import RT-Thread@9217865c without bsp, libcpu and components/net
This commit is contained in:
Zihao Yu
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components/drivers/fdt/docs/README.md
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components/drivers/fdt/docs/README.md
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# 文档
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## 软件包地址
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- https://gitee.com/GuEe_GUI/fdt
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## 文档列表
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|文件名 |描述|
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|:----- |:----|
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|[examples.md](examples.md) |示例程序|
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|[version.md](version.md) |版本信息|
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|[api.md](api.md) |API 说明|
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434
components/drivers/fdt/docs/api.md
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434
components/drivers/fdt/docs/api.md
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# fdt load API
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## 从文件系统上读取设备树
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```c
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void *fdt_load_from_fs(char *dtb_filename)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_filename | 设备树文件名 |
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| **返回** | **描述** |
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|void* | 设备树在内存上的地址 |
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## 从内存上读取设备树
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```c
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void *fdt_load_from_memory(void *dtb_ptr, rt_bool_t is_clone)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_ptr | 设备树在内存上的内存地址 |
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|is_clone | 是否克隆到新的内存区域 |
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| **返回** | **描述** |
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|void* | 设备树在内存上的地址 |
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# fdt set API
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## 设置Linux启动参数
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```c
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rt_size_t fdt_set_linux_cmdline(void *fdt, char *cmdline)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|fdt | 设备树指针 |
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|cmdline | 启动参数 |
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| **返回** | **描述** |
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|rt_size_t | 修改设备树后设备树的大小 |
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## 设置Linux init ramdisk
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```c
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rt_size_t fdt_set_linux_initrd(void *fdt, rt_uint64_t initrd_addr, rt_size_t initrd_size)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|fdt | 设备树指针 |
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|initrd_addr | init ramdisk 内存地址 |
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|initrd_size | init 大小 |
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| **返回** | **描述** |
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|rt_size_t | 修改设备树后设备树的大小 |
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## 设置节点属性值
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```c
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rt_size_t fdt_set_dtb_property(void *fdt, char *pathname, char *property_name, rt_uint32_t *cells, rt_size_t cells_size);
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|fdt | 设备树指针 |
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|pathname | 节点路径 |
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|property_name | 属性名称 |
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|cells | 属性值地址 |
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|cells_size | 属性值长度 |
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| **返回** | **描述** |
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|rt_size_t | 修改设备树后设备树的大小 |
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## 添加保留内存
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```c
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rt_size_t fdt_add_dtb_memreserve(void *fdt, rt_uint64_t address, rt_uint64_t size)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|fdt | 设备树指针 |
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|address | 保留内存起始地址 |
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|size | 保留内存大小 |
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| **返回** | **描述** |
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|rt_size_t | 修改设备树后设备树的大小 |
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## 删除保留内存
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```c
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rt_size_t fdt_del_dtb_memreserve(void *fdt, rt_uint64_t address)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|fdt | 设备树指针 |
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|address | 保留内存起始地址 |
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| **返回** | **描述** |
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|rt_size_t | 修改设备树后设备树的大小 |
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# fdt get API
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## 获取设备树软件包执行状态
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```c
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rt_err_t fdt_get_exec_status()
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|无 | 无参数 |
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| **返回** | **描述** |
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|FDT_RET_NO_MEMORY | 内存不足 |
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|FDT_RET_NO_LOADED | 设备树还未加载进内存 |
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|FDT_RET_GET_OK | 执行成功 |
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|FDT_RET_GET_EMPTY | 读取数据为空 |
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## 将原始设备树转换为设备节点树
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```c
