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doc/topics/sdk/boot/uboot-clock-drivers.html
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doc/topics/sdk/boot/uboot-clock-drivers.html
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<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.0">
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<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><meta name="description" content="本章节描述 ArtInChip 平台的 U-Boot 时钟配置相关内容。 驱动框架 U-Boot 驱动模型支持 Clock，ArtInChip 平台中 Clock 驱动基于该框架进行实现。 相关配置为： CONFIG_CLK CONFIG_CLK_ARTINCHIP CONFIG_CLK_ARTINCHIP_CMU CONFIG_SPL_CLK_ARTINCHIP ..."/><meta name="DC.rights.owner" content="(C) 版权 2025"/><meta name="copyright" content="(C) 版权 2025"/><meta name="generator" content="DITA-OT"/><meta name="DC.type" content="concept"/><meta name="DC.creator" content="yan.wang"/><meta name="DC.date.modified" content="2024-12-04"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="clock"/><meta name="DC.language" content="zh-CN"/><title>Clock</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/boot/uboot-clock-drivers.dita"/><meta name="wh-out-relpath" content="topics/sdk/boot/uboot-clock-drivers.html"/>
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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/boot/uboot-clock-drivers.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Clock</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d50638e22__20250121171518">本章节描述 ArtInChip 平台的 U-Boot 时钟配置相关内容。</p><section class="- topic/section section" id="clock__section_tpj_zbh_bzb" data-ofbid="clock__section_tpj_zbh_bzb"><h2 class="- topic/title title sectiontitle">驱动框架</h2>
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<p class="- topic/p p" data-ofbid="d50638e29__20250121171518">U-Boot 驱动模型支持 Clock，ArtInChip 平台中 Clock 驱动基于该框架进行实现。 相关配置为：</p>
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<ul class="- topic/ul ul" id="clock__ul_vpj_zbh_bzb" data-ofbid="clock__ul_vpj_zbh_bzb"><li class="- topic/li li" data-ofbid="d50638e33__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e35__20250121171518">CONFIG_CLK</p>
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</li><li class="- topic/li li" data-ofbid="d50638e38__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e40__20250121171518">CONFIG_CLK_ARTINCHIP</p>
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</li><li class="- topic/li li" data-ofbid="d50638e43__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e45__20250121171518">CONFIG_CLK_ARTINCHIP_CMU</p>
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</li><li class="- topic/li li" data-ofbid="d50638e48__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e50__20250121171518">CONFIG_SPL_CLK_ARTINCHIP</p>
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</li><li class="- topic/li li" data-ofbid="d50638e53__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e55__20250121171518">CONFIG_SPL_CLK_ARTINCHIP_CMU</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d50638e59__20250121171518">相关源码有：</p>
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<ul class="- topic/ul ul" id="clock__ul_xpj_zbh_bzb" data-ofbid="clock__ul_xpj_zbh_bzb"><li class="- topic/li li" data-ofbid="d50638e63__20250121171518">
|
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<p class="- topic/p p" data-ofbid="d50638e65__20250121171518"><span class="+ topic/ph sw-d/filepath ph filepath">include/clk.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d50638e69__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e71__20250121171518"><span class="+ topic/ph sw-d/filepath ph filepath">include/clk-uclass.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d50638e75__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e77__20250121171518"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/clk.c</span></p>
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||||
</li><li class="- topic/li li" data-ofbid="d50638e81__20250121171518">
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||||
<p class="- topic/p p" data-ofbid="d50638e83__20250121171518"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/clk-uclass.c</span></p>
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||||
</li><li class="- topic/li li" data-ofbid="d50638e87__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e89__20250121171518"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/artinchip/clk-aic.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d50638e93__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e95__20250121171518"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/artinchip/clk-artinchip.c</span></p>
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</li><li class="- topic/li li" data-ofbid="d50638e99__20250121171518">
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<p class="- topic/p p" data-ofbid="d50638e101__20250121171518"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/artinchip/clk-cmu.c</span></p>
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</li></ul>
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</section><section class="- topic/section section" id="clock__section_ypj_zbh_bzb" data-ofbid="clock__section_ypj_zbh_bzb"><h2 class="- topic/title title sectiontitle">驱动接口</h2>
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<div class="- topic/p p" data-ofbid="d50638e111__20250121171518">相关的 Clock
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驱动接口有：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="clock__codeblock_wmw_rmr_c1c" data-ofbid="clock__codeblock_wmw_rmr_c1c"><strong class="hl-keyword">int</strong> clk_get_by_index_platdata(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">int</strong> index,
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<strong class="hl-keyword">struct</strong> phandle_<span class="hl-number">1</span>_arg *cells, <strong class="hl-keyword">struct</strong> clk *clk);
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<strong class="hl-keyword">int</strong> clk_get_by_index(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">int</strong> index, <strong class="hl-keyword">struct</strong> clk *clk);
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<strong class="hl-keyword">int</strong> clk_get_by_index_nodev(ofnode node, <strong class="hl-keyword">int</strong> index, <strong class="hl-keyword">struct</strong> clk *clk);
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<strong class="hl-keyword">int</strong> clk_get_bulk(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">struct</strong> clk_bulk *bulk);
