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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/spinor/spinor_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SPI NOR 使用指南</h1><div class="date inPage">27 Nov 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d157104e22__20250121171615">SPI NOR 属于 SPI 的从设备，在内核中相关驱动通过 <code class="+ topic/ph pr-d/codeph ph codeph">SPI MEM</code> 对接到 SPI 子系统。 在 SPI 控制器初始化时，SPI
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驱动会检查该控制器下是否有挂载的 SPI NOR，有则添加到 SPI BUS
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中。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_nor_user_guide__codeblock_lw1_f5y_c1c" data-ofbid="spi_nor_user_guide__codeblock_lw1_f5y_c1c">aic_spi_probe(dev);
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|-> spi_register_controller(ctlr);/spi_register_master(ctlr);<em class="hl-comment">// spi_register_master 是一个宏</em>
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|-> of_register_spi_devices(ctlr);
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|-> spi = of_register_spi_device(ctlr, nc);
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|-> spi = spi_alloc_device(ctlr);
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|-> of_spi_parse_dt(ctlr, spi, nc);
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|-> rc = spi_add_device(spi);
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<em class="hl-comment">// 将 SPI device 添加到 SPI 总线 spi_bus_type 中</em></pre></div><p class="- topic/p p" data-ofbid="d157104e29__20250121171615">在调用 <code class="+ topic/ph pr-d/codeph ph codeph">spi_add_device</code> 的过程中，会查找和匹配对应设备的驱动程序（如果这时候对
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应的驱动程序还没有被添加到系统中，则在这里先将设备添加到 Bus，等到对应驱动程序 被添加进来时，再进行匹配。）</p><div class="table-container"><table class="- topic/table table frame-all" id="spi_nor_user_guide__table_ebl_25y_c1c" data-ofbid="spi_nor_user_guide__table_ebl_25y_c1c" data-cols="2"><caption></caption><colgroup><col style="width:28.653295128939828%"/><col style="width:71.34670487106017%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="spi_nor_user_guide__table_ebl_25y_c1c__entry__1">模块</th><th class="- topic/entry entry colsep-0 rowsep-1" id="spi_nor_user_guide__table_ebl_25y_c1c__entry__2">驱动源码路径</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi_nor_user_guide__table_ebl_25y_c1c__entry__1">Linux</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi_nor_user_guide__table_ebl_25y_c1c__entry__2"><span class="+ topic/ph sw-d/filepath ph filepath">source/linux-5.10/drivers/mtd/spi-nor/</span></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="spi_nor_user_guide__table_ebl_25y_c1c__entry__1">Uboot</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="spi_nor_user_guide__table_ebl_25y_c1c__entry__2"><span class="+ topic/ph sw-d/filepath ph filepath">source/uboot-2021.10/drivers/mtd/spi/</span></td></tr></tbody></table></div></div></article></main></div>
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