Rockchip
时钟子系统
开发指南
目录
Copyright 2016 @Fuzhou Rockchip Electronics Co., Ltd. II
目录
1 方案概述 ........................................................................................................... 1-1
1.1 概述 ......................................................................................................... 1-1
1.2 重要概念 ................................................................................................... 1-1
1.3 时钟方案 ................................................................................................... 1-1
1.4 总体流程 ................................................................................................... 1-2
1.5 代码结构 ................................................................................................... 1-3
2 CLOCK 开发指南 ................................................................................................. 2-4
2.1 概述 ......................................................................................................... 2-4
2.2 时钟的相关概念 ........................................................................................... 2-4
2.2.1 PLL ................................................................................................. 2-4
2.2.2 ACLK、PCLK、HCLK ........................................................................... 2-4
2.2.3 GATING ........................................................................................... 2-5
2.3 时钟配置 ................................................................................................... 2-5
2.3.1 时钟初始化配置 ................................................................................... 2-5
2.3.2 Driver 的时钟配置 ............................................................................... 2-6
2.4 CLOCK API 接口 ......................................................................................... 2-7
2.4.1 主要的 CLK API .................................................................................. 2-7
2.5 CLOCK 调试 ............................................................................................... 2-9
3 常见问题分析 .................................................................................................... 3-11
3.1 PLL 设置 ................................................................................................. 3-11
3.1.1 PLL 类型查找 .................................................................................... 3-11
3.1.2 PLL 回调函数的定义 ........................................................................... 3-11
3.1.3 PLL 频率表格定义 .............................................................................. 3-11
3.1.4 3.1.4 PLL 计算公式 ........................................................................... 3-11
3.2 部分特殊时钟的设置 ................................................................................... 3-12
3.2.1 LCDC 显示相关的时钟 ......................................................................... 3-12
3.2.2 EMMC、SDIO、SDMMC .................................................................... 3-13
3.2.3 小数分频 ......................................................................................... 3-13
3.2.4 以太网时钟 ...................................................................................... 3-13
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