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<strong class="hl-keyword">int</strong> clk_get_by_name(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">const</strong> <strong class="hl-keyword">char</strong> *name, <strong class="hl-keyword">struct</strong> clk *clk);
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<strong class="hl-keyword">int</strong> clk_release_all(<strong class="hl-keyword">struct</strong> clk *clk, <strong class="hl-keyword">int</strong> count);
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<strong class="hl-keyword">int</strong> clk_enable(<strong class="hl-keyword">struct</strong> clk *clk);
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<strong class="hl-keyword">int</strong> clk_disable(<strong class="hl-keyword">struct</strong> clk *clk);
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ulong clk_set_rate(<strong class="hl-keyword">struct</strong> clk *clk, ulong rate);
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ulong clk_get_rate(<strong class="hl-keyword">struct</strong> clk *clk);</pre></div>
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</section><section class="- topic/section section" id="clock__section_aqj_zbh_bzb" data-ofbid="clock__section_aqj_zbh_bzb"><h2 class="- topic/title title sectiontitle">初始化和使用</h2>
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<div class="- topic/p p" data-ofbid="d50638e121__20250121171518">通常硬件设备初始化时，需要配置对应的时钟。Clock 驱动的 probe
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在时钟设备第一次被获取时触发。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="clock__codeblock_qvy_smr_c1c" data-ofbid="clock__codeblock_qvy_smr_c1c">clk_get_by_index(); <em class="hl-comment">// drivers/clk/clk-uclass.c</em>
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|-> clk_get_by_index_tail();
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|-> uclass_get_device_by_ofnode(UCLASS_CLK, args->node, &dev_clk);
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|-> uclass_find_device_by_ofnode(id, node, &dev);
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|-> uclass_get_device_tail(dev, ret, devp); <em class="hl-comment">// drivers/core/uclass.c</em>
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|-> device_probe(dev); <em class="hl-comment">// drivers/core/device.c</em>
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|-> drv->probe(dev);
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aic_clk_probe(dev);
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<em class="hl-comment">// drivers/clk/artinchip/clk-cmu.c</em></pre></div>
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<p class="- topic/p p" data-ofbid="d50638e126__20250121171518">设备使用的时钟通过时钟树进行管理。在时钟树中，每一个时钟都被分配一个具体的 ID， 并且在 DTS 中配置给需要的硬件设备。设备初始化时，通过 FDT
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获取对应的时钟设备。</p>
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<p class="- topic/p p" data-ofbid="d50638e129__20250121171518">DTS 中时钟配置示例：</p>
|
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="clock__codeblock_cqj_zbh_bzb" data-ofbid="clock__codeblock_cqj_zbh_bzb">dma: dma-controller@<span class="hl-number">10000000</span> {
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compatible = <span class="hl-string">"artinchip,aic-dma"</span>;
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...
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clocks = <&ccu CLK_DMA>;
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...
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};
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</pre>
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<p class="- topic/p p" data-ofbid="d50638e136__20250121171518">相关 ID 定义可参考：</p>
|
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<ul class="- topic/ul ul" id="clock__ul_eqj_zbh_bzb" data-ofbid="clock__ul_eqj_zbh_bzb"><li class="- topic/li li" data-ofbid="d50638e140__20250121171518">
|
||||
<p class="- topic/p p" data-ofbid="d50638e142__20250121171518"><span class="+ topic/ph sw-d/filepath ph filepath">include/dt-bindings/clock/artinchip,aic-cmu.h</span></p>
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</li></ul>
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||||
<div class="- topic/p p" data-ofbid="d50638e147__20250121171518">获取时钟设备的流程：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="clock__codeblock_aln_5mr_c1c" data-ofbid="clock__codeblock_aln_5mr_c1c">clk_get_by_index(dev, index, clk); <em class="hl-comment">// drivers/clk/clk-uclass.c</em>
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| <em class="hl-comment">// 此处 index 是 DTS 中配置给该设备的第几个时钟</em>
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|
|
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|-> clk_get_by_index_tail();
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|-> uclass_get_device_by_ofnode(UCLASS_CLK, args->node, &dev_clk);
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|-> clk_of_xlate_default(clk, args);
|
||||
|-> clk->id = args->args[<span class="hl-number">0</span>]; <em class="hl-comment">// 获取到具体的时钟 ID</em></pre></div>
|
||||
<div class="- topic/p p" data-ofbid="d50638e152__20250121171518">需要设置和获取相关时钟信息时，通过 <code class="+ topic/ph pr-d/codeph ph codeph">clk->id</code>
|
||||
访问时钟树。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="clock__codeblock_r25_5mr_c1c" data-ofbid="clock__codeblock_r25_5mr_c1c">clk_set_rate(clk, rate); <em class="hl-comment">// drivers/clk/clk-uclass.c</em>
|
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|-> ops->set_rate(clk, rate);
|
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artinchip_clk_set_rate(clk, rate); <em class="hl-comment">// drivers/clk/artinchip/clk-artinchip.c</em>
|
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|-> aic_get_clk_info(priv->tree, clk->id, &index);
|
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<em class="hl-comment">// 驱动内部，使用 clk-id 获取对应的时钟节点</em></pre></div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#clock__section_tpj_zbh_bzb" data-tocid="clock__section_tpj_zbh_bzb">驱动框架</a></div></li><li class="section-item"><div class="section-title"><a href="#clock__section_ypj_zbh_bzb" data-tocid="clock__section_ypj_zbh_bzb">驱动接口</a></div></li><li class="section-item"><div class="section-title"><a href="#clock__section_aqj_zbh_bzb" data-tocid="clock__section_aqj_zbh_bzb">初始化和使用</a></div></li></ul></div>
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<div id="modal_img_large" class="modal">
|
||||
<span class="close oxy-icon oxy-icon-remove"></span>
|
||||
<div id="modal_img_container"></div>
|
||||
<div id="caption"></div>
|
||||
</div>
|
||||
|
||||
|
||||
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
||||
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user