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

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Message-ID: <20130520211631.GA18956@local>
Date:	Mon, 20 May 2013 23:16:31 +0200
From:	"Hans J. Koch" <hjk@...sjkoch.de>
To:	Eli Billauer <eli.billauer@...il.com>
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de,
	gregkh@...uxfoundation.org, hjk@...sjkoch.de
Subject: Re: [PATCH v4 1/2] New driver: Xillybus generic interface for FPGA
 (programmable logic)

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.

Thanks,
Hans

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