TX2 R28.2.1 porting mcp2515

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hi,

I’m trying to port mcp2515 on our TX2 custom board through SPI0.
Here is the code I added.

diff --git a/sources/hardware/nvidia/platform/t18x/common/kernel-dts/t18x-common-platforms/tegra186-cvb-prod-p2597-b00-p3310-1000-a00-00.dtsi b/sources/hardware/nvidia/platform/t18x/common/kernel-dts/t18x-common-platforms/tegra186-cvb-prod-p2597-b00-p3310-1000-a00-00.dtsi
index 972d701..8f34195 100644
--- a/sources/hardware/nvidia/platform/t18x/common/kernel-dts/t18x-common-platforms/tegra186-cvb-prod-p2597-b00-p3310-1000-a00-00.dtsi
+++ b/sources/hardware/nvidia/platform/t18x/common/kernel-dts/t18x-common-platforms/tegra186-cvb-prod-p2597-b00-p3310-1000-a00-00.dtsi
@@ -19,6 +19,20 @@
 
 / { 
+	spi@c260000 {
+		can2: can@0 {
+			compatible = "microchip,mcp2515";
+			reg = <1>;
+			spi-max-frequency = <10000000>;
+		};
+	};
 	i2c@3160000 {
 		ina3221x@42 {
 			compatible = "ti,ina3221x";

I also enable CONFIG_CAN_MCP251X=y
But I got an error message “mcp251x: probe of spi1.1 failed with error -2”
Does anyone know how to port mcp2515?

Thx
Yen

2

Hi,

I saw someone said that mcp2515 driver only supports TX1(Auvidea J120 · Issue #38 · NVIDIA-AI-IOT/redtail · GitHub)
Is it true?

Thx
Yen

3

Hi nvidia guys,

Anyone can help?

Thx
Yen

4

hello yenchao,

please check [Tegra X2 (Parker Series SoC) Technical Reference Manual] from Jetson Download Center
you could also refer to Topic 1037624 for more details.
thanks

5

Hi,

I can confirm mcp251x driver is working on TX2. Please be aware that SPI0 on dev board actually is SPI4 in software. See pinmux xls for details

6

Hi,

I’m still working on TX2 mcp2515.
Please see the code I added as below.

+       clocks {
+               /* 16MHz external crystal oscillator */
+               canclk: mcp251x_osc {
+                       #clock-cells = <0>;
+                       compatible = "fixed-clock";
+                       clock-frequency = <20000000>;
+               };
+       };
+
+       spi@c260000 {
+        status = "okay";
+               spi-max-frequency = <2000000>;
+               spi-touch-sharp19x12@0 {
+                               status = "disabled";
+               };
+
+               can2: can@0 {
+                       status = "okay";
+                   compatible = "microchip,mcp2515";
+                       spi-max-frequency = <2000000>;
+                   reg = <0>;
+                       interrupt-parent = <&tegra_aon_gpio>;
+                       interrupts = <TEGRA_AON_GPIO(AA, 2) 0x01>;
+                       clocks = <&canclk>;
+               };
+       };
+////

Current situation is mcp2515 could send CAN MESSAGE, but only send one time.
I need to run “sudo ip link set down can2” and “sudo ip link set up can2” to send another CAN MESSAGE.
After sending CAN MESSAGE, I found some registers had changed.
CANSTAT:from 0 to 6
CANINTF:from 0 to 4

I also had tried to set CANSTAT and CANINTF to 0 after sending CAN MESSAGE, but it didn’t work.

Any advice and suggestions would be greatly appreciated.

Thx
Yen