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<div class="section" id="opencapi-device-tree-bindings">
<span id="device-tree-opencapi"></span><h1>OpenCAPI Device Tree Bindings<a class="headerlink" href="#opencapi-device-tree-bindings" title="Permalink to this headline">¶</a></h1>
<div class="section" id="npu-bindings">
<h2>NPU bindings<a class="headerlink" href="#npu-bindings" title="Permalink to this headline">¶</a></h2>
<p>The NPU nodes are similar to those in <a class="reference internal" href="nvlink.html"><span class="doc">Nvlink Device Tree Bindings</span></a>.</p>
<p>We distinguish between OpenCAPI and NVLink links using the
<cite>ibm.npu-link-type</cite> property. NPUs with a mixture of OpenCAPI and
NVLink links are currently unsupported.</p>
<div class="highlight-dts notranslate"><div class="highlight"><pre><span></span><span class="nc">xscom</span><span class="nf">@603fc00000000</span> <span class="p">{</span>
<span class="nc">npu</span><span class="nf">@5011000</span> <span class="p">{</span>
<span class="nf">compatible</span> <span class="o">=</span> <span class="s">"ibm,power9-npu"</span><span class="p">;</span>
<span class="nf">phandle</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0xe6</span><span class="p">>;</span>
<span class="nf">reg</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x5011000</span> <span class="mh">0x2c</span><span class="p">>;</span>
<span class="nf">ibm,npu-index</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x0</span><span class="p">>;</span>
<span class="nf">ibm,npu-links</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x2</span><span class="p">>;</span> <span class="cm">/* Number of links wired up to this npu. */</span>
<span class="nc">link</span><span class="nf">@2</span> <span class="p">{</span>
<span class="nf">compatible</span> <span class="o">=</span> <span class="s">"ibm,npu-link"</span><span class="p">;</span>
<span class="nf">ibm,npu-link-type</span> <span class="o">=</span> <span class="s">"opencapi"</span><span class="p">;</span>
<span class="nf">ibm,npu-group-id</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x1</span><span class="p">>;</span>
<span class="nf">ibm,npu-lane-mask</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0xf1e000</span><span class="p">>;</span> <span class="cm">/* Mask specifying which IBM PHY lanes</span>
<span class="cm"> * are used for this link. 24-bit,</span>
<span class="cm"> * lane 0 is most significant bit */</span>
<span class="nf">ibm,npu-phy</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x80000000</span> <span class="mh">0x9010c3f</span><span class="p">>;</span> <span class="cm">/* SCOM address of the IBM PHY</span>
<span class="cm"> * controlling this link. */</span>
<span class="nf">ibm,npu-link-index</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x2</span><span class="p">>;</span> <span class="cm">/* Hardware link index.</span>
<span class="cm"> * Used to calculate various address offsets. */</span>
<span class="nf">phandle</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0xe7</span><span class="p">>;</span>
<span class="p">};</span>
<span class="nc">link</span><span class="nf">@3</span> <span class="p">{</span>
<span class="nf">compatible</span> <span class="o">=</span> <span class="s">"ibm,npu-link"</span><span class="p">;</span>
<span class="nf">ibm,npu-link-type</span> <span class="o">=</span> <span class="s">"opencapi"</span><span class="p">;</span>
<span class="nf">ibm,npu-group-id</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x2</span><span class="p">>;</span>
<span class="nf">ibm,npu-lane-mask</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x78f</span><span class="p">>;</span>
<span class="nf">ibm,npu-phy</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x80000000</span> <span class="mh">0x9010c3f</span><span class="p">>;</span>
<span class="nf">ibm,npu-link-index</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x3</span><span class="p">>;</span>
<span class="nf">phandle</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0xe8</span><span class="p">>;</span>
<span class="p">};</span>
<span class="p">};</span>
<span class="p">};</span>
</pre></div>
</div>
</div>
<div class="section" id="pci-device-bindings">
<h2>PCI device bindings<a class="headerlink" href="#pci-device-bindings" title="Permalink to this headline">¶</a></h2>
<p>The PCI devices mostly look like regular PCI devices (see <a class="reference internal" href="pci.html"><span class="doc">PCI Device Tree Bindings</span></a>),
but have a few additional fields to allow the devices to be associated
with the relevant NPU. These fields are presently not consumed by
anything but may be used in future.</p>
<div class="highlight-dts notranslate"><div class="highlight"><pre><span></span><span class="nc">pciex</span><span class="nf">@600e800000000</span> <span class="p">{</span>
<span class="cm">/* OpenCAPI specific properties */</span>
<span class="nf">compatible</span> <span class="o">=</span> <span class="s">"ibm,power9-npu-opencapi-pciex", "ibm,ioda2-npu2-opencapi-phb"</span><span class="p">;</span>
<span class="nf">ibm,npcq</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0xe6</span><span class="p">>;</span> <span class="cm">/* phandle to the NPU node */</span>
<span class="nf">ibm,npu-index</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x0</span><span class="p">>;</span>
<span class="nf">ibm,links</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x1</span><span class="p">>;</span>
<span class="cm">/* Generic PCI fields here */</span>
<span class="err">}</span>
</pre></div>
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<ul>
<li><a class="reference internal" href="#">OpenCAPI Device Tree Bindings</a><ul>
<li><a class="reference internal" href="#npu-bindings">NPU bindings</a></li>
<li><a class="reference internal" href="#pci-device-bindings">PCI device bindings</a></li>
</ul>
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