1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>struct spi_board_info</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="spi.html" title="Chapter 9. Serial Peripheral Interface (SPI)"><link rel="prev" href="API-spi-w8r16be.html" title="spi_w8r16be"><link rel="next" href="API-spi-register-board-info.html" title="spi_register_board_info"></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">struct spi_board_info</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-spi-w8r16be.html">Prev</a> </td><th width="60%" align="center">Chapter 9. Serial Peripheral Interface (SPI)</th><td width="20%" align="right"> <a accesskey="n" href="API-spi-register-board-info.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-struct-spi-board-info"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct spi_board_info — 2 board-specific template for a SPI device 3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting"> 4struct spi_board_info { 5 char modalias[SPI_NAME_SIZE]; 6 const void * platform_data; 7 void * controller_data; 8 int irq; 9 u32 max_speed_hz; 10 u16 bus_num; 11 u16 chip_select; 12 u16 mode; 13}; </pre></div><div class="refsect1"><a name="idp1115013820"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">modalias[SPI_NAME_SIZE]</span></dt><dd><p> 14 Initializes spi_device.modalias; identifies the driver. 15 </p></dd><dt><span class="term">platform_data</span></dt><dd><p> 16 Initializes spi_device.platform_data; the particular 17 data stored there is driver-specific. 18 </p></dd><dt><span class="term">controller_data</span></dt><dd><p> 19 Initializes spi_device.controller_data; some 20 controllers need hints about hardware setup, e.g. for DMA. 21 </p></dd><dt><span class="term">irq</span></dt><dd><p> 22 Initializes spi_device.irq; depends on how the board is wired. 23 </p></dd><dt><span class="term">max_speed_hz</span></dt><dd><p> 24 Initializes spi_device.max_speed_hz; based on limits 25 from the chip datasheet and board-specific signal quality issues. 26 </p></dd><dt><span class="term">bus_num</span></dt><dd><p> 27 Identifies which spi_master parents the spi_device; unused 28 by <code class="function">spi_new_device</code>, and otherwise depends on board wiring. 29 </p></dd><dt><span class="term">chip_select</span></dt><dd><p> 30 Initializes spi_device.chip_select; depends on how 31 the board is wired. 32 </p></dd><dt><span class="term">mode</span></dt><dd><p> 33 Initializes spi_device.mode; based on the chip datasheet, board 34 wiring (some devices support both 3WIRE and standard modes), and 35 possibly presence of an inverter in the chipselect path. 36 </p></dd></dl></div></div><div class="refsect1"><a name="idp1115021012"></a><h2>Description</h2><p> 37 When adding new SPI devices to the device tree, these structures serve 38 as a partial device template. They hold information which can't always 39 be determined by drivers. Information that <code class="function">probe</code> can establish (such 40 as the default transfer wordsize) is not included here. 41 </p><p> 42 43 These structures are used in two places. Their primary role is to 44 be stored in tables of board-specific device descriptors, which are 45 declared early in board initialization and then used (much later) to 46 populate a controller's device tree after the that controller's driver 47 initializes. A secondary (and atypical) role is as a parameter to 48 <code class="function">spi_new_device</code> call, which happens after those controller drivers 49 are active in some dynamic board configuration models. 50</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-spi-w8r16be.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="spi.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-spi-register-board-info.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">spi_w8r16be</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">spi_register_board_info</span></td></tr></table></div></body></html> 51