Re: [PATCH v4 1/2] New driver: Xillybus generic interface for FPGA(programmable logic)

From: Hans J. Koch
Date: Mon May 20 2013 - 17:50:52 EST

On Fri, May 17, 2013 at 05:53:39PM +0300, Eli Billauer wrote:
> This is the documentation for the Xillybus driver. It's intended for kernel
> maintainers, since actual users will most likely rely on other documentation.
> It has turned out somewhat tricky to put Xillybus in one of the existing
> categories of device drivers. I placed it under drivers/uio, mainly because it
> shares the spirit of a generic driver allowing userspace programs to talk
> directly with hardware. Unlike the classic UIO devices, Xillybus' char files
> shouldn't be memory mapped, but rather used in the regular manner as streams
> of data.

In that case it simply isn't a UIO device.

> This driver was previously posted under drivers/misc/. The misc device
> framework turned out to be inadequate, as the driver may create more than 100
> device files in some cases.

And that is a problem? If yes, try something else like sysfs. From your
description, this is a drivers/misc device for me.


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