Re: Testing CAN on Allwinner A20 / Banana Pi

[Marc Kleine-Budde <mkl@pengutronix.de>]

On 03/19/2016 01:27 PM, Patrick Menschel wrote:
> you mentioned that you have a running Bpi with mainline kernel.
> 
> My question would be if you're also running mainline u-boot with device
> tree bindings.

I'm running a u-boot, not sure which version.

> I'm now running mainline kernel from stable branch
> compiled with sunxi_defconfig thus CAN driver is built-in and mainline
> u-boot according to
> 
> http://linux-sunxi.org/Mainline_Kernel_Howto
> http://linux-sunxi.org/Mainline_U-boot
> .
> 
> I've added can0 entries manually to
> 
> arch/arm/boot/dts/sun7i-a20.dtsi
> arch/arm/boot/dts/sun7i-a20-bananapi.dts
> 
> since they are missing in the stable branch.
> 
> Compiling to dtb and back to dts now resolves to
> 
> 		can@01c2bc00 {
> 			compatible = "allwinner,sun4i-a10-can";
> 			reg = <0x1c2bc00 0x400>;
> 			interrupts = <0x0 0x1a 0x4>;
> 			clocks = <0x31 0x4>;
> 			status = "okay";
> 			pinctrl-names = "default";
> 			pinctrl-0 = <0x32>;
> 		};
> 
> That does look plausible from my perspective.
> 
> Unfortunately I'm still missing /dev/can0 and have no clue why.

CAN devices are network devices and will not show up in "/dev". Have a
look at:

    ifconfig -a

> If your Bpi works with legacy u-boot, I would try that next.

Marc

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