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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">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" 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>
|
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div>
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<div class="- topic/body concept/conbody body conbody">
|
||
<p class="- topic/p p" data-ofbid="d51538e33__20250123155201">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>
|
||
|
||
<p class="- topic/p p" data-ofbid="d51538e41__20250123155201">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>
|
||
<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="d51538e46__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e48__20250123155201">CONFIG_CLK</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e52__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e54__20250123155201">CONFIG_CLK_ARTINCHIP</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e58__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e60__20250123155201">CONFIG_CLK_ARTINCHIP_CMU</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e64__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e66__20250123155201">CONFIG_SPL_CLK_ARTINCHIP</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e70__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e72__20250123155201">CONFIG_SPL_CLK_ARTINCHIP_CMU</p>
|
||
</li>
|
||
</ul>
|
||
<p class="- topic/p p" data-ofbid="d51538e77__20250123155201">相关源码有：</p>
|
||
<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="d51538e82__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e84__20250123155201"><span class="+ topic/ph sw-d/filepath ph filepath">include/clk.h</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e89__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e91__20250123155201"><span class="+ topic/ph sw-d/filepath ph filepath">include/clk-uclass.h</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e96__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e98__20250123155201"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/clk.c</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e103__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e105__20250123155201"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/clk-uclass.c</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e110__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e112__20250123155201"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/artinchip/clk-aic.h</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e118__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e120__20250123155201"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/artinchip/clk-artinchip.c</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d51538e125__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e127__20250123155201"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/clk/artinchip/clk-cmu.c</span></p>
|
||
</li>
|
||
</ul>
|
||
</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>
|
||
|
||
<div class="- topic/p p" data-ofbid="d51538e139__20250123155201">相关的 Clock
|
||
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"><code><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,
|
||
<strong class="hl-keyword">struct</strong> phandle_<span class="hl-number">1</span>_arg *cells, <strong class="hl-keyword">struct</strong> clk *clk);
|
||
<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);
|
||
<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);
|
||
<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);
|
||
<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);
|
||
<strong class="hl-keyword">int</strong> clk_release_all(<strong class="hl-keyword">struct</strong> clk *clk, <strong class="hl-keyword">int</strong> count);
|
||
<strong class="hl-keyword">int</strong> clk_enable(<strong class="hl-keyword">struct</strong> clk *clk);
|
||
<strong class="hl-keyword">int</strong> clk_disable(<strong class="hl-keyword">struct</strong> clk *clk);
|
||
ulong clk_set_rate(<strong class="hl-keyword">struct</strong> clk *clk, ulong rate);
|
||
ulong clk_get_rate(<strong class="hl-keyword">struct</strong> clk *clk);</code></pre></div>
|
||
</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>
|
||
|
||
<div class="- topic/p p" data-ofbid="d51538e150__20250123155201">通常硬件设备初始化时，需要配置对应的时钟。Clock 驱动的 probe
|
||
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"><code>clk_get_by_index(); <em class="hl-comment">// drivers/clk/clk-uclass.c</em>
|
||
|-> clk_get_by_index_tail();
|
||
|-> uclass_get_device_by_ofnode(UCLASS_CLK, args->node, &dev_clk);
|
||
|-> uclass_find_device_by_ofnode(id, node, &dev);
|
||
|-> uclass_get_device_tail(dev, ret, devp); <em class="hl-comment">// drivers/core/uclass.c</em>
|
||
|-> device_probe(dev); <em class="hl-comment">// drivers/core/device.c</em>
|
||
|-> drv->probe(dev);
|
||
aic_clk_probe(dev);
|
||
<em class="hl-comment">// drivers/clk/artinchip/clk-cmu.c</em></code></pre></div>
|
||
<p class="- topic/p p" data-ofbid="d51538e155__20250123155201">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
|
||
获取对应的时钟设备。</p>
|
||
<p class="- topic/p p" data-ofbid="d51538e158__20250123155201">DTS 中时钟配置示例：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="clock__codeblock_cqj_zbh_bzb" data-ofbid="clock__codeblock_cqj_zbh_bzb"><code>dma: dma-controller@<span class="hl-number">10000000</span> {
|
||
compatible = <span class="hl-string">"artinchip,aic-dma"</span>;
|
||
...
|
||
clocks = <&ccu CLK_DMA>;
|
||
...
|
||
};
|
||
</code></pre>
|
||
<p class="- topic/p p" data-ofbid="d51538e165__20250123155201">相关 ID 定义可参考：</p>
|
||
<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="d51538e170__20250123155201">
|
||
<p class="- topic/p p" data-ofbid="d51538e172__20250123155201"><span class="+ topic/ph sw-d/filepath ph filepath">include/dt-bindings/clock/artinchip,aic-cmu.h</span></p>
|
||
</li>
|
||
</ul>
|
||
<div class="- topic/p p" data-ofbid="d51538e178__20250123155201">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"><code>clk_get_by_index(dev, index, clk); <em class="hl-comment">// drivers/clk/clk-uclass.c</em>
|
||
| <em class="hl-comment">// 此处 index 是 DTS 中配置给该设备的第几个时钟</em>
|
||
|
|
||
|-> clk_get_by_index_tail();
|
||
|-> uclass_get_device_by_ofnode(UCLASS_CLK, args->node, &dev_clk);
|
||
|-> 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></code></pre></div>
|
||
<div class="- topic/p p" data-ofbid="d51538e183__20250123155201">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"><code>clk_set_rate(clk, rate); <em class="hl-comment">// drivers/clk/clk-uclass.c</em>
|
||
|-> ops->set_rate(clk, rate);
|
||
artinchip_clk_set_rate(clk, rate); <em class="hl-comment">// drivers/clk/artinchip/clk-artinchip.c</em>
|
||
|-> aic_get_clk_info(priv->tree, clk->id, &index);
|
||
<em class="hl-comment">// 驱动内部，使用 clk-id 获取对应的时钟节点</em></code></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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