1_xfer>;
};
&uart4 {
	pinctrl-0 = <&uart4m1_xfer>;
};
&uart5 {
	pinctrl-0 = <&uart5m0_xfer>;
};

// PWM
&pwm0 {
	pinctrl-0 = <&pwm0m1_pins>;
};
&pwm2 {
	pinctrl-0 = <&pwm2m2_pins>;
};
&pwm3 {
	pinctrl-0 = <&pwm3m2_pins>;
};
&pwm4 {
	pinctrl-0 = <&pwm4m2_pins>;
};
&pwm5 {
	pinctrl-0 = <&pwm5m2_pins>;
};
&pwm6 {
	pinctrl-0 = <&pwm6m1_pins &pwm6m2_pins>;
};
&pwm8 {
	pinctrl-0 = <&pwm8m1_pins>;
};
&pwm9 {
	pinctrl-0 = <&pwm9m1_pins>;
};
&pwm10 {
	pinctrl-0 = <&pwm10m1_pins &pwm10m2_pins>;
};
&pwm11 {
	pinctrl-0 = <&pwm11m1_pins>;
};

&pinctrl {
	spi0 {
		spi0m0_clk: spi0m0-clk {
			rockchip,pins = <1 RK_PC1 4 &pcfg_pull_none>;
		};
		spi0m0_mosi: spi0m0-mosi {
			rockchip,pins = <1 RK_PC2 6 &pcfg_pull_none>;
		};
		spi0m0_miso: spi0m0-miso {
			rockchip,pins = <1 RK_PC3 6 &pcfg_pull_none>;
		};
		spi0m0_cs0: spi0m0-cs0 {
			rockchip,pins = <1 RK_PC0 4 &pcfg_pull_none>;
		};
	};

    gpio1-pc7 {
        gpio1_pc7:gpio1-pc7 {
            rockchip,pins = <1 RK_PC7 RK_FUNC_GPIO &pcfg_pull_none>;
    };
	};
};

Please pay attention to the settings values. In my case my MCP2515 module is 16mhz. The same with the pins of your luckfox pico pro you are using. Hope it helps

2026-04-08 22:17

Bit late to the party, but here's a guide to run MCP2515_CAN module on Pico mini B...

Prerequisites

I assume you've already build the OS at least once, so the build-system is populated.
I assume you're in the sdk directory.
I also assume you know how to navigate through the menuconfig.

Adding Linux kernel features

Run...
Code: Select all
```
./build.sh kernelconfig
```
to open kernel configuration menu.
Enable "CAN bus subsystem support". Search ("/") for "CAN". I've choosen to build it into the kernel rather than make it a module.
Enable the "Microchip MCP251x and MCP25625 SPI CAN controllers" driver. Search ("/") for "MCP251x".
Save configuration to default path and exit.

Adding OS utils

Run...
Code: Select all
```
./build.sh buildrootconfig
```
to open up buildroot (OS) configuration menu.
Enable building the "can-utils" package. Search ("/") for "CAN_UTILS".
Enable building the "iproute2" package. Search ("/") for "iproute2".

This is required as CAN is full iproute extension, the busybox based "ip" command present by default is stripped of this. Without this you'll get the messages the OP did.
either "dev" is duplicate, or "type" is garbage
Save configuration to default path and exit.

Modifying the Devicetree

We need to modify the Devicetree so the MCP2515 is understood by the driver and to remove "ghost" devices.
Rather than giving you steps here's the diff and full ".dts" file that ended up working for me.
No changes in ".dtsi" files are needed.

Note that I am using the 8Mhz version. If you're using the 16Mhz version modify the "clock-frequency = <8000000>;" line.

