<!DOCTYPE html>
<html lang="en" data-content_root="../../../">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Samsung GPIO implementation — The Linux Kernel documentation</title>
<link rel="stylesheet" type="text/css" href="../../../_static/pygments.css?v=fa44fd50" />
<link rel="stylesheet" type="text/css" href="../../../_static/alabaster.css?v=3918102e" />
<script src="../../../_static/documentation_options.js?v=5929fcd5"></script>
<script src="../../../_static/doctools.js?v=9bcbadda"></script>
<script src="../../../_static/sphinx_highlight.js?v=dc90522c"></script>
<link rel="index" title="Index" href="../../../genindex.html" />
<link rel="search" title="Search" href="../../../search.html" />
<link rel="next" title="Interface between kernel and boot loaders on Exynos boards" href="bootloader-interface.html" />
<link rel="prev" title="Samsung SoC" href="index.html" />
<link rel="stylesheet" href="../../../_static/custom.css" type="text/css" />
</head><body>
<div class="document">
<div class="sphinxsidebar" role="navigation" aria-label="Main">
<div class="sphinxsidebarwrapper">
<p class="logo"><a href="../../../index.html">
<img class="logo" src="../../../_static/logo.svg" alt="Logo of The Linux Kernel"/>
</a></p>
<h1 class="logo"><a href="../../../index.html">The Linux Kernel</a></h1>
<p class="blurb">6.18.50</p>
<search id="searchbox" style="display: none" role="search">
<h3 id="searchlabel">Quick search</h3>
<div class="searchformwrapper">
<form class="search" action="../../../search.html" method="get">
<input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/>
<input type="submit" value="Go" />
</form>
</div>
</search>
<script>document.getElementById('searchbox').style.display = "block"</script>
<p>
<h3 class="kernel-toc-contents">Contents</h3>
<input type="checkbox" class="kernel-toc-toggle" id = "kernel-toc-toggle" checked>
<label class="kernel-toc-title" for="kernel-toc-toggle"></label>
<div class="kerneltoc" id="kerneltoc">
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../process/development-process.html">Development process</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../process/submitting-patches.html">Submitting patches</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../process/code-of-conduct.html">Code of conduct</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../maintainer/index.html">Maintainer handbook</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../process/index.html">All development-process docs</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../core-api/index.html">Core API</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../driver-api/index.html">Driver APIs</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../subsystem-apis.html">Subsystems</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../locking/index.html">Locking</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../process/license-rules.html">Licensing rules</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../doc-guide/index.html">Writing documentation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../dev-tools/index.html">Development tools</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../dev-tools/testing-overview.html">Testing guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../kernel-hacking/index.html">Hacking guide</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../trace/index.html">Tracing</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../fault-injection/index.html">Fault injection</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../livepatch/index.html">Livepatching</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../rust/index.html">Rust</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../admin-guide/index.html">Administration</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../kbuild/index.html">Build system</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../admin-guide/reporting-issues.html">Reporting issues</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../tools/index.html">Userspace tools</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../userspace-api/index.html">Userspace API</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../firmware-guide/index.html">Firmware</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../devicetree/index.html">Firmware and Devicetree</a></li>
</ul>
<ul class="current">
<li class="toctree-l1 current"><a class="reference internal" href="../../index.html">CPU architectures</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="../../arc/index.html">ARC architecture</a></li>
<li class="toctree-l2 current"><a class="reference internal" href="../index.html">ARM Architecture</a><ul class="current">
<li class="toctree-l3"><a class="reference internal" href="../arm.html">ARM Linux 2.6 and upper</a></li>
<li class="toctree-l3"><a class="reference internal" href="../booting.html">Booting ARM Linux</a></li>
<li class="toctree-l3"><a class="reference internal" href="../cluster-pm-race-avoidance.html">Cluster-wide Power-up/power-down race avoidance algorithm</a></li>
<li class="toctree-l3"><a class="reference internal" href="../firmware.html">Interface for registering and calling firmware-specific operations for ARM</a></li>
<li class="toctree-l3"><a class="reference internal" href="../interrupts.html">Interrupts</a></li>
<li class="toctree-l3"><a class="reference internal" href="../kernel_mode_neon.html">Kernel mode NEON</a></li>
