add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/COPYING
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@@ -16,3 +16,5 @@
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 	Documentation/process/license-rules.rst
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 for more details.
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+All contributions to the Linux Kernel are subject to this COPYING file.