linux-kernel - Re: [PATCH] char: xillybus: Add driver for XillyUSB (Xillybus variant for USB)

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Date:   Thu, 7 Jan 2021 12:39:50 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Eli Billauer <eli.billauer@...il.com>
Cc:     arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] char: xillybus: Add driver for XillyUSB (Xillybus
 variant for USB)

A: http://en.wikipedia.org/wiki/Top_post
Q: Were do I find info about this thing called top-posting?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

A: No.
Q: Should I include quotations after my reply?

http://daringfireball.net/2007/07/on_top

On Thu, Jan 07, 2021 at 01:18:05PM +0200, Eli Billauer wrote:
> Hello, Greg.
> 
> I'm afraid we're not on the same page. As mentioned in the original patch
> description, XillyUSB and the existing Xillybus variant presents a nearly
> identical API. User space programs see no difference when using one or the
> other, except for different device file names.

My point is, do NOT have different file names.  Userspace should not
care about the backing transport layer of a device.

> In that sense, it's exactly
> like tty devices. But unlike ttys, there are no ioctls or any other special
> API functions to export. Xillybus' API consists only of the basic file
> operations, which behave like you'd expect from a pipe, more or less.

Great, then do like the tty devices do and present the same device name
to userspace.

thanks,

greg k-h