Re: Testing CAN on Allwinner A20 / Banana Pi

[Patrick Menschel <menschel.p@posteo.de>]

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Hello Marc,

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 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.

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

Thanks and Best Regards,
Patrick





Am 12.09.2015 um 11:13 schrieb Marc Kleine-Budde:
> On 09/12/2015 10:51 AM, Patrick Menschel wrote:
> 
>> I'm new to socketcan and like to test the recent driver for the
>> Allwinner A20 on a BPi.
>>
>> I've got a BPi running CAN4Linux and like to setup a second BPi running
>> socketcan.
> 
> Is your CAN4Linux setup working? It's good to have a working CAN station
> to talk to.
> 
>> I have some basic questions prior to get started with the project:
>>
>> 1.
>> Which kernel version is necessary for the current socketcan?
>> I use the standard linux-sunxi kernel from the repos as this worked well
>> with CAN4Linux.
>> https://github.com/linux-sunxi/linux-sunxi.git
> 
> I'm using mainline linux on my Bpi. Works quite well. I don't use the
> graphics, though.
> 
>> 2.
>> I haven't been able to locate the recent driver on the repos.
>> https://git.kernel.org/cgit/linux/kernel/git/mkl/linux-can-next.git/
>> https://git.kernel.org/cgit/linux/kernel/git/mkl/linux-can.git/
>>
>> Did I miss something, because none of the related commits I see in the
>> mailing list are present in the repo?
> 
> The driver by Gerhard Bertelsmann is still under review, you have to
> apply the patches:
> 
> http://article.gmane.org/gmane.linux.can/8511/raw
> http://article.gmane.org/gmane.linux.can/8512/raw
> 
> to your kernel manually. You have to switch on the CAN driver in you dts
> as documented in patch 8511. Note: When using the patch from the gmane
> archive you have to replace the " <at> " by a "@" sign.
> 
> Marc
> 



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