i.MX ProcessorsのトピックRe: CAN interface in 3.10.9 kernel

CAN interface in 3.10.9 kernel

krishnanp — Thu, 30 Jan 2014 11:01:55 GMT

Hello all,

Last week i was working on enabling CAN interface on i.MX6 solo based board. I am able to bring up the CAN interface with necessary changes in dts file

In imx6qdl.dtsi added clocks of nodes.

can1: flexcan@02090000 {

compatible = "fsl,imx6q-flexcan";

reg = <0x02090000 0x4000>;

interrupts = <0 110 0x04>;

clocks = <&clks 108>, <&clks 109>;

clock-names = "ipg", "per";

};

can2: flexcan@02094000 {

compatible = "fsl,imx6q-flexcan";

reg = <0x02094000 0x4000>;

interrupts = <0 111 0x04>;

clocks = <&clks 110>, <&clks 111>;

clock-names = "ipg", "per";

};

In my board dts file I have added

&can1 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_flexcan1_1>;

status = "okay";

};

I am able to see the can interface up and also able to set the bit rate. But the board is not sending any CAN frames outside.

Finally I found there is mismatch in the CAN root clock configuration. Later I found a link tells about the same issue and and solution.

http://patchwork.openwrt.org/patch/4531/

Hope this helps for those who enable CAN on 3.10.9 kernel on i.MX6

Krishnan

Re: CAN interface in 3.10.9 kernel

krishnanp — Thu, 30 Jan 2014 11:38:10 GMT

Following commands will be usefull in testing the CAN

Show the link status

--------------------

ip -details -statistics link show can0

Set bitrate example

-----------

ip link set can0 up type can bitrate 125000

ip link set can0 up type can bitrate 500000

ip link set can0 up type can bitrate 50000

----or---

canconfig can0 bitrate 125000

Send can frames

---------------

cansend can0 111#1122334455667788

---Or---

cansend can0 -i 0x10 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88

Re: CAN interface in 3.10.9 kernel

fabio_estevam — Thu, 30 Jan 2014 17:18:47 GMT

FYI , the flexcan nodes are already avaliable at the dtsi from 3.10.17:

http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/boot/dts/imx6qdl.dtsi?h=imx_3.10.17_1.0.0_beta

Regards,

Fabio Estevam