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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/pinctrl/pinctrl-key_procedures.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</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 class="- topic/body concept/conbody body conbody">
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<section class="- topic/section section" id="pinctrl_key_procedures__section_rlh_tfs_21c" data-ofbid="pinctrl_key_procedures__section_rlh_tfs_21c"><h2 class="- topic/title title sectiontitle">pin 脚功能定义</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d198318e38__20250123155222">在 pinctrl 子系统中，有 function 和 group 的概念。function 是指某个具体的功能，如 uart0、spi1、i2c2 等。soc 的几个 pin 脚可以构成一个 group，形成特定的功能，如 PA0 和 PA1 可以组成 uart0。一个 function 往往包含一个或多个 group，例如，uart0 这个 function 可以由 PA0 和 PA1 组成，也可以由 PA2 和 PA3 组成。pinctrl 子系统就是通过 function 和 group 来确定最终需要设置的 pin 脚。</p>
|
||
<p class="- topic/p p" data-ofbid="d198318e41__20250123155222">PINCTRL 模块的驱动定义了一个结构体数组，存储每个 pin 脚的所有可复用功能。如下所示，PA0 是该 pin 脚的名称，下面依次是 PA0 可实现的功能复用。AIC_FUNCTION(index,
|
||
func_name)用来定义 pin 脚功能复用时所对应的索引值。即 PA0 作为 GPIOA0 时，是使用的 function 1。作为 uart0 时，是使用的 function
|
||
5。驱动中并不会区分该 pin 脚是 uart0 的 RX 还是 TX 这些细节。</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pinctrl_key_procedures__pre_vlh_tfs_21c" data-ofbid="pinctrl_key_procedures__pre_vlh_tfs_21c"><code><strong class="hl-keyword">static</strong> <strong class="hl-keyword">struct</strong> aic_desc_pin aic_pins_v1[] = {
|
||
AIC_PIN(
|
||
PINCTRL_PIN(<span class="hl-number">0</span>, <span class="hl-string">"PA0"</span>),
|
||
AIC_FUNCTION(<span class="hl-number">1</span>, <span class="hl-string">"GPIOA0"</span>),
|
||
AIC_FUNCTION(<span class="hl-number">2</span>, <span class="hl-string">"GPAI0"</span>),
|
||
AIC_FUNCTION(<span class="hl-number">3</span>, <span class="hl-string">"jtag"</span>),
|
||
AIC_FUNCTION(<span class="hl-number">5</span>, <span class="hl-string">"uart0"</span>)
|
||
),
|
||
AIC_PIN(
|
||
PINCTRL_PIN(<span class="hl-number">1</span>, <span class="hl-string">"PA1"</span>),
|
||
AIC_FUNCTION(<span class="hl-number">1</span>, <span class="hl-string">"GPIOA1"</span>),
|
||
AIC_FUNCTION(<span class="hl-number">2</span>, <span class="hl-string">"GPAI1"</span>),
|
||
AIC_FUNCTION(<span class="hl-number">3</span>, <span class="hl-string">"jtag"</span>),
|
||
AIC_FUNCTION(<span class="hl-number">5</span>, <span class="hl-string">"uart0"</span>)
|
||
),
|
||
<em class="hl-comment">/* 此处省略其它 pin 脚配置 */</em>
|
||
}</code></pre>
|
||
<p class="- topic/p p" data-ofbid="d198318e47__20250123155222">在 pinctrl 子系统中，一个 group 一般会包含多个 pin 脚。而在 PINCTRL 模块实现的驱动中，是将每个 pin 脚都看作一个 group，这样做的优点是：</p>
|
||
<ul class="- topic/ul ul" id="pinctrl_key_procedures__ul_wlh_tfs_21c" data-ofbid="pinctrl_key_procedures__ul_wlh_tfs_21c">
|
||
<li class="- topic/li li" data-ofbid="d198318e53__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e55__20250123155222">不需要再单独定义每个 group 的 pin 脚组成情况，</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d198318e59__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e61__20250123155222">不需要再定义 function 与 group 的对应关系</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d198318e65__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e67__20250123155222">驱动源码简单明了，由上面的数组可以快速直观的了解到每个 pin 脚可复用的功能</p>
|
||
</li>
|
||
</ul>
|
||
<div class="- topic/note note note note_note" id="pinctrl_key_procedures__note_uf5_rgs_21c" data-ofbid="pinctrl_key_procedures__note_uf5_rgs_21c"><span class="note__title">注：</span> <div class="note__body">
|
||
