linux设备树驱动led点灯

Linux设备树驱动LED点灯的步骤如下：
1. 首先，在linux内核的设备树文件中添加LED节点。在根节点下添加ledtest节点，设置其属性信息，如compatible属性、gpios属性等。这样可以在设备树中定义LED相关的信息。
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