linux-kernel - Re: [PATCH V8 2/2] serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers

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Date:	Thu, 10 Jul 2014 16:16:37 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>,
	Stephen Warren <swarren@...dia.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Jingoo Han <jg1.han@...sung.com>, linux-kernel@...r.kernel.org,
	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	linux-serial@...r.kernel.org, yrl.pp-manager.tt@...achi.com,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Aaron Sierra <asierra@...-inc.com>, Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH V8 2/2] serial/uart/8250: Add tunable RX interrupt
 trigger I/F of FIFO buffers

On Thu, Jul 10, 2014 at 03:31:57PM +0100, One Thousand Gnomes wrote:
> > I really don't like the way that the tty core has been changed to handle
> > multiple attribute groups, as I feel tty drivers shouldn't be creating
> > "special" sysfs files, depending on what driver is bound to them.
> 
> The intent isn't that it is "special" but that it can be propogated to
> others as and when they wish to provide it.
>  
> > Usually we have handled this using tools like 'stty' and ioctls, right?
> > Surely there is an ioctl to control the interrupt level, right?  Hasn't
> > this been covered before somehow?
> 
> No, and the direction when this started was to use sysfs as we have also
> been moving all the other attributes towards sysfs and has been since
> 2012.
> 
> TTY devices do have lots of strange attributes and right now many of them
> are only programmable by using device tree and rebooting.

Ok.  Hm, there has to be a better way to do the group sysfs file
handling...

Let me work on this tomorrow and see what I can come up with.  We should
be able to use the is_visable() attribute to create/notcreate the
attribute where needed...

thanks,

greg k-h
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