<p class="- topic/p p" data-ofbid="d198318e74__20250123155222">按照 pinctrl 子系统对 function 和 group 的定义，gpio 模块的 uart0 包含 2 个 group，每个 group 包含 2 个 pin 脚，通过 uart0 可以找到这 4 个 pin 脚。而按照 gpio 模块实现的驱动，uart0 包含 4 个 group，每个 group 包含 1 个 pin 脚，最终通过 uart0 也可以找到 4 个 pin 脚。</p>
|
||
</div></div>
|
||
</section>
|
||
<section class="- topic/section section" id="pinctrl_key_procedures__section_ulh_tfs_21c" data-ofbid="pinctrl_key_procedures__section_ulh_tfs_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
|
||
|
||
<ol class="- topic/ol ol" id="pinctrl_key_procedures__ol_xlh_tfs_21c" data-ofbid="pinctrl_key_procedures__ol_xlh_tfs_21c">
|
||
<li class="- topic/li li" data-ofbid="d198318e86__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e88__20250123155222">释放 reset 和 clock</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d198318e92__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e94__20250123155222">调用 state，构建 function 与 group 的关系</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d198318e98__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e100__20250123155222">初始化 pinctrl 结构体变量</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d198318e104__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e106__20250123155222">注册 controller 设备</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d198318e110__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e112__20250123155222">调用 bank，注册各个 gpio bank</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d198318e117__20250123155222">
|
||
<p class="- topic/p p" data-ofbid="d198318e119__20250123155222">初始化完成</p>
|
||
</li>
|
||
</ol>
|
||
</section>
|
||
<section class="- topic/section section" id="pinctrl_key_procedures__section_ylh_tfs_21c" data-ofbid="pinctrl_key_procedures__section_ylh_tfs_21c"><h2 class="- topic/title title sectiontitle">设备 pinmux 配置流程</h2><p class="- topic/p p" data-ofbid="d198318e128__20250123155222">在各个外设的驱动中，并没有调用与 pin 脚复用相关的接口，那么各个外设的 pin 脚复用功能是什么时候生效的呢？pin 脚复用功能是如何进行初始化的？了解这个过程，有助于加深对 pinctrl 子系统的了解。外设的 pin 脚复用初始化流程如下：</p><div class="- topic/p p" data-ofbid="d198318e130__20250123155222"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="pinctrl_key_procedures__image_zlh_tfs_21c" src="../../../images/pinctrl/pinmux_initialize.png" width="576" alt="pinmux_initialize"/></div><br/></div></section>
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<section class="- topic/section section" id="pinctrl_key_procedures__section_uh4_tgs_21c" data-ofbid="pinctrl_key_procedures__section_uh4_tgs_21c"><h2 class="- topic/title title sectiontitle">中断处理流程</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d198318e142__20250123155222"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="pinctrl_key_procedures__image_amh_tfs_21c" src="../../../images/pinctrl/pinctrl_irq_flow.png" width="576" alt="irq_flow1"/></div><br/></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="#pinctrl_key_procedures__section_rlh_tfs_21c" data-tocid="pinctrl_key_procedures__section_rlh_tfs_21c">pin 脚功能定义</a></div></li><li class="section-item"><div class="section-title"><a href="#pinctrl_key_procedures__section_ulh_tfs_21c" data-tocid="pinctrl_key_procedures__section_ulh_tfs_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#pinctrl_key_procedures__section_ylh_tfs_21c" data-tocid="pinctrl_key_procedures__section_ylh_tfs_21c">设备 pinmux 配置流程</a></div></li><li class="section-item"><div class="section-title"><a href="#pinctrl_key_procedures__section_uh4_tgs_21c" data-tocid="pinctrl_key_procedures__section_uh4_tgs_21c">中断处理流程</a></div></li></ul></div>
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