linux-kernel - Re: [RFC PATCH 0/7] Introducing ZIO, a new I/O framework

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Message-ID: <4ED12B50.9090206@metafoo.de>
Date:	Sat, 26 Nov 2011 19:09:20 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Alessandro Rubini <rubini@...dd.com>
CC:	linux-iio@...r.kernel.org, greg@...ah.com,
	linux-kernel@...r.kernel.org, federico.vaga@...il.com,
	dcobas@...n.ch, siglesia@...n.ch, manohar.vanga@...n.ch
Subject: Re: [RFC PATCH 0/7] Introducing ZIO, a new I/O framework

On 11/26/2011 06:30 PM, Alessandro Rubini wrote:
> This RFC patch-set introduces the ZIO framework for input/output,
> which will be used in the new series of drivers by the BE-CO-HT
> group at CERN.
> 
> The use-case it is meant to cover is very fast I/O with
> hardware-provided timestamps.  The first production driver we will
> support is a 100Ms/s 4-channel 14-bit ADC (developed on ohwr: see
> http://www.ohwr.org/projects/fmc-adc-100m14b4cha ).  We need similar
> bandwidth on output.
> 
> The synchronization engine of that FMC card and other ones is going to
> be White Rabbit (http://www.ohwr.org/projects/white-rabbit).
> 
> Currently, the patch-set includes one example driver (zio-zero)
> that behaves like /dev/zero and /dev/urandom. Other drivers will
> come soon, both demo and real hardware.
> 
> Slides for a tutorial on the design ideas are online here:
> http://www.ohwr.org/attachments/881/zio-111123.pdf
> 
> A list of pending issues and development plans is online at:
> http://www.ohwr.org/projects/zio/wiki/Todo

You've Cc'ed the IIO mailinglist, so you know about the IIO framework. Could
you explain why you need a new framework and your devices can't be supported by
the IIO framework? After a first quick glance ZIO looks to me like a subset of IIO.

- Lars
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