CAN interface in 3.10.9 kernel

[krishnanp]

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

[fabio_estevam]

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=im...

Regards,

Fabio Estevam

[krishnanp · Accepted solution]

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