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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/display/display_parameter_backlight.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">PWM Backlight</h1>
<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 1 minute(s)
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_dts_parameter_backlight__codeblock_o4c_pxf_d1c" data-ofbid="display_dts_parameter_backlight__codeblock_o4c_pxf_d1c"><code>panel_rgb {
...
backlight = &lt;&amp;backlight&gt;;
}
backlight: backlight {
compatible = <span class="hl-string">"pwm-backlight"</span>;
<em class="hl-comment">/* pwm node name; pwm device No.; period_ns; pwm_polarity */</em>
pwms = &lt;&amp;pwm <span class="hl-number">2</span> <span class="hl-number">1000000</span> <span class="hl-number">0</span>&gt;;
brightness-levels = &lt;<span class="hl-number">0</span> <span class="hl-number">10</span> <span class="hl-number">20</span> <span class="hl-number">30</span> <span class="hl-number">40</span> <span class="hl-number">50</span> <span class="hl-number">60</span> <span class="hl-number">70</span> <span class="hl-number">80</span> <span class="hl-number">90</span> <span class="hl-number">100</span>&gt;;
<strong class="hl-keyword">default</strong>-brightness-level = &lt;<span class="hl-number">8</span>&gt;;
status = <span class="hl-string">"okay"</span>;
};
&amp;pwm {
status = <span class="hl-string">"okay"</span>;
pinctrl-names = <span class="hl-string">"default"</span>;
pinctrl-<span class="hl-number">0</span> = &lt;&amp;pwm2_pins_b&gt;;
<em class="hl-comment">/* mode: up-count, down-count, up-down-count
action: none, low, high, inverse */</em>
pwm2 {
aic,mode = <span class="hl-string">"up-count"</span>;
aic,tb-clk-rate = &lt;<span class="hl-number">24000000</span>&gt;;
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"none"</span>;
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>;
aic,<strong class="hl-keyword">default</strong>-level = &lt;<span class="hl-number">0</span>&gt;;
aic,rise-edge-delay = &lt;<span class="hl-number">10</span>&gt;;
aic,fall-edge-delay = &lt;<span class="hl-number">10</span>&gt;;
status = <span class="hl-string">"okay"</span>;
};
};</code></pre>
<p class="- topic/p p" data-ofbid="d62956e36__20250123155203">背光控制依赖 PWM 模块，详细配置可参考 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="../pwm/pwm_user_guide.html">PWM 使用指南</a>。</p>
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