linux-kernel - Re: [PATCH v2] arch/tile: add hypervisor-based character driver for SPI flash ROM

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Date:	Sun, 29 May 2011 21:47:45 +0800
From:	Greg KH <gregkh@...e.de>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Eric Biederman <ebiederm@...stanetworks.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Benjamin Thery <benjamin.thery@...l.net>,
	Phil Carmody <ext-phil.2.carmody@...ia.com>
Subject: Re: [PATCH v2] arch/tile: add hypervisor-based character driver for
 SPI flash ROM

On Sun, May 29, 2011 at 08:18:36AM -0400, Chris Metcalf wrote:
> >> Is there a good example of a character device that has multiple minors and
> >> also is registered with sysfs?
> > Lots of them, look all over the kernel, and in LDD3 there's even an
> > outdated example of one I think.
> 
>  I didn't actually find many drivers that have both cdev_add with count>1,
> and mention sysfs or kobj, but char/raw.c is one that looks pretty clean. 
> (I found only four others total: uio/uio.c, s390/char/vmlogrdr.c,
> staging/comedi/comedi_fops.c, and staging/vme/devices/vme_user.c.)

No, you don't need "raw" kobjects or sysfs at all.  Just use the
device_create() call.

Hope this helps,

greg k-h
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