Diff:

Code: Select all

diff --git a/sysdrv/source/kernel/arch/arm/boot/dts/rv1103g-luckfox-pico-mini.dts b/sysdrv/source/kernel/arch/arm/boot/dts/rv1103g-luckfox-pico-mini.dts
index 85ce5b81d6f2..88d509272138 100755
--- a/sysdrv/source/kernel/arch/arm/boot/dts/rv1103g-luckfox-pico-mini.dts
+++ b/sysdrv/source/kernel/arch/arm/boot/dts/rv1103g-luckfox-pico-mini.dts
@@ -12,6 +12,13 @@
 / {
 	model = "Luckfox Pico Mini";
 	compatible = "rockchip,rv1103g-38x38-ipc-v10", "rockchip,rv1103";
+
+	/* 8 MHz crystal on the MCP2515 module */
+	clk_mcp2515: clk-mcp2515 {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <8000000>;
+	};
 };
 
 /**********SFC**********/
@@ -34,10 +41,10 @@ &sdmmc {
 	cap-mmc-highspeed;
 	cap-sd-highspeed;
 	disable-wp;
-	
+
 	//sdio
 	cap-sdio-irq;
-	non-removable;	
+	non-removable;
 	no-1-8-v;
 	supports-sdio;
 
@@ -58,11 +65,32 @@ &usbdrd_dwc3 {
 };
 
 /**********SPI**********/
-/* SPI0_M0 */
 &spi0 {
-	status = "disabled";
-	spidev@0 {
-		spi-max-frequency = <50000000>;
+	status = "okay";
+	/delete-node/ spidev@0;
+	/delete-node/ fbtft@0;
+
+	/*
+	* SPI0_M0 — MCP2515 CAN controller (8 MHz module)
+	*
+	* Wiring (Pico Mini B board pin → MCP2515):
+	*   Pin  6  GPIO1_C0 (SPI0_CS0_M0)  → CS
+	*   Pin  7  GPIO1_C1 (SPI0_CLK_M0)  → SCK
+	*   Pin  8  GPIO1_C2 (SPI0_MOSI_M0) → SI
+	*   Pin  9  GPIO1_C3 (SPI0_MISO_M0) → SO
+	*   Pin 18  GPIO0_A4                → INT (active-low)
+	*/
+	mcp2515@0 {
+		compatible = "microchip,mcp2515";
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+		clocks = <&clk_mcp2515>;
+		interrupt-parent = <&gpio0>;
+		interrupts = <RK_PA4 IRQ_TYPE_LEVEL_LOW>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&mcp2515_int>;
+		vdd-supply = <&vcc_3v3>;
+		xceiver-supply = <&vcc_3v3>;
 	};
 };
 
@@ -89,3 +117,13 @@ &uart4 {
 &pwm1 {
 	status = "disabled";
 };
+
+/**********PINCTRL**********/
+&pinctrl {
+	mcp2515 {
+		/* GPIO0_A4 (board pin 18) as active-low interrupt input */
+		mcp2515_int: mcp2515-int {
+			rockchip,pins = <0 RK_PA4 RK_FUNC_GPIO &pcfg_pull_up>;
+		};
+	};
+};

The "sysdrv/source/kernel/arch/arm/boot/dts/rv1103g-luckfox-pico-mini.dts" contents:

Code: Select all

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2023 Luckfox Electronics Co., Ltd.
 */

/dts-v1/;

#include "rv1103.dtsi"
#include "rv1106-evb.dtsi"
#include "rv1103-luckfox-pico-ipc.dtsi"

/ {
	model = "Luckfox Pico Mini";
	compatible = "rockchip,rv1103g-38x38-ipc-v10", "rockchip,rv1103";

	/* 8 MHz crystal on the MCP2515 module */
	clk_mcp2515: clk-mcp2515 {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <8000000>;
	};
};

/**********SFC**********/
&sfc {
	status = "okay";
	flash@0 {
		compatible = "spi-nand";
		reg = <0>;
		spi-max-frequency = <75000000>;
		spi-rx-bus-width = <4>;
		spi-tx-bus-width = <1>;
	};
};

/**********SDMMC**********/
&sdmmc {
	max-frequency = <50000000>;
	no-mmc;
	bus-width = <4>;
	cap-mmc-highspeed;
	cap-sd-highspeed;
	disable-wp;

	//sdio
	cap-sdio-irq;
	non-removable;
	no-1-8-v;
	supports-sdio;

	pinctrl-names = "default";
	pinctrl-0 = <&sdmmc0_clk &sdmmc0_cmd &sdmmc0_det &sdmmc0_bus4>;
	status = "okay";
};

/**********ETH**********/
&gmac {
	status = "disabled";
};

/**********USB**********/
&usbdrd_dwc3 {
	status = "okay";
	dr_mode = "peripheral";
};

