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Linux设备树中MCP2518FD的时钟配置:从0.00MHz到40.00MHz

  • 2026-02-05 00:45:43
Linux设备树中MCP2518FD的时钟配置:从0.00MHz到40.00MHz

📘Linux设备树中MCP2518FD的时钟配置:从0.00MHz到40.00MHz

问题背景

在使用MCP2518FD CAN控制器时,通过dmesg查看驱动初始化日志,发现了一个值得关注的细节:

[    3.207754] mcp251xfd spi0.0 can0: MCP2518FD rev15.15 (-RX_INT -PLL -MAB_NO_WARN +CRC_REG +CRC_RX +CRC_TX +ECC -HD o:0.00MHz c:40.00MHz m:0.60MHz rs:0.60MHz es:0.59MHz rf:0.60MHz ef:0.59MHz) successfully initialized.

注意其中的 o:0.00MHz,这表示驱动检测到的外部晶振(Oscillator)频率为0,而实际硬件使用的是40MHz晶振。这种不匹配可能会导致时钟相关的潜在问题。

时钟参数解读

日志中的时钟相关参数含义如下:

参数
全称
含义
o:
Oscillator
外部晶振频率,驱动识别到的基准时钟源
c:
CAN Clock
CAN控制器内核实际运行时钟
m:
Max SPI
SPI总线最大通信频率
rs:
Requested Speed
设备树中请求的SPI速率
es:
Effective Speed
SPI控制器实际输出的有效速率

当 o:0.00MHz 时,说明驱动没有正确识别外部晶振频率。虽然 c:40.00MHz 显示CAN时钟为40MHz,但这可能是驱动使用的默认值或推测值,而非基于正确的晶振配置计算得出。

为什么会出现o:0.00MHz?

原始设备树配置中使用了 clock-frequency 属性:

&spi0 {
    status = "okay";
// ... 其他配置 ...
    spican0: spican@0 {
        compatible = "microchip,mcp2518fd";
        reg = <0>;
        spi-max-frequency = <100000>;
        interrupts-extended = <&porta 10 IRQ_TYPE_LEVEL_LOW 0>;
        clock-frequency = <40000000>;
    };
};

正确的解决方案

Linux设备树推荐使用 fixed-clock 节点来描述固定频率的时钟源:

// 在根设备树节点 /{ } 中添加
can_osc: can-osc {
    compatible = "fixed-clock";
#clock-cells = <0>;
    clock-frequency = <40000000>;
};

&spi0 {
    status = "okay";
    clocks = <&scmi_clk GATE_LSP0_SSI_M_WCLK_EN>,
             <&scmi_clk GATE_LSP0_SSI_M_PCLK_EN>;
    clock-names = "wclk""pclk";
    resets = <&scmi_reset RST_LSP0_SSI_M_WCLK_SW>;
    reset-names = "spi";
    pinctrl-names = "default";
    pinctrl-0 = <&spi0_pinctrl>;

    spican0: spican@0 {
        compatible = "microchip,mcp2518fd";
        reg = <0>;
        spi-max-frequency = <100000>;
        interrupts-extended = <&porta 10 IRQ_TYPE_LEVEL_LOW 0>;
        clocks = <&can_osc>;  /* 显式引用时钟节点 */
    };
};

关键改进点

  1. 创建独立的时钟节点can_osc 作为一个标准的 fixed-clock 提供者
  2. 显式引用时钟:通过 clocks = <&can_osc> 建立明确的时钟消费关系
  3. 符合设备树规范:这种方式更容易被[[时钟框架]]([[CCF]])正确处理

修改后的效果

重新编译设备树并启动后,dmesg日志应显示:

[    3.207754] mcp251xfd spi0.0 can0: MCP2518FD rev15.15 (...  o:40.00MHz c:40.00MHz ...) successfully initialized.

此时 o: 参数正确显示为 40.00MHz,表明驱动已正确识别外部晶振频率。

为什么这很重要?

虽然在某些场景下,即使 o:0.00MHz 系统也可能表面上正常工作,但正确配置时钟源具有以下重要意义:

  1. 波特率计算准确性:CAN控制器需要基于准确的晶振频率计算位时间参数(Bit Timing)
  2. 时钟同步:确保发送和接收逻辑使用相同的时间基准
  3. 硬件功能完整性:某些高级功能(如时间戳)依赖准确的时钟源
  4. 诊断信息可靠性:准确的时钟信息有助于排查其他问题

总结

在配置MCP2518FD等需要外部晶振的SPI CAN控制器时,应该:

  • ✅ 使用 fixed-clock 节点定义时钟源
  • ✅ 通过 clocks 属性显式引用时钟
  • ✅ 验证dmesg中 o: 参数显示正确频率
  • ❌ 避免直接使用 clock-frequency 属性
  • ❌ 避免注释掉关键配置而不替换

这种规范的配置方式不仅能解决当前问题,还能为后续的功能扩展和问题排查打下良好基础。

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  1. CONNECT:[ UseTime:0.000993s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001487s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000688s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006246s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001379s ]
  6. SELECT * FROM `set` [ RunTime:0.025889s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001307s ]
  8. SELECT * FROM `article` WHERE `id` = 471393 LIMIT 1 [ RunTime:0.018675s ]
  9. UPDATE `article` SET `lasttime` = 1770443038 WHERE `id` = 471393 [ RunTime:0.004628s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000666s ]
  11. SELECT * FROM `article` WHERE `id` < 471393 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003395s ]
  12. SELECT * FROM `article` WHERE `id` > 471393 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001402s ]
  13. SELECT * FROM `article` WHERE `id` < 471393 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018821s ]
  14. SELECT * FROM `article` WHERE `id` < 471393 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.049561s ]
  15. SELECT * FROM `article` WHERE `id` < 471393 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.078931s ]
0.382271s