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注意请使用Vendor内核的BSP，如PD17.1.2。

这里按钮s3是通过“gpio-key,wakeup”配置来实现唤醒的：

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themeMidnight
...
			linux,code = <KEY_POWER>;
			gpio-key,wakeup;
		};
...

这个配置的文档：https://www.kernel.org/doc/Documentation/devicetree/bindings/input/gpio-keys.txt

系统还支持从其他接口唤醒，请阅读内核的设备树文档和i.MX6ul的参考手册。