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-<table class="head">
- <tr>
- <td class="head-ltitle">OF_NODE_FROM_XREF(9)</td>
- <td class="head-vol">Kernel Developer's Manual</td>
- <td class="head-rtitle">OF_NODE_FROM_XREF(9)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">OF_node_from_xref</code>,
- <code class="Nm">OF_xref_from_node</code> &#x2014; <span class="Nd">convert
- between kernel phandle and effective phandle</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">dev/ofw/ofw_bus.h</a>&gt;</code>
- <br/>
- <code class="In">#include
- &lt;<a class="In">dev/ofw/ofw_bus_subr.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">phandle_t</var>
- <br/>
- <code class="Fn">OF_node_from_xref</code>(<var class="Fa" style="white-space: nowrap;">phandle_t
- xref</var>);</p>
-<p class="Pp"><var class="Ft">phandle_t</var>
- <br/>
- <code class="Fn">OF_xref_from_node</code>(<var class="Fa" style="white-space: nowrap;">phandle_t
- node</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">Some OpenFirmware implementations (FDT, IBM) have a concept of
- effective phandle or xrefs. They are used to cross-reference device tree
- nodes. For instance, a framebuffer controller may refer to a GPIO controller
- and pin that controls the backlight. In this example, the GPIO node would
- have a cell (32-bit integer) property with a reserved name like
- &quot;phandle&quot; or &quot;linux,phandle&quot; whose value uniquely
- identifies the node. The actual name depends on the implementation. The
- framebuffer node would have a property with the name described by device
- bindings (device-specific set of properties). It can be a cell property or a
- combined property with one part of it being a cell. The value of the
- framebuffer node's property would be the same as the value of the GPIO
- &quot;phandle&quot; property so it can be said that the framebuffer node
- refers to the GPIO node. The kernel uses internal logic to assign unique
- identifiers to the device tree nodes, and these values do not match the
- values of &quot;phandle&quot; properties.
- <a class="permalink" href="#OF_node_from_xref"><code class="Fn" id="OF_node_from_xref">OF_node_from_xref</code></a>()
- and <code class="Fn">OF_xref_from_node</code>() are used to perform
- conversion between these two kinds of node identifiers.</p>
-<p class="Pp" id="OF_node_from_xref~2"><a class="permalink" href="#OF_node_from_xref~2"><code class="Fn">OF_node_from_xref</code></a>()
- returns the kernel phandle for the effective phandle
- <var class="Fa">xref</var>. If one cannot be found or the OpenFirmware
- implementation does not support effective phandles, the function returns the
- input value.</p>
-<p class="Pp" id="OF_xref_from_node"><a class="permalink" href="#OF_xref_from_node"><code class="Fn">OF_xref_from_node</code></a>()
- returns the effective phandle for the kernel phandle
- <var class="Fa">node</var>. If one cannot be found or the OpenFirmware
- implementation does not support effective phandles, the function returns the
- input value.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
-<div class="Bd Li">
-<pre> phandle_t panelnode, panelxref;
- char *model;
-
- if (OF_getencprop(node, &quot;lcd-panel&quot;, &amp;panelxref) &lt;= 0)
- return;
-
- panelnode = OF_node_from_xref(panelxref);
- if (OF_getprop_alloc(hdminode, &quot;model&quot;, (void **)&amp;model) &lt;= 0)
- return;</pre>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">OF_device_from_xref(9)</a>,
- <a class="Xr">OF_device_register_xref(9)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">This manual page was written by <span class="An">Oleksandr
- Tymoshenko</span>
- &lt;<a class="Mt" href="mailto:gonzo@FreeBSD.org">gonzo@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">April 9, 2018</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>