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Linux设备树寄存器资源获取

  • 2026-06-30 05:33:01
Linux设备树寄存器资源获取

Linux设备树寄存器资源获取

设备树简介
设备树(Device Tree)是一种描述硬件资源的数据结构，用于将硬件配置信息从内核代码中分离出来。
在Linux驱动开发中，我们通过设备树获取硬件寄存器地址、中断号、时钟等资源，使驱动更具可移植性。
设备树源文件(.dts)编译后生成设备树二进制文件(.dtb)，由Bootloader传递给内核。

关键API函数
Linux内核提供了一系列API函数用于从设备树获取资源：
platform_get_resource() - 获取内存、I/O或中断资源
devm_ioremap_resource() - 映射物理地址到虚拟地址空间
of_iomap() - 直接映射设备树节点中的寄存器
of_address_to_resource() - 转换设备树地址为资源结构
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  1. CONNECT:[ UseTime:0.000487s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000600s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008930s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003399s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000633s ]
  6. SELECT * FROM `set` [ RunTime:0.000405s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000720s ]
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  9. UPDATE `article` SET `lasttime` = 1783155387 WHERE `id` = 489925 [ RunTime:0.014788s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000337s ]
  11. SELECT * FROM `article` WHERE `id` < 489925 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008495s ]
  12. SELECT * FROM `article` WHERE `id` > 489925 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006033s ]
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  14. SELECT * FROM `article` WHERE `id` < 489925 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.028068s ]
  15. SELECT * FROM `article` WHERE `id` < 489925 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.032326s ]
0.183710s