/**********SPI**********/
&spi0 {
	status = "okay";
	/delete-node/ spidev@0;
	/delete-node/ fbtft@0;

	/*
	* SPI0_M0 — MCP2515 CAN controller (8 MHz module)
	*
	* Wiring (Pico Mini B board pin → MCP2515):
	*   Pin  6  GPIO1_C0 (SPI0_CS0_M0)  → CS
	*   Pin  7  GPIO1_C1 (SPI0_CLK_M0)  → SCK
	*   Pin  8  GPIO1_C2 (SPI0_MOSI_M0) → SI
	*   Pin  9  GPIO1_C3 (SPI0_MISO_M0) → SO
	*   Pin 18  GPIO0_A4                → INT (active-low)
	*/
	mcp2515@0 {
		compatible = "microchip,mcp2515";
		reg = <0>;
		spi-max-frequency = <10000000>;
		clocks = <&clk_mcp2515>;
		interrupt-parent = <&gpio0>;
		interrupts = <RK_PA4 IRQ_TYPE_LEVEL_LOW>;
		pinctrl-names = "default";
		pinctrl-0 = <&mcp2515_int>;
		vdd-supply = <&vcc_3v3>;
		xceiver-supply = <&vcc_3v3>;
	};
};

/**********I2C**********/
/* I2C3_M1 */
&i2c3 {
	status = "disabled";
	clock-frequency = <100000>;
};

/**********UART**********/
/* UART3_M1 */
&uart3 {
	status = "disabled";
};

/* UART4_M1 */
&uart4 {
	status = "disabled";
};

/**********PWM**********/
/* PWM1_M0 */
&pwm1 {
	status = "disabled";
};

/**********PINCTRL**********/
&pinctrl {
	mcp2515 {
		/* GPIO0_A4 (board pin 18) as active-low interrupt input */
		mcp2515_int: mcp2515-int {
			rockchip,pins = <0 RK_PA4 RK_FUNC_GPIO &pcfg_pull_up>;
		};
	};
};

Connecting the MCP2515_CAN

Pin 2 GND → GND
Pin 3 3V3 (OUT) → VCC
Pin 6 GPIO1_C0 (SPI0_CS0_M0) → CS
Pin 7 GPIO1_C1 (SPI0_CLK_M0) → SCK
Pin 8 GPIO1_C2 (SPI0_MOSI_M0) → SI
Pin 9 GPIO1_C3 (SPI0_MISO_M0) → SO
Pin 18 GPIO0_A4 → INT (active-low)

Building and flashing

Build and flash the built OS the way you always do. Power on the board.
Enure you've got console connection to the board before proceeding with the next step.

Setting it up in the OS

I'm assuming the OS is allready running and you've got console attached.

Run the following command to verify the CAN and driver are working.
Code: Select all
```
dmesg | grep -E 'can|spi|mcp251x'
```
Expected result:
[ 0.186383] can: controller area network core
[ 0.186477] can: raw protocol
[ 0.186490] can: broadcast manager protocol
[ 0.186505] can: netlink gateway - max_hops=1
[ 0.422259] ubi0: scanning is finished
[ 8.172462] ubi4: scanning is finished
[ 9.804153] ubi5: scanning is finished
[ 10.803582] mcp251x spi0.0 can0: bit-timing not yet defined
[ 10.803612] mcp251x spi0.0: unable to set initial baudrate!
Run the following command block to set-up CAN:
Code: Select all
```
ip link set can0 type can bitrate 500000 && \
ip link set can0 up && \
echo "Success!"
```
If succeeded "Success!" will be printed last.
Verify the CAN network is up. Run the following command:
Code: Select all
```
ip -details link show can0
```
Expected result:
2: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP mode DEFAULT group default qlen 10
link/can promiscuity 0 minmtu 0 maxmtu 0
can state ERROR-ACTIVE restart-ms 0
bitrate 500000 sample-point 0.750
tq 250 prop-seg 2 phase-seg1 3 phase-seg2 2 sjw 1 brp 1
mcp251x: tseg1 3..16 tseg2 2..8 sjw 1..4 brp 1..64 brp_inc 1
clock 4000000 numtxqueues 1 gso_max_size 65536 gso_max_segs 65535