1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>mdiobus_read</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Networking and Network Devices APIs"><link rel="up" href="ch02s02.html" title="PHY Support"><link rel="prev" href="API-mdiobus-free.html" title="mdiobus_free"><link rel="next" href="API-mdiobus-write.html" title="mdiobus_write"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">mdiobus_read</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-mdiobus-free.html">Prev</a>&#160;</td><th width="60%" align="center">PHY Support</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-mdiobus-write.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-mdiobus-read"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>mdiobus_read &#8212; 
2     Convenience function for reading a given MII mgmt register
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">mdiobus_read </b>(</code></td><td>struct mii_bus * <var class="pdparam">bus</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">addr</var>, </td></tr><tr><td>&#160;</td><td>u32 <var class="pdparam">regnum</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1099515860"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>bus</code></em></span></dt><dd><p>
4     the mii_bus struct
5    </p></dd><dt><span class="term"><em class="parameter"><code>addr</code></em></span></dt><dd><p>
6     the phy address
7    </p></dd><dt><span class="term"><em class="parameter"><code>regnum</code></em></span></dt><dd><p>
8     register number to read
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1099519500"></a><h2>NOTE</h2><p>
10   MUST NOT be called from interrupt context,
11   because the bus read/write functions may wait for an interrupt
12   to conclude the operation.
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