<li class="toctree-l3"><a class="reference internal" href="../kernel_user_helpers.html">Kernel-provided User Helpers</a></li>
<li class="toctree-l3"><a class="reference internal" href="../memory.html">Kernel Memory Layout on ARM Linux</a></li>
<li class="toctree-l3"><a class="reference internal" href="../mem_alignment.html">Memory alignment</a></li>
<li class="toctree-l3"><a class="reference internal" href="../tcm.html">ARM TCM (Tightly-Coupled Memory) handling in Linux</a></li>
<li class="toctree-l3"><a class="reference internal" href="../setup.html">Kernel initialisation parameters on ARM Linux</a></li>
<li class="toctree-l3"><a class="reference internal" href="../swp_emulation.html">Software emulation of deprecated SWP instruction (CONFIG_SWP_EMULATE)</a></li>
<li class="toctree-l3"><a class="reference internal" href="../uefi.html">The Unified Extensible Firmware Interface (UEFI)</a></li>
<li class="toctree-l3"><a class="reference internal" href="../vlocks.html">vlocks for Bare-Metal Mutual Exclusion</a></li>
<li class="toctree-l3"><a class="reference internal" href="../porting.html">Porting</a></li>
<li class="toctree-l3"><a class="reference internal" href="../features.html">Feature status on arm architecture</a></li>
<li class="toctree-l3 current"><a class="reference internal" href="../index.html#soc-specific-documents">SoC-specific documents</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="../../arm64/index.html">ARM64 Architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../loongarch/index.html">LoongArch Architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../m68k/index.html">m68k Architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../mips/index.html">MIPS-specific Documentation</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../nios2/index.html">Nios II Specific Documentation</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../openrisc/index.html">OpenRISC Architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../parisc/index.html">PA-RISC Architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../powerpc/index.html">powerpc</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../riscv/index.html">RISC-V architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../s390/index.html">s390 Architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../sh/index.html">SuperH Interfaces Guide</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../sparc/index.html">Sparc Architecture</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../x86/index.html">x86-specific Documentation</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../xtensa/index.html">Xtensa Architecture</a></li>
</ul>
</li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../staging/index.html">Unsorted documentation</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../translations/index.html">Translations</a></li>
</ul>
</div>
<script type="text/javascript"> <!--
var sbar = document.getElementsByClassName("sphinxsidebar")[0];
let currents = document.getElementsByClassName("current")
if (currents.length) {
sbar.scrollTop = currents[currents.length - 1].offsetTop;
}
--> </script>
<div role="note" aria-label="source link">
<h3>This Page</h3>
<ul class="this-page-menu">
<li><a href="../../../_sources/arch/arm/samsung/gpio.rst.txt"
rel="nofollow">Show Source</a></li>
</ul>
</div>
</div>
</div>
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<section id="samsung-gpio-implementation">
<h1>Samsung GPIO implementation<a class="headerlink" href="#samsung-gpio-implementation" title="Link to this heading">¶</a></h1>
<section id="introduction">
<h2>Introduction<a class="headerlink" href="#introduction" title="Link to this heading">¶</a></h2>
<p>This outlines the Samsung GPIO implementation and the architecture
specific calls provided alongside the drivers/gpio core.</p>
</section>
<section id="gpiolib-integration">
<h2>GPIOLIB integration<a class="headerlink" href="#gpiolib-integration" title="Link to this heading">¶</a></h2>
<p>The gpio implementation uses gpiolib as much as possible, only providing
specific calls for the items that require Samsung specific handling, such
as pin special-function or pull resistor control.</p>
<p>GPIO numbering is synchronised between the Samsung and gpiolib system.</p>
</section>
<section id="pin-configuration">
<h2>PIN configuration<a class="headerlink" href="#pin-configuration" title="Link to this heading">¶</a></h2>
<p>Pin configuration is specific to the Samsung architecture, with each SoC
registering the necessary information for the core gpio configuration
implementation to configure pins as necessary.</p>
<p>The <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">s3c_gpio_cfgpin()</span></code> and <code class="xref c c-func broken_xref docutils literal notranslate"><span class="pre">s3c_gpio_setpull()</span></code> provide the means for a
driver or machine to change gpio configuration.</p>
<p>See arch/arm/mach-s3c/gpio-cfg.h for more information on these functions.</p>
</section>
</section>
</div>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="footer">
©The kernel development community.
|
Powered by <a href="https://www.sphinx-doc.org/">Sphinx 8.1.3</a>
& <a href="https://alabaster.readthedocs.io">Alabaster 0.7.16</a>
|
<a href="../../../_sources/arch/arm/samsung/gpio.rst.txt"
rel="nofollow">Page source</a>
</div>
</body>
</html>