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struct dtb_node *fdt_get_dtb_list(void *fdt)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|fdt | 设备树在内存上的地址 |
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| **返回** | **描述** |
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|struct dtb_node * | 设备节点树头指针 |
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## 释放设备节点树内存
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```c
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void fdt_free_dtb_list(struct dtb_node *dtb_node_head)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node_head | 设备节点树头节点 |
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| **返回** | **描述** |
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|无返回值 | 无描述 |
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示例：加载设备树
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```c
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#include <rtthread.h>
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#include <fdt.h>
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int main()
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{
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void *fdt = fdt_load_from_fs("sample.dtb");
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if (fdt != RT_NULL)
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{
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struct dtb_node *dtb_node_list = fdt_get_dtb_list(fdt);
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if (dtb_node_list != RT_NULL)
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{
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/* load dtb node list OK */
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/* free dtb_node_list here */
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fdt_free_dtb_list(dtb_node_list);
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}
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rt_free(fdt);
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}
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return 0;
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}
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```
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## 打印设备树信息
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```c
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void fdt_get_dts_dump(struct dtb_node *dtb_node_head)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node_head | 设备节点树头节点 |
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| **返回** | **描述** |
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|无返回值 | 无描述 |
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## 遍历设备节点树并使用程序定义的回调函数
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```c
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void fdt_get_enum_dtb_node(struct dtb_node *dtb_node_head, void (*callback(struct dtb_node *dtb_node)))
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node_head | 设备节点树头节点 |
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|callback | 程序定义的回调函数 |
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| **返回** | **描述** |
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|无返回值 | 无描述 |
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示例：遍历设备树节点，并打印每个节点名称
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```c
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#include <rtthread.h>
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#include <fdt.h>
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void callback(struct dtb_node *node)
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{
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rt_kprintf("this node's name is %s\n", node->name);
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}
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int main()
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{
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/* loaded dtb_node */
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extern struct dtb_node *dtb_node_list;
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if (dtb_node_list != RT_NULL)
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{
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fdt_get_enum_dtb_node(dtb_node_list, callback);
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}
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return 0;
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}
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```
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## 通过节点名称查找节点
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```c
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struct dtb_node *fdt_get_dtb_node_by_name_DFS(struct dtb_node *dtb_node, const char *nodename)
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```
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```c
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struct dtb_node *fdt_get_dtb_node_by_name_BFS(struct dtb_node *dtb_node, const char *nodename)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node | 设备节点树节点 |
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|nodename | 查找节点的名称 |
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| **返回** | **描述** |
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|struct dtb_node * | 返回查找的节点 |
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|RT_NULL | 未找到为RT_NULL |
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## 通过节点路径查找节点
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```c
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struct dtb_node *fdt_get_dtb_node_by_path(struct dtb_node *dtb_node, const char *pathname)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node | 设备节点树节点 |
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|pathname | 查找节点的路径 |
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| **返回** | **描述** |
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|struct dtb_node * | 返回查找的节点 |
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|RT_NULL | 未找到为RT_NULL |
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## 通过节点phandle值查找节点
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```c
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struct dtb_node *fdt_get_dtb_node_by_phandle_DFS(struct dtb_node *dtb_node, phandle handle)
