IRQ.txt: add a markup for its title
This simple document only needs a markup for its title to be using the standard we're adopting for text documents. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>hifive-unleashed-5.1
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===============
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What is an IRQ?
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What is an IRQ?
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An IRQ is an interrupt request from a device.
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An IRQ is an interrupt request from a device.
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Currently they can come in over a pin, or over a packet.
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Currently they can come in over a pin, or over a packet.
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