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| <section id="pinctrl-device-drivers"> |
| <h1>Pinctrl Device Drivers<a class="headerlink" href="#pinctrl-device-drivers" title="Permalink to this heading"></a></h1> |
| <ul class="simple"> |
| <li><p>The Pinctl driver framework allows applications and drivers to flexibly configure |
| and manage pin parameters such as functionality, strength, driver type, and slewrate |
| (voltage transition speed). This framework significantly enhances the flexibility |
| and configurability of the system in terms of hardware interface control.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">include/nuttx/pinctrl/pinctrl.h</span></code> |
| All structures and APIs needed to work with pinctrl drivers are provided in |
| this header file.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">pinctrl_dev_s</span></code> and <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">pinctrl_ops_s</span></code>. |
| Each pinctrl device driver must implement an instance of <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">pinctrl_dev_s</span></code>. |
| And the <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">pinctrl_ops_s</span></code> defines a call table with the following methods:</p> |
| <ol class="arabic simple"> |
| <li><p><strong>set_function</strong>: Configures the pin’s multiplexing (Mux) function, allowing it |
| to be set as a specific hardware interface (e.g., UART, SPI, I2C) or as a |
| general-purpose GPIO pin.</p></li> |
| <li><p><strong>set_strength</strong>: Allows the user to configure the pin’s drive strength to meet |
| the requirements of different hardware interfaces.</p></li> |
| <li><p><strong>set_driver</strong>: Controls the pin’s driver type, such as push-pull output or |
| open-drain output.</p></li> |
| <li><p><strong>set_slewrate</strong>: Enables the configuration of pin slew rate, which is crucial |
| for high-speed digital signal transmission, optimizing signal rise and fall times.</p></li> |
| <li><p><strong>select_gpio</strong>: Configures the pin function as GPIO.</p></li> |
| </ol> |
| </li> |
| <li><p>Convenience macros are provided to map these operations directly: |
| <code class="docutils literal notranslate"><span class="pre">PINCTRL_SETFUNCTION</span></code>,``PINCTRL_SETSTRENGTH``,``PINCTRL_SETDRIVER``,``PINCTRL_SETSLEWRATE``, |
| <code class="docutils literal notranslate"><span class="pre">PINCTRL_SELECTGPIO</span></code>.</p></li> |
| <li><p>Application developers can configure and control pins by opening /dev/pinctrl0 nodes |
| and using the ioctl system call. |
| cmd: PINCTRLC_SETFUNCTION, PINCTRLC_SETSTRENGTH, PINCTRLC_SETDRIVER, PINCTRLC_SETSLEWRATE, |
| PINCTRLC_SELECTGPIO. |
| parameters: struct pinctrl_param_s.</p></li> |
| </ul> |
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