如何解决扩展CAN芯片MCP2515的驱动移植问题？

Hi，
我们用在飞凌A40i_C核心板扩展了一路CAN接口，是用SPI2总线连接MCP2515芯片。
我看到内核已经支持该芯片的驱动，但是需要修改内核设备树文件。
飞凌有个2410里面好像用的也是这个扩展芯片，能否提供一下MCP2515驱动设备树文件，或者移植方案。
下面是我们的硬件设计，用的是SPI2，中断管脚是G20_SPI2_CS1

BR.

以下为例子，设备树linux-3.10/arch/arm/boot/dts/sun8iw11p1-OKA40i_C.dts里把cs换成2515就行
&spi2 {
   status = "okay";

   mcp2515_2:mcp2515_2@0 {
               #address-cells=<1>;
               #size-cells=<1>;
               compatible = "microchip,mcp2515_2";
               pinctrl-names = "default";
               reg=<0>;
               spi-max-frequency = <5000000>;
               clocks = <&mcp251x_clock>;
               interrupt-parent = <&pio>;
               interrupts = <27 0>;
   };
/*
   spidev_cs0:spi2_cs0@0{
               #address-cells=<1>;
               #size-cells=<1>;
               compatible = "spidev";
               spi-max-frequency = <1000000>;
               reg             = <0>;
               mode=<0>;
   };
*/
};

阎锐

2022-1-4 10:59:09

您好，MCP2515的设备树配置，有两点不明白，clocks = <&mcp251x_clock>;这个时钟在哪

陈瑞微

2022-1-4 10:59:14

想同时驱动两个mcp2515，设备树这个配置可行吗

      clocks {
            mcp251x_clock:mcp251x_clock{
                     compatible = "fixed-clock";
                     #clock-cells = <0>;
                     clock-frequency = <8000000>;
            };
      };

&spi1 {
   status = "okay";

      mcp2515:mcp2515@0 {
               #address-cells=<1>;
               #size-cells=<1>;
               compatible = "microchip,mcp2515";
                              pinctrl-names = "default";
                              reg=<0>;
               spi-max-frequency = <1000000>;
               clocks = <&mcp251x_clock>;
                              interrupt-parent = <&pio>;
                              interrupts = <8 0>;
      };
};

&spi2 {
   status = "okay";

      mcp2515_1:mcp2515@1 {
               #address-cells=<1>;
               #size-cells=<1>;
               compatible = "microchip,mcp2515";
                              pinctrl-names = "default";
                              reg=<0>;
               spi-max-frequency = <1000000>;
               clocks = <&mcp251x_clock>;
                              interrupt-parent = <&pio>;
                              interrupts = <23 0>;
      };

};

时钟用同一个没问题吧，这样能生成can0和can1吗

2401上做的是两路can，配置如下：
&spi1 {
   status = "okay";

   mcp2515_1:mcp2515_1@0 {
               #address-cells=<1>;
               #size-cells=<1>;
               compatible = "microchip,mcp2515_1";
               pinctrl-names = "default";
               reg=<0>;
               spi-max-frequency = <2000000>;
               clocks = <&mcp251x_clock>;
               interrupt-parent = <&pio>;
               interrupts = <22 0>;
   };
};

&spi2 {
   status = "okay";

   mcp2515_2:mcp2515_2@0 {
               #address-cells=<1>;
               #size-cells=<1>;
               compatible = "microchip,mcp2515_2";
               pinctrl-names = "default";
               reg=<0>;
               spi-max-frequency = <2000000>;
               clocks = <&mcp251x_clock>;
               interrupt-parent = <&pio>;
               interrupts = <27 0>;
   };
/*
   spidev_cs0:spi2_cs0@0{
               #address-cells=<1>;
               #size-cells=<1>;
               compatible = "spidev";
               spi-max-frequency = <1000000>;
               reg             = <0>;
               mode=<0>;
   };

李亮

2022-1-4 10:59:31

interrupts = <27 0>;
这个接收中断指的是哪个管脚，PA27吗？
如果我把中断管脚换成SPI2_CS1 -- PB13应该是哪个数值？

王晾其

回帖（4）

阎锐

陈瑞微

金鼎

李亮

相关问答

RK3288上的can bus芯片MCP2515不能正常使用如何解决

MCP2515是什么？MCP2515协议控制器有哪些功能呢

MCP2515收发数据过程中，不触发中断

基于stm32f103c8t6的有mcp2515的can例程

请问RK3399有飞凌mcp2515模块的驱动么？

MCP2515协议控制器与MCU的连接是如何实现的

与PIC16F877A的CAN接口如何连接MCP2515？

pic16的j1939/mcp2515库文件有吗？

MCP2515错误帧

MCP2515通信问题

20万+工程师都在用，免费PCB检查工具