/*********************************************************************
* flexcan controller register
* 说明：
* 由于设备树没有正确注册CAN控制器设备，导致内核没有生产CAN设备。
*
* 2017-8-15 深圳 龙华樟坑村 曾剑锋
********************************************************************/
一、参考文档：
1. device tree can controller status setting
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/net/can/c_can.txt
2. fsl-flexcan.txt
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
二、处理方法：
1. 设备树路径：arch/arm/boot/dts/imx6qdl.dtsi
flexcan1: [email protected]02090000 {
compatible = "fsl,imx6q-flexcan";
reg = <0x02090000 0x4000>;
interrupts = <0 110 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6QDL_CLK_CAN1_IPG>,
<&clks IMX6QDL_CLK_CAN1_SERIAL>;
clock-names = "ipg", "per";
stop-mode = <&gpr 0x34 28 0x10 17>;
status = "okay"; /* change disable to okay */
};
flexcan2: [email protected]02094000 {
compatible = "fsl,imx6q-flexcan";
reg = <0x02094000 0x4000>;
interrupts = <0 111 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6QDL_CLK_CAN2_IPG>,
<&clks IMX6QDL_CLK_CAN2_SERIAL>;
clock-names = "ipg", "per";
stop-mode = <&gpr 0x34 29 0x10 18>;
status = "okay"; /* change disable to okay */
};
2. 查看CAN设备：
[email protected] ~$ ifconfig -a
can0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
NOARP MTU:16 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:142
can1 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
NOARP MTU:16 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:143
...
[email protected] ~$
时间： 2024-08-26 10:29:18