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```
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```c
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struct dtb_node *fdt_get_dtb_node_by_phandle_BFS(struct dtb_node *dtb_node, phandle handle)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node | 设备节点树节点 |
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|handle | 查找节点的phandle值 |
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| **返回** | **描述** |
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|struct dtb_node * | 返回查找的节点 |
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|RT_NULL | 未找到为RT_NULL |
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DFS和BFS是用于区分不同深度节点的搜索方法，时间复杂度和空间复杂度都较高，建议使用路径查找。
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## 读取节点属性值的单位
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```c
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void fdt_get_dtb_node_cells(struct dtb_node *dtb_node, int *addr_cells, int *size_cells)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node | 设备节点树节点 |
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|addr_cells | 返回的地址块的单位（u32）大小 |
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|size_cells | 返回的尺寸块的单位（u32）大小 |
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| **返回** | **描述** |
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|无返回值 | 无描述 |
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## 读取节点属性值
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```c
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void *fdt_get_dtb_node_property(struct dtb_node *dtb_node, const char *property_name, rt_size_t *property_size)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node | 设备节点树节点 |
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|property_name | 属性名称 |
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|property_size | 属性大小 |
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| **返回** | **描述** |
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|void * | 无描述 |
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|RT_NULL | 该设备树没有该属性 |
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读取的值为在设备树中存储的值，CPU小端模式下可能需要使用其他API进行转换才是正确的值
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## 读取预留内存信息
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```c
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struct dtb_memreserve *fdt_get_dtb_memreserve(struct dtb_node *dtb_node, int *memreserve_size)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node | 设备节点树节点 |
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|memreserve_size | 返回的内存信息数组长度 |
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| **返回** | **描述** |
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|struct dtb_memreserve *| 内存预留信息数组的内存地址 |
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|RT_NULL | 该设备树没有预留内存信息 |
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## 读取节点的状态
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```c
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rt_bool_t fdt_get_dtb_node_status(struct dtb_node *dtb_node)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node | 设备节点树节点 |
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| **返回** | **描述** |
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|RT_FALSE | 状态为禁用 |
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|RT_TRUE | 状态为使用 |
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## 用于参数为字符串列表的函数
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```c
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fdt_string_list(string, ...)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|string | 字符串集合 |
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## 读取节点compatible标志匹配
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```c
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rt_bool_t fdt_get_dtb_node_compatible_match(struct dtb_node *dtb_node, char **compatibles)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|dtb_node | 设备节点树节点 |
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|compatibles | 所有要匹配的字符串列表 |
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| **返回** | **描述** |
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|RT_FALSE | 匹配失败 |
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|RT_TRUE | 匹配成功 |
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## 读取属性值中的字符串
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```c
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char *fdt_get_dtb_string_list_value(void *value, int size, int index)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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|value | 节点属性的内存地址 |
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|size | 节点属性的尺寸 |
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|index | 要读取字符串的索引 |
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| **返回** | **描述** |
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|char * | 字符串的内存地址 |
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|RT_NULL | 该索引没有字符串 |
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## 读取值为字符串属性下一个字符串
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```c
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char *fdt_get_dtb_string_list_value_next(void *value, void *end)
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```
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| 参数 | 描述 |
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|:------------------|:------------------------------------|
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||||
|value | 节点属性的内存地址 |
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|end | 节点属性的结束地址 |
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| **返回** | **描述** |
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|char * | 字符串的内存地址 |
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|RT_NULL | 没有下一个字符串 |
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## 读取值为u32属性的值
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```c
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rt_uint32_t fdt_get_dtb_cell_value(void *value)
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```
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| 参数 | 描述 |
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||||
