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<div class="section" id="ibm-opal-sensors-device-tree-nodes">
<h1>ibm,opal/sensors/ device tree nodes<a class="headerlink" href="#ibm-opal-sensors-device-tree-nodes" title="Permalink to this headline">¶</a></h1>
<p>All sensors of a POWER8 system are made available to the OS in the
ibm,opal/sensors/ directory. Each sensor is identified with a node
which name follows this pattern :</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o"><</span><span class="n">resource</span> <span class="k">class</span> <span class="nc">name</span><span class="o">>@<</span><span class="n">resource</span> <span class="n">identifier</span><span class="o">>/</span>
</pre></div>
</div>
<p>For example :</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">core</span><span class="o">-</span><span class="n">temp</span><span class="nd">@20</span><span class="o">/</span>
</pre></div>
</div>
<p>Each node has a minimum set of properties describing the sensor :</p>
<ul>
<li><p class="first">a “compatible” property which should be “ibm,opal-sensor”</p>
</li>
<li><p class="first">a “sensor-type” property, which can be “temp”, “fan”, “power”.
More will be added when new resources are supported. This type
is used “as is” by the Linux driver to map sensors in the sysfs
interface of the hwmon framework of Linux.</p>
</li>
<li><p class="first">a “sensor-data” property giving a unique handler for the
OPAL_SENSOR_READ call to be used by Linux to get the value of
a sensor attribute. This value is opaque to the OS but is <em>currently</em>
constructed using the following encoding :</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">|</span> <span class="n">Attr</span><span class="o">.</span> <span class="o">|</span><span class="n">Fam</span><span class="o">|</span><span class="n">Res</span><span class="o">.</span> <span class="o">|</span> <span class="n">Resource</span> <span class="o">|</span>
<span class="o">|</span> <span class="n">Number</span> <span class="o">|</span><span class="n">ily</span><span class="o">|</span><span class="n">Class</span><span class="o">|</span> <span class="n">Id</span> <span class="o">|</span>
<span class="o">|--------|---|-----|----------------|</span>
</pre></div>
</div>
<p>The sensor family (FSP, DTS, etc) is used to dispatch the call to
the appriopriate skiboot component.</p>
</li>
<li><p class="first">a “sensor-status” property giving the state of the sensor. The
status bits have the slightly meanings depending on the resource
type but testing against 0x6 should raise an alarm.</p>
</li>
<li><p class="first">an optional “label” property</p>
</li>
</ul>
<p>Each node can have some extra properties depending on the resource
they represent. See the tree below for more information.</p>
<div class="highlight-dts notranslate"><div class="highlight"><pre><span></span><span class="nc">ibm,opal</span> <span class="p">{</span>
<span class="nc">sensors</span> <span class="p">{</span>
<span class="cm">/*</span>
<span class="cm"> * Core temperatures (DTS) nodes.</span>
<span class="cm"> *</span>
<span class="cm"> * We use the PIR of the core as a resource identifier.</span>
<span class="cm"> */</span>
<span class="nc">core-temp</span><span class="nf">@20</span> <span class="p">{</span>
<span class="nf">compatible</span> <span class="o">=</span> <span class="s">"ibm,opal-sensor"</span><span class="p">;</span>
<span class="nf">name</span> <span class="o">=</span> <span class="s">"core-temp"</span><span class="p">;</span>
<span class="nf">sensor-type</span> <span class="o">=</span> <span class="s">"temp"</span><span class="p">;</span>
<span class="cm">/* Status bits :</span>
<span class="cm"> *</span>
<span class="cm"> * 0x0003 FATAL</span>
<span class="cm"> * 0x0002 CRITICAL</span>
<span class="cm"> * 0x0001 WARNING</span>
<span class="cm"> */</span>
<span class="nf">sensor-data</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x00800020</span><span class="p">>;</span>
<span class="cm">/*</span>
<span class="cm"> * These are extra properties to help Linux output.</span>
<span class="cm"> */</span>
<span class="nf">ibm,pir</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x20</span><span class="p">>;</span>
<span class="nf">label</span> <span class="o">=</span> <span class="s">"Core"</span><span class="p">;</span>
<span class="p">};</span>
<span class="cm">/*</span>
<span class="cm"> * Centaur temperatures (DTS) nodes. Open Power only.</span>
<span class="cm"> *</span>
<span class="cm"> * We use the PIR of the core as a resource identifier.</span>
<span class="cm"> */</span>
<span class="nc">mem-temp</span><span class="nf">@1</span> <span class="p">{</span>
<span class="nf">compatible</span> <span class="o">=</span> <span class="s">"ibm,opal-sensor"</span><span class="p">;</span>
<span class="nf">name</span> <span class="o">=</span> <span class="s">"mem-temp"</span><span class="p">;</span>
<span class="nf">sensor-type</span> <span class="o">=</span> <span class="s">"temp"</span><span class="p">;</span>
<span class="cm">/* Status bits :</span>
<span class="cm"> *</span>
<span class="cm"> * 0x0003 FATAL</span>
<span class="cm"> * 0x0002 CRITICAL</span>
<span class="cm"> * 0x0001 WARNING</span>
<span class="cm"> */</span>
<span class="nf">sensor-data</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x00810001</span><span class="p">>;</span>
<span class="cm">/*</span>
<span class="cm"> * These are extra properties to help Linux output.</span>
<span class="cm"> */</span>
<span class="nf">ibm,chip-id</span> <span class="o">=</span> <span class="p"><</span><span class="mh">0x80000001</span><span class="p">>;</span>
<span class="nf">label</span> <span class="o">=</span> <span class="s">"Centaur"</span><span class="p">;</span>
<span class="p">};</span>
<span class="p">};</span>
<span class="p">};</span>
</pre></div>
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