Best practise for a polling device driver ?

From	"Enrico Weigelt, metux IT consult" <enrico.weigelt@gr13.net>
Newsgroups	linux.kernel
Subject	Best practise for a polling device driver ?
Date	2017-06-29 14:10 +0200
Message-ID	<tXGqK-7pH-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi folks,

I'm currently writing a driver for an (pseudo-)serial device
(actually, a bunch of HW fifo's, which look like serial controllers
to the host), which only supports polling, no interrupts.

So far, I'm just using a kthread in a loop, but that would have to
run w/ high priority sleep very short (needs to transfer several
MB/s on a am33xx), so probably not a good idea.

Another option could be using timers for just looking at the status
registers and issue sw interrupts, which are then handled just like
the w/ the usual interrupt-driven serial ports (IOW: mimic an
interrupt controller).

What do you folks thinkt about that ?


thx.
--mtx

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Best practise for a polling device driver ? "Enrico Weigelt, metux IT consult" <enrico.weigelt@gr13.net> - 2017-06-29 14:10 +0200

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