|:------------------|:------------------------------------|
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||||
|value | 节点属性的内存地址 |
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| **返回** | **描述** |
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|rt_uint32_t | 该值小端的值 |
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## 读取值为u8属性的值
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```c
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rt_uint8_t fdt_get_dtb_byte_value(void *value)
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```
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||||
| 参数 | 描述 |
|
||||
|:------------------|:------------------------------------|
|
||||
|value | 节点属性的内存地址 |
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||||
| **返回** | **描述** |
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||||
|rt_uint8_t | 该值小端的值 |
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# fdt foreach API
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||||
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## 遍历属性中字符串宏
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||||
```c
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for_each_property_string(node_ptr, property_name, str, size)
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||||
```
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||||
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||||
| 参数 | 描述 |
|
||||
|:------------------|:------------------------------------|
|
||||
|node_ptr | 设备节点树节点 |
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||||
|property_name | 节点属性名称 |
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||||
|str | 每次遍历到的字符串 |
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||||
|size | 用于保存节点属性的尺寸 |
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||||
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||||
## 遍历属性中u32宏
|
||||
```c
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||||
for_each_property_cell(node_ptr, property_name, value, list, size)
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||||
```
|
||||
|
||||
| 参数 | 描述 |
|
||||
|:------------------|:------------------------------------|
|
||||
|node_ptr | 设备节点树节点 |
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||||
|property_name | 节点属性名称 |
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||||
|value | 每次遍历到的值 |
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||||
|list | 用于保存节点属性的值内存地址 |
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||||
|size | 用于保存节点属性的尺寸 |
|
||||
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||||
## 遍历属性中u8宏
|
||||
```c
|
||||
for_each_property_byte(node_ptr, property_name, value, list, size)
|
||||
```
|
||||
|
||||
| 参数 | 描述 |
|
||||
|:------------------|:------------------------------------|
|
||||
|node_ptr | 设备节点树节点 |
|
||||
|property_name | 节点属性名称 |
|
||||
|value | 每次遍历到的值 |
|
||||
|list | 用于保存节点属性的值内存地址 |
|
||||
|size | 用于保存节点属性的尺寸 |
|
||||
|
||||
## 遍历子节点宏
|
||||
```c
|
||||
for_each_node_child(node_ptr)
|
||||
```
|
||||
|
||||
| 参数 | 描述 |
|
||||
|:------------------|:------------------------------------|
|
||||
|node_ptr | 设备节点树节点 |
|
||||
|
||||
## 遍历兄弟节点宏
|
||||
```c
|
||||
for_each_node_sibling(node_ptr)
|
||||
```
|
||||
|
||||
| 参数 | 描述 |
|
||||
|:------------------|:------------------------------------|
|
||||
|node_ptr | 设备节点树节点 |
|
||||
81
components/drivers/fdt/docs/examples.md
Normal file
81
components/drivers/fdt/docs/examples.md
Normal file
|
|
@ -0,0 +1,81 @@
|
|||
# fdt示例 #
|
||||
|
||||
在`examples`文件夹中存放`bcm2711-rpi-4-b.dtb`和`vexpress-v2p-ca9.dtb`可供测试，如果系统可以从bootloader或其他方式获取到bsp本身的dtb，也可以通过修改示例程序进行测试
|
||||
|
||||
## fdt_dump
|
||||
```bash
|
||||
fdt_dump vexpress-v2p-ca9.dtb
|
||||
```
|
||||
|
||||
#### 示例结果 ####
|
||||
```bash
|
||||
/dts-v1/;
|
||||
|
||||
/ {
|
||||
model = "V2P-CA9";
|
||||
arm,hbi = <0x191>;
|
||||
arm,vexpress,site = <0xf>;
|
||||
compatible = "arm,vexpress,v2p-ca9", "arm,vexpress";
|
||||
interrupt-parent = <0x1>;
|
||||
#address-cells = <0x1>;
|
||||
#size-cells = <0x1>;
|
||||
|
||||
chosen {
|
||||
};
|
||||
|
||||
aliases {
|
||||
serial0 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@9000";
|
||||
serial1 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@a000";
|
||||
serial2 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@b000";
|
||||
serial3 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@c000";
|
||||
i2c0 = "/smb@4000000/motherboard/iofpga@7,00000000/i2c@16000";
|
||||
i2c1 = "/smb@4000000/motherboard/iofpga@7,00000000/i2c@2000";
|
||||
};
|
||||
|
||||
...... 省略
|
||||
|
||||
hsb@e0000000 {
|
||||
compatible = "simple-bus";
|
||||
#address-cells = <0x1>;
|
||||
#size-cells = <0x1>;
|
||||
ranges = <0x0 0xe0000000 0x20000000>;
|
||||
#interrupt-cells = <0x1>;
|
||||
interrupt-map-mask = <0x0 0x3>;
|
||||
interrupt-map = <0x0 0x0 0x1 0x0 0x24 0x4 0x0 0x1 0x1 0x0 0x25 0x4 0x0 0x2 0x1 0x0 0x26 0x4 0x0 0x3 0x1 0x0 0x27 0x4>;
|
||||
};
|
||||
};
|
||||
```
|
||||
|
||||
## fdt_test
|
||||
```bash
|
||||
fdt_test
|
||||
```
|
||||
|
||||
#### 示例结果 ####
|
||||
```bash
|
||||
name = uart@9000
|
||||
reg = <0x9000,0x1000>;
|
||||
compatible = "arm,pl011","arm,primecell";
|
||||
|
||||
name = cpus
|
||||
path = /cpus/cpu@0/
|
||||
path = /cpus/cpu@1/
|
||||
path = /cpus/cpu@2/
|
||||
path = /cpus/cpu@3/
|
||||
|
||||
name = user1, lable = v2m:green:user1
|
||||
name = user2, lable = v2m:green:user2
|
||||
name = user3, lable = v2m:green:user3
|
||||
name = user4, lable = v2m:green:user4
|
||||
name = user5, lable = v2m:green:user5
|
||||
name = user6, lable = v2m:green:user6
|
||||
name = user7, lable = v2m:green:user7
|
||||
name = user8, lable = v2m:green:user8
|
||||
|
||||
/memreserve/ 0x0000000000000000 0x0000000000001000;
|
||||
|
||||
phandle = <0x9>
|
||||
name = bt_pins
|
||||
path = /soc/gpio@7e200000/bt_pins/
|
||||
brcm,pins = [2d 00]
|
||||
```
|
||||
7
components/drivers/fdt/docs/version.md
Normal file
7
components/drivers/fdt/docs/version.md
Normal file
|
|
@ -0,0 +1,7 @@
|
|||
# 版本和修订 #
|
||||
|
||||
| Date | Version | Author | Note |
|
||||
| -------- | :-----: | :---- | :---- |
|
||||
| 2021-9-1 | v0.0.1 | GuEe-GUI | 初始版本 |
|
||||
| 2021-11-11 | v1.0.0 | GuEe-GUI | API确定版本 |
|
||||
| | | | |
|
||||
Loading…
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Reference in a new issue