Re: [PATCH 30/47] Driver core: create devices/virtual/ tree

From: Dmitry Torokhov
Date: Tue Sep 26 2006 - 09:51:32 EST

On 9/26/06, Greg KH <greg@xxxxxxxxx> wrote:
On Tue, Sep 26, 2006 at 09:24:15AM -0400, Dmitry Torokhov wrote:
> On 9/26/06, Greg KH <greg@xxxxxxxxx> wrote:
> >From: Greg Kroah-Hartman <gregkh@xxxxxxx>
> >
> >This change creates a devices/virtual/CLASS_NAME tree for struct devices
> >that belong to a class, yet do not have a "real" struct device for a
> >parent. It automatically creates the directories on the fly as needed.
> >
> Why do you need multiple virtual devices? All parentless class devices
> could grow from a single virtual device.

They could, but it's a mess of a single directory if you do that.
Having /sys/devices/virtual/tty/ as a place for all tty virtual device
is nicer than /sys/devices/virtual/ as a single place for all of them
(mem, network, tty, misc, etc.)

You supposed to use classes for classification, and devices to
represent the tree so that would be /sys/